xref: /frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DcTracker.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.telephony.dataconnection;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.net.LinkCapabilities;
import android.net.LinkProperties;
import android.net.NetworkConfig;
import android.net.NetworkUtils;
import android.net.ProxyProperties;
import android.net.Uri;
import android.os.AsyncResult;
import android.os.Message;
import android.os.Messenger;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.provider.Settings;
import android.provider.Telephony;
import android.telephony.CellLocation;
import android.telephony.ServiceState;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import android.text.TextUtils;
import android.util.EventLog;
import android.telephony.Rlog;

import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneBase;
import com.android.internal.telephony.DctConstants;
import com.android.internal.telephony.EventLogTags;
import com.android.internal.telephony.gsm.GSMPhone;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.RILConstants;
import com.android.internal.telephony.uicc.IccRecords;
import com.android.internal.telephony.uicc.UiccController;
import com.android.internal.util.AsyncChannel;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;

/**
 * {@hide}
 */
public final class DcTracker extends DcTrackerBase {
    protected final String LOG_TAG = "DCT";

    /**
     * Handles changes to the APN db.
     */
    private class ApnChangeObserver extends ContentObserver {
        public ApnChangeObserver () {
            super(mDataConnectionTracker);
        }

        @Override
        public void onChange(boolean selfChange) {
            sendMessage(obtainMessage(DctConstants.EVENT_APN_CHANGED));
        }
    }

    //***** Instance Variables

    private boolean mReregisterOnReconnectFailure = false;


    //***** Constants

    // Used by puppetmaster/*/radio_stress.py
    private static final String PUPPET_MASTER_RADIO_STRESS_TEST = "gsm.defaultpdpcontext.active";

    private static final int POLL_PDP_MILLIS = 5 * 1000;

    static final Uri PREFERAPN_NO_UPDATE_URI =
                        Uri.parse("content://telephony/carriers/preferapn_no_update");
    static final String APN_ID = "apn_id";

    private boolean mCanSetPreferApn = false;

    /** Watches for changes to the APN db. */
    private ApnChangeObserver mApnObserver;

    //***** Constructor

    public DcTracker(PhoneBase p) {
        super(p);
        if (DBG) log("GsmDCT.constructor");
        p.mCi.registerForAvailable (this, DctConstants.EVENT_RADIO_AVAILABLE, null);
        p.mCi.registerForOffOrNotAvailable(this, DctConstants.EVENT_RADIO_OFF_OR_NOT_AVAILABLE,
                null);
        p.mCi.registerForDataNetworkStateChanged (this, DctConstants.EVENT_DATA_STATE_CHANGED,
                null);
        p.getCallTracker().registerForVoiceCallEnded (this, DctConstants.EVENT_VOICE_CALL_ENDED,
                null);
        p.getCallTracker().registerForVoiceCallStarted (this, DctConstants.EVENT_VOICE_CALL_STARTED,
                null);
        p.getServiceStateTracker().registerForDataConnectionAttached(this,
                DctConstants.EVENT_DATA_CONNECTION_ATTACHED, null);
        p.getServiceStateTracker().registerForDataConnectionDetached(this,
                DctConstants.EVENT_DATA_CONNECTION_DETACHED, null);
        p.getServiceStateTracker().registerForRoamingOn(this, DctConstants.EVENT_ROAMING_ON, null);
        p.getServiceStateTracker().registerForRoamingOff(this, DctConstants.EVENT_ROAMING_OFF,
                null);
        p.getServiceStateTracker().registerForPsRestrictedEnabled(this,
                DctConstants.EVENT_PS_RESTRICT_ENABLED, null);
        p.getServiceStateTracker().registerForPsRestrictedDisabled(this,
                DctConstants.EVENT_PS_RESTRICT_DISABLED, null);

        mDataConnectionTracker = this;

        mApnObserver = new ApnChangeObserver();
        p.getContext().getContentResolver().registerContentObserver(
                Telephony.Carriers.CONTENT_URI, true, mApnObserver);

        initApnContextsAndDataConnection();

        for (ApnContext apnContext : mApnContexts.values()) {
            // Register the reconnect and restart actions.
            IntentFilter filter = new IntentFilter();
            filter.addAction(INTENT_RECONNECT_ALARM + '.' + apnContext.getApnType());
            filter.addAction(INTENT_RESTART_TRYSETUP_ALARM + '.' + apnContext.getApnType());
            mPhone.getContext().registerReceiver(mIntentReceiver, filter, null, mPhone);
        }

        ConnectivityManager cm = (ConnectivityManager)p.getContext().getSystemService(
                Context.CONNECTIVITY_SERVICE);
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_MMS, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_SUPL, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_DUN, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_HIPRI, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_FOTA, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_IMS, new Messenger(this));
        cm.supplyMessenger(ConnectivityManager.TYPE_MOBILE_CBS, new Messenger(this));
    }

    @Override
    public void dispose() {
        if (DBG) log("GsmDCT.dispose");
        cleanUpAllConnections(true, null);

        super.dispose();

        //Unregister for all events
        mPhone.mCi.unregisterForAvailable(this);
        mPhone.mCi.unregisterForOffOrNotAvailable(this);
        IccRecords r = mIccRecords.get();
        if (r != null) { r.unregisterForRecordsLoaded(this);}
        mPhone.mCi.unregisterForDataNetworkStateChanged(this);
        mPhone.getCallTracker().unregisterForVoiceCallEnded(this);
        mPhone.getCallTracker().unregisterForVoiceCallStarted(this);
        mPhone.getServiceStateTracker().unregisterForDataConnectionAttached(this);
        mPhone.getServiceStateTracker().unregisterForDataConnectionDetached(this);
        mPhone.getServiceStateTracker().unregisterForRoamingOn(this);
        mPhone.getServiceStateTracker().unregisterForRoamingOff(this);
        mPhone.getServiceStateTracker().unregisterForPsRestrictedEnabled(this);
        mPhone.getServiceStateTracker().unregisterForPsRestrictedDisabled(this);

        mPhone.getContext().getContentResolver().unregisterContentObserver(mApnObserver);
        mApnContexts.clear();

        destroyDataConnections();
    }

    @Override
    public boolean isApnTypeActive(String type) {
        ApnContext apnContext = mApnContexts.get(type);
        if (apnContext == null) return false;

        return (apnContext.getDcAc() != null);
    }

    @Override
    public boolean isDataPossible(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext == null) {
            return false;
        }
        boolean apnContextIsEnabled = apnContext.isEnabled();
        DctConstants.State apnContextState = apnContext.getState();
        boolean apnTypePossible = !(apnContextIsEnabled &&
                (apnContextState == DctConstants.State.FAILED));
        boolean dataAllowed = isDataAllowed();
        boolean possible = dataAllowed && apnTypePossible;

        if (VDBG) {
            log(String.format("isDataPossible(%s): possible=%b isDataAllowed=%b " +
                    "apnTypePossible=%b apnContextisEnabled=%b apnContextState()=%s",
                    apnType, possible, dataAllowed, apnTypePossible,
                    apnContextIsEnabled, apnContextState));
        }
        return possible;
    }

    @Override
    protected void finalize() {
        if(DBG) log("finalize");
    }

    private ApnContext addApnContext(String type) {
        ApnContext apnContext = new ApnContext(type, LOG_TAG);
        apnContext.setDependencyMet(false);
        mApnContexts.put(type, apnContext);
        return apnContext;
    }

    protected void initApnContextsAndDataConnection() {
        boolean defaultEnabled = SystemProperties.getBoolean(DEFALUT_DATA_ON_BOOT_PROP, true);
        // Load device network attributes from resources
        String[] networkConfigStrings = mPhone.getContext().getResources().getStringArray(
                com.android.internal.R.array.networkAttributes);
        for (String networkConfigString : networkConfigStrings) {
            NetworkConfig networkConfig = new NetworkConfig(networkConfigString);
            ApnContext apnContext = null;

            switch (networkConfig.type) {
            case ConnectivityManager.TYPE_MOBILE:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_DEFAULT);
                apnContext.setEnabled(defaultEnabled);
                break;
            case ConnectivityManager.TYPE_MOBILE_MMS:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_MMS);
                break;
            case ConnectivityManager.TYPE_MOBILE_SUPL:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_SUPL);
                break;
            case ConnectivityManager.TYPE_MOBILE_DUN:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_DUN);
                break;
            case ConnectivityManager.TYPE_MOBILE_HIPRI:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_HIPRI);
                ApnContext defaultContext = mApnContexts.get(PhoneConstants.APN_TYPE_DEFAULT);
                if (defaultContext != null) {
                    applyNewState(apnContext, apnContext.isEnabled(),
                            defaultContext.getDependencyMet());
                } else {
                    // the default will set the hipri dep-met when it is created
                }
                continue;
            case ConnectivityManager.TYPE_MOBILE_FOTA:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_FOTA);
                break;
            case ConnectivityManager.TYPE_MOBILE_IMS:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_IMS);
                break;
            case ConnectivityManager.TYPE_MOBILE_CBS:
                apnContext = addApnContext(PhoneConstants.APN_TYPE_CBS);
                break;
            default:
                // skip unknown types
                continue;
            }
            if (apnContext != null) {
                // set the prop, but also apply the newly set enabled and dependency values
                onSetDependencyMet(apnContext.getApnType(), networkConfig.dependencyMet);
            }
        }
    }

    @Override
    public LinkProperties getLinkProperties(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext != null) {
            DcAsyncChannel dcac = apnContext.getDcAc();
            if (dcac != null) {
                if (DBG) log("return link properites for " + apnType);
                return dcac.getLinkPropertiesSync();
            }
        }
        if (DBG) log("return new LinkProperties");
        return new LinkProperties();
    }

    @Override
    public LinkCapabilities getLinkCapabilities(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext!=null) {
            DcAsyncChannel dataConnectionAc = apnContext.getDcAc();
            if (dataConnectionAc != null) {
                if (DBG) log("get active pdp is not null, return link Capabilities for " + apnType);
                return dataConnectionAc.getLinkCapabilitiesSync();
            }
        }
        if (DBG) log("return new LinkCapabilities");
        return new LinkCapabilities();
    }

    @Override
    // Return all active apn types
    public String[] getActiveApnTypes() {
        if (DBG) log("get all active apn types");
        ArrayList<String> result = new ArrayList<String>();

        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.isReady()) {
                result.add(apnContext.getApnType());
            }
        }

        return result.toArray(new String[0]);
    }

    @Override
    // Return active apn of specific apn type
    public String getActiveApnString(String apnType) {
        if (VDBG) log( "get active apn string for type:" + apnType);
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext != null) {
            ApnSetting apnSetting = apnContext.getApnSetting();
            if (apnSetting != null) {
                return apnSetting.apn;
            }
        }
        return null;
    }

    @Override
    public boolean isApnTypeEnabled(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext == null) {
            return false;
        }
        return apnContext.isEnabled();
    }

    @Override
    protected void setState(DctConstants.State s) {
        if (DBG) log("setState should not be used in GSM" + s);
    }

    // Return state of specific apn type
    @Override
    public DctConstants.State getState(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext != null) {
            return apnContext.getState();
        }
        return DctConstants.State.FAILED;
    }

    // Return state of overall
    @Override
    public DctConstants.State getOverallState() {
        boolean isConnecting = false;
        boolean isFailed = true; // All enabled Apns should be FAILED.
        boolean isAnyEnabled = false;

        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.isEnabled()) {
                isAnyEnabled = true;
                switch (apnContext.getState()) {
                case CONNECTED:
                case DISCONNECTING:
                    if (DBG) log("overall state is CONNECTED");
                    return DctConstants.State.CONNECTED;
                case RETRYING:
                case CONNECTING:
                    isConnecting = true;
                    isFailed = false;
                    break;
                case IDLE:
                case SCANNING:
                    isFailed = false;
                    break;
                default:
                    isAnyEnabled = true;
                    break;
                }
            }
        }

        if (!isAnyEnabled) { // Nothing enabled. return IDLE.
            if (DBG) log( "overall state is IDLE");
            return DctConstants.State.IDLE;
        }

        if (isConnecting) {
            if (DBG) log( "overall state is CONNECTING");
            return DctConstants.State.CONNECTING;
        } else if (!isFailed) {
            if (DBG) log( "overall state is IDLE");
            return DctConstants.State.IDLE;
        } else {
            if (DBG) log( "overall state is FAILED");
            return DctConstants.State.FAILED;
        }
    }

    /**
     * Ensure that we are connected to an APN of the specified type.
     *
     * @param apnType the APN type
     * @return Success is indicated by {@code PhoneConstants.APN_ALREADY_ACTIVE} or
     *         {@code PhoneConstants.APN_REQUEST_STARTED}. In the latter case, a
     *         broadcast will be sent by the ConnectivityManager when a
     *         connection to the APN has been established.
     */
    @Override
    public synchronized int enableApnType(String apnType) {
        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext == null || !isApnTypeAvailable(apnType)) {
            if (DBG) log("enableApnType: " + apnType + " is type not available");
            return PhoneConstants.APN_TYPE_NOT_AVAILABLE;
        }

        // If already active, return
        if (DBG) log("enableApnType: " + apnType + " mState(" + apnContext.getState() + ")");

        if (apnContext.getState() == DctConstants.State.CONNECTED) {
            if (DBG) log("enableApnType: return APN_ALREADY_ACTIVE");
            return PhoneConstants.APN_ALREADY_ACTIVE;
        }
        setEnabled(apnTypeToId(apnType), true);
        if (DBG) {
            log("enableApnType: new apn request for type " + apnType +
                    " return APN_REQUEST_STARTED");
        }
        return PhoneConstants.APN_REQUEST_STARTED;
    }

    @Override
    public synchronized int disableApnType(String type) {
        if (DBG) log("disableApnType:" + type);
        ApnContext apnContext = mApnContexts.get(type);

        if (apnContext != null) {
            setEnabled(apnTypeToId(type), false);
            if (apnContext.getState() != DctConstants.State.IDLE && apnContext.getState()
                    != DctConstants.State.FAILED) {
                if (DBG) log("diableApnType: return APN_REQUEST_STARTED");
                return PhoneConstants.APN_REQUEST_STARTED;
            } else {
                if (DBG) log("disableApnType: return APN_ALREADY_INACTIVE");
                return PhoneConstants.APN_ALREADY_INACTIVE;
            }

        } else {
            if (DBG) {
                log("disableApnType: no apn context was found, return APN_REQUEST_FAILED");
            }
            return PhoneConstants.APN_REQUEST_FAILED;
        }
    }

    @Override
    protected boolean isApnTypeAvailable(String type) {
        if (type.equals(PhoneConstants.APN_TYPE_DUN) && fetchDunApn() != null) {
            return true;
        }

        if (mAllApnSettings != null) {
            for (ApnSetting apn : mAllApnSettings) {
                if (apn.canHandleType(type)) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Report on whether data connectivity is enabled for any APN.
     * @return {@code false} if data connectivity has been explicitly disabled,
     * {@code true} otherwise.
     */
    @Override
    public boolean getAnyDataEnabled() {
        synchronized (mDataEnabledLock) {
            if (!(mInternalDataEnabled && mUserDataEnabled && sPolicyDataEnabled)) return false;
            for (ApnContext apnContext : mApnContexts.values()) {
                // Make sure we don't have a context that is going down
                // and is explicitly disabled.
                if (isDataAllowed(apnContext)) {
                    return true;
                }
            }
            return false;
        }
    }

    private boolean isDataAllowed(ApnContext apnContext) {
        return apnContext.isReady() && isDataAllowed();
    }

    //****** Called from ServiceStateTracker
    /**
     * Invoked when ServiceStateTracker observes a transition from GPRS
     * attach to detach.
     */
    protected void onDataConnectionDetached() {
        /*
         * We presently believe it is unnecessary to tear down the PDP context
         * when GPRS detaches, but we should stop the network polling.
         */
        if (DBG) log ("onDataConnectionDetached: stop polling and notify detached");
        stopNetStatPoll();
        stopDataStallAlarm();
        notifyDataConnection(Phone.REASON_DATA_DETACHED);
    }

    private void onDataConnectionAttached() {
        if (DBG) log("onDataConnectionAttached");
        if (getOverallState() == DctConstants.State.CONNECTED) {
            if (DBG) log("onDataConnectionAttached: start polling notify attached");
            startNetStatPoll();
            startDataStallAlarm(DATA_STALL_NOT_SUSPECTED);
            notifyDataConnection(Phone.REASON_DATA_ATTACHED);
        } else {
            // update APN availability so that APN can be enabled.
            notifyOffApnsOfAvailability(Phone.REASON_DATA_ATTACHED);
        }
        mAutoAttachOnCreation = true;
        setupDataOnConnectableApns(Phone.REASON_DATA_ATTACHED);
    }

    @Override
    protected boolean isDataAllowed() {
        final boolean internalDataEnabled;
        synchronized (mDataEnabledLock) {
            internalDataEnabled = mInternalDataEnabled;
        }

        int gprsState = mPhone.getServiceStateTracker().getCurrentDataConnectionState();
        boolean desiredPowerState = mPhone.getServiceStateTracker().getDesiredPowerState();
        IccRecords r = mIccRecords.get();
        boolean recordsLoaded = (r != null) ? r.getRecordsLoaded() : false;

        boolean allowed =
                    (gprsState == ServiceState.STATE_IN_SERVICE || mAutoAttachOnCreation) &&
                    recordsLoaded &&
                    (mPhone.getState() == PhoneConstants.State.IDLE ||
                     mPhone.getServiceStateTracker().isConcurrentVoiceAndDataAllowed()) &&
                    internalDataEnabled &&
                    (!mPhone.getServiceState().getRoaming() || getDataOnRoamingEnabled()) &&
                    !mIsPsRestricted &&
                    desiredPowerState;
        if (!allowed && DBG) {
            String reason = "";
            if (!((gprsState == ServiceState.STATE_IN_SERVICE) || mAutoAttachOnCreation)) {
                reason += " - gprs= " + gprsState;
            }
            if (!recordsLoaded) reason += " - SIM not loaded";
            if (mPhone.getState() != PhoneConstants.State.IDLE &&
                    !mPhone.getServiceStateTracker().isConcurrentVoiceAndDataAllowed()) {
                reason += " - PhoneState= " + mPhone.getState();
                reason += " - Concurrent voice and data not allowed";
            }
            if (!internalDataEnabled) reason += " - mInternalDataEnabled= false";
            if (mPhone.getServiceState().getRoaming() && !getDataOnRoamingEnabled()) {
                reason += " - Roaming and data roaming not enabled";
            }
            if (mIsPsRestricted) reason += " - mIsPsRestricted= true";
            if (!desiredPowerState) reason += " - desiredPowerState= false";
            if (DBG) log("isDataAllowed: not allowed due to" + reason);
        }
        return allowed;
    }

    private void setupDataOnConnectableApns(String reason) {
        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.getState() == DctConstants.State.FAILED) {
                apnContext.setState(DctConstants.State.IDLE);
            }
            if (apnContext.isConnectable()) {
                log("setupDataOnConnectableApns: isConnectable() call trySetupData");
                apnContext.setReason(reason);
                trySetupData(apnContext);
            }
        }
    }

    private boolean trySetupData(String reason, String type) {
        if (DBG) {
            log("trySetupData: " + type + " due to " + (reason == null ? "(unspecified)" : reason)
                    + " isPsRestricted=" + mIsPsRestricted);
        }

        if (type == null) {
            type = PhoneConstants.APN_TYPE_DEFAULT;
        }

        ApnContext apnContext = mApnContexts.get(type);

        if (apnContext == null ){
            if (DBG) log("trySetupData new apn context for type:" + type);
            apnContext = new ApnContext(type, LOG_TAG);
            mApnContexts.put(type, apnContext);
        }
        apnContext.setReason(reason);

        return trySetupData(apnContext);
    }

    private boolean trySetupData(ApnContext apnContext) {
        if (DBG) {
            log("trySetupData for type:" + apnContext.getApnType() +
                    " due to " + apnContext.getReason() + " apnContext=" + apnContext);
            log("trySetupData with mIsPsRestricted=" + mIsPsRestricted);
        }

        if (mPhone.getSimulatedRadioControl() != null) {
            // Assume data is connected on the simulator
            // FIXME  this can be improved
            apnContext.setState(DctConstants.State.CONNECTED);
            mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());

            log("trySetupData: X We're on the simulator; assuming connected retValue=true");
            return true;
        }

        boolean desiredPowerState = mPhone.getServiceStateTracker().getDesiredPowerState();

        if (apnContext.isConnectable() &&
                isDataAllowed(apnContext) && getAnyDataEnabled() && !isEmergency()) {
            if (apnContext.getState() == DctConstants.State.FAILED) {
                if (DBG) log("trySetupData: make a FAILED ApnContext IDLE so its reusable");
                apnContext.setState(DctConstants.State.IDLE);
            }
            if (apnContext.getState() == DctConstants.State.IDLE) {
                ArrayList<ApnSetting> waitingApns = buildWaitingApns(apnContext.getApnType());
                if (waitingApns.isEmpty()) {
                    notifyNoData(DcFailCause.MISSING_UNKNOWN_APN, apnContext);
                    notifyOffApnsOfAvailability(apnContext.getReason());
                    if (DBG) log("trySetupData: X No APN found retValue=false");
                    return false;
                } else {
                    apnContext.setWaitingApns(waitingApns);
                    if (DBG) {
                        log ("trySetupData: Create from mAllApnSettings : "
                                    + apnListToString(mAllApnSettings));
                    }
                }
            }

            if (DBG) {
                log("trySetupData: call setupData, waitingApns : "
                        + apnListToString(apnContext.getWaitingApns()));
            }
            boolean retValue = setupData(apnContext);
            notifyOffApnsOfAvailability(apnContext.getReason());

            if (DBG) log("trySetupData: X retValue=" + retValue);
            return retValue;
        } else {
            if (!apnContext.getApnType().equals(PhoneConstants.APN_TYPE_DEFAULT)
                    && apnContext.isConnectable()) {
                mPhone.notifyDataConnectionFailed(apnContext.getReason(), apnContext.getApnType());
            }
            notifyOffApnsOfAvailability(apnContext.getReason());
            if (DBG) log ("trySetupData: X apnContext not 'ready' retValue=false");
            return false;
        }
    }

    @Override
    // Disabled apn's still need avail/unavail notificiations - send them out
    protected void notifyOffApnsOfAvailability(String reason) {
        for (ApnContext apnContext : mApnContexts.values()) {
            if (!apnContext.isReady()) {
                if (VDBG) log("notifyOffApnOfAvailability type:" + apnContext.getApnType());
                mPhone.notifyDataConnection(reason != null ? reason : apnContext.getReason(),
                                            apnContext.getApnType(),
                                            PhoneConstants.DataState.DISCONNECTED);
            } else {
                if (VDBG) {
                    log("notifyOffApnsOfAvailability skipped apn due to isReady==true: " +
                            apnContext.toString());
                }
            }
        }
    }

    /**
     * If tearDown is true, this only tears down a CONNECTED session. Presently,
     * there is no mechanism for abandoning an CONNECTING session,
     * but would likely involve cancelling pending async requests or
     * setting a flag or new state to ignore them when they came in
     * @param tearDown true if the underlying DataConnection should be
     * disconnected.
     * @param reason reason for the clean up.
     */
    protected void cleanUpAllConnections(boolean tearDown, String reason) {
        if (DBG) log("cleanUpAllConnections: tearDown=" + tearDown + " reason=" + reason);

        for (ApnContext apnContext : mApnContexts.values()) {
            apnContext.setReason(reason);
            cleanUpConnection(tearDown, apnContext);
        }

        stopNetStatPoll();
        stopDataStallAlarm();

        // TODO: Do we need mRequestedApnType?
        mRequestedApnType = PhoneConstants.APN_TYPE_DEFAULT;
    }

    /**
     * Cleanup all connections.
     *
     * TODO: Cleanup only a specified connection passed as a parameter.
     *       Also, make sure when you clean up a conn, if it is last apply
     *       logic as though it is cleanupAllConnections
     *
     * @param cause for the clean up.
     */

    @Override
    protected void onCleanUpAllConnections(String cause) {
        cleanUpAllConnections(true, cause);
    }

    private void cleanUpConnection(boolean tearDown, ApnContext apnContext) {

        if (apnContext == null) {
            if (DBG) log("cleanUpConnection: apn context is null");
            return;
        }

        DcAsyncChannel dcac = apnContext.getDcAc();
        if (DBG) {
            log("cleanUpConnection: E tearDown=" + tearDown + " reason=" + apnContext.getReason() +
                    " apnContext=" + apnContext);
        }
        if (tearDown) {
            if (apnContext.isDisconnected()) {
                // The request is tearDown and but ApnContext is not connected.
                // If apnContext is not enabled anymore, break the linkage to the DCAC/DC.
                apnContext.setState(DctConstants.State.IDLE);
                if (!apnContext.isReady()) {
                    if (dcac != null) {
                        dcac.tearDown(apnContext, "", null);
                    }
                    apnContext.setDataConnectionAc(null);
                }
            } else {
                // Connection is still there. Try to clean up.
                if (dcac != null) {
                    if (apnContext.getState() != DctConstants.State.DISCONNECTING) {
                        boolean disconnectAll = false;
                        if (PhoneConstants.APN_TYPE_DUN.equals(apnContext.getApnType())) {
                            ApnSetting dunSetting = fetchDunApn();
                            if (dunSetting != null &&
                                    dunSetting.equals(apnContext.getApnSetting())) {
                                if (DBG) log("tearing down dedicated DUN connection");
                                // we need to tear it down - we brought it up just for dun and
                                // other people are camped on it and now dun is done.  We need
                                // to stop using it and let the normal apn list get used to find
                                // connections for the remaining desired connections
                                disconnectAll = true;
                            }
                        }
                        if (DBG) {
                            log("cleanUpConnection: tearing down" + (disconnectAll ? " all" :""));
                        }
                        Message msg = obtainMessage(DctConstants.EVENT_DISCONNECT_DONE, apnContext);
                        if (disconnectAll) {
                            apnContext.getDcAc().tearDownAll(apnContext.getReason(), msg);
                        } else {
                            apnContext.getDcAc()
                                .tearDown(apnContext, apnContext.getReason(), msg);
                        }
                        apnContext.setState(DctConstants.State.DISCONNECTING);
                    }
                } else {
                    // apn is connected but no reference to dcac.
                    // Should not be happen, but reset the state in case.
                    apnContext.setState(DctConstants.State.IDLE);
                    mPhone.notifyDataConnection(apnContext.getReason(),
                                                apnContext.getApnType());
                }
            }
        } else {
            // force clean up the data connection.
            if (dcac != null) dcac.reqReset();
            apnContext.setState(DctConstants.State.IDLE);
            mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());
            apnContext.setDataConnectionAc(null);
        }

        // Make sure reconnection alarm is cleaned up if there is no ApnContext
        // associated to the connection.
        if (dcac != null) {
            cancelReconnectAlarm(apnContext);
        }
        if (DBG) {
            log("cleanUpConnection: X tearDown=" + tearDown + " reason=" + apnContext.getReason() +
                    " apnContext=" + apnContext + " dcac=" + apnContext.getDcAc());
        }
    }

    /**
     * Cancels the alarm associated with apnContext.
     *
     * @param apnContext on which the alarm should be stopped.
     */
    private void cancelReconnectAlarm(ApnContext apnContext) {
        if (apnContext == null) return;

        PendingIntent intent = apnContext.getReconnectIntent();

        if (intent != null) {
                AlarmManager am =
                    (AlarmManager) mPhone.getContext().getSystemService(Context.ALARM_SERVICE);
                am.cancel(intent);
                apnContext.setReconnectIntent(null);
        }
    }

    /**
     * @param types comma delimited list of APN types
     * @return array of APN types
     */
    private String[] parseTypes(String types) {
        String[] result;
        // If unset, set to DEFAULT.
        if (types == null || types.equals("")) {
            result = new String[1];
            result[0] = PhoneConstants.APN_TYPE_ALL;
        } else {
            result = types.split(",");
        }
        return result;
    }

   private boolean imsiMatches(String imsiDB, String imsiSIM) {
        // Note: imsiDB value has digit number or 'x' character for seperating USIM information
        // for MVNO operator. And then digit number is matched at same order and 'x' character
        // could replace by any digit number.
        // ex) if imsiDB inserted '310260x10xxxxxx' for GG Operator,
        //     that means first 6 digits, 8th and 9th digit
        //     should be set in USIM for GG Operator.
        int len = imsiDB.length();
        int idxCompare = 0;

        if (len <= 0) return false;
        if (len > imsiSIM.length()) return false;

        for (int idx=0; idx<len; idx++) {
            char c = imsiDB.charAt(idx);
            if ((c == 'x') || (c == 'X') || (c == imsiSIM.charAt(idx))) {
                continue;
            } else {
                return false;
            }
        }
        return true;
    }

    private boolean mvnoMatches(IccRecords r, String mvno_type, String mvno_match_data) {
        if (mvno_type.equalsIgnoreCase("spn")) {
            if ((r.getServiceProviderName() != null) &&
                    r.getServiceProviderName().equalsIgnoreCase(mvno_match_data)) {
                return true;
            }
        } else if (mvno_type.equalsIgnoreCase("imsi")) {
            String imsiSIM = r.getIMSI();
            if ((imsiSIM != null) && imsiMatches(mvno_match_data, imsiSIM)) {
                return true;
            }
        } else if (mvno_type.equalsIgnoreCase("gid")) {
            String gid1 = r.getGid1();
            if ((gid1 != null) && gid1.substring(0,
                    mvno_match_data.length()).equalsIgnoreCase(mvno_match_data)) {
                return true;
            }
        }
        return false;
    }

    private ApnSetting makeApnSetting(Cursor cursor) {
        String[] types = parseTypes(
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.TYPE)));
        ApnSetting apn = new ApnSetting(
                cursor.getInt(cursor.getColumnIndexOrThrow(Telephony.Carriers._ID)),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.NUMERIC)),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.NAME)),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.APN)),
                NetworkUtils.trimV4AddrZeros(
                        cursor.getString(
                        cursor.getColumnIndexOrThrow(Telephony.Carriers.PROXY))),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.PORT)),
                NetworkUtils.trimV4AddrZeros(
                        cursor.getString(
                        cursor.getColumnIndexOrThrow(Telephony.Carriers.MMSC))),
                NetworkUtils.trimV4AddrZeros(
                        cursor.getString(
                        cursor.getColumnIndexOrThrow(Telephony.Carriers.MMSPROXY))),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.MMSPORT)),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.USER)),
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.PASSWORD)),
                cursor.getInt(cursor.getColumnIndexOrThrow(Telephony.Carriers.AUTH_TYPE)),
                types,
                cursor.getString(cursor.getColumnIndexOrThrow(Telephony.Carriers.PROTOCOL)),
                cursor.getString(cursor.getColumnIndexOrThrow(
                        Telephony.Carriers.ROAMING_PROTOCOL)),
                cursor.getInt(cursor.getColumnIndexOrThrow(
                        Telephony.Carriers.CARRIER_ENABLED)) == 1,
                cursor.getInt(cursor.getColumnIndexOrThrow(Telephony.Carriers.BEARER)));
        return apn;
    }

    private ArrayList<ApnSetting> createApnList(Cursor cursor) {
        ArrayList<ApnSetting> result = new ArrayList<ApnSetting>();
        IccRecords r = mIccRecords.get();

        if (cursor.moveToFirst()) {
            String mvnoType = null;
            String mvnoMatchData = null;
            do {
                String cursorMvnoType = cursor.getString(
                        cursor.getColumnIndexOrThrow(Telephony.Carriers.MVNO_TYPE));
                String cursorMvnoMatchData = cursor.getString(
                        cursor.getColumnIndexOrThrow(Telephony.Carriers.MVNO_MATCH_DATA));
                if (mvnoType != null) {
                    if (mvnoType.equals(cursorMvnoType) &&
                            mvnoMatchData.equals(cursorMvnoMatchData)) {
                        result.add(makeApnSetting(cursor));
                    }
                } else {
                    // no mvno match yet
                    if (mvnoMatches(r, cursorMvnoType, cursorMvnoMatchData)) {
                        // first match - toss out non-mvno data
                        result.clear();
                        mvnoType = cursorMvnoType;
                        mvnoMatchData = cursorMvnoMatchData;
                        result.add(makeApnSetting(cursor));
                    } else {
                        // add only non-mvno data
                        if (cursorMvnoType.equals("")) {
                            result.add(makeApnSetting(cursor));
                        }
                    }
                }
            } while (cursor.moveToNext());
        }
        if (DBG) log("createApnList: X result=" + result);
        return result;
    }

    private boolean dataConnectionNotInUse(DcAsyncChannel dcac) {
        if (DBG) log("dataConnectionNotInUse: check if dcac is inuse dcac=" + dcac);
        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.getDcAc() == dcac) {
                if (DBG) log("dataConnectionNotInUse: in use by apnContext=" + apnContext);
                return false;
            }
        }
        // TODO: Fix retry handling so free DataConnections have empty apnlists.
        // Probably move retry handling into DataConnections and reduce complexity
        // of DCT.
        if (DBG) log("dataConnectionNotInUse: tearDownAll");
        dcac.tearDownAll("No connection", null);
        if (DBG) log("dataConnectionNotInUse: not in use return true");
        return true;
    }

    private DcAsyncChannel findFreeDataConnection() {
        for (DcAsyncChannel dcac : mDataConnectionAcHashMap.values()) {
            if (dcac.isInactiveSync() && dataConnectionNotInUse(dcac)) {
                if (DBG) {
                    log("findFreeDataConnection: found free DataConnection=" +
                        " dcac=" + dcac);
                }
                return dcac;
            }
        }
        log("findFreeDataConnection: NO free DataConnection");
        return null;
    }

    private boolean setupData(ApnContext apnContext) {
        if (DBG) log("setupData: apnContext=" + apnContext);
        ApnSetting apnSetting;
        DcAsyncChannel dcac;

        int profileId = getApnProfileID(apnContext.getApnType());
        apnSetting = apnContext.getNextWaitingApn();
        if (apnSetting == null) {
            if (DBG) log("setupData: return for no apn found!");
            return false;
        }

        dcac = checkForCompatibleConnectedApnContext(apnContext);
        if (dcac != null) {
            // Get the dcacApnSetting for the connection we want to share.
            ApnSetting dcacApnSetting = dcac.getApnSettingSync();
            if (dcacApnSetting != null) {
                // Setting is good, so use it.
                apnSetting = dcacApnSetting;
            }
        }
        if (dcac == null) {
            dcac = findFreeDataConnection();

            if (dcac == null) {
                dcac = createDataConnection();
            }

            if (dcac == null) {
                if (DBG) log("setupData: No free DataConnection and couldn't create one, WEIRD");
                return false;
            }
        }
        if (DBG) log("setupData: dcac=" + dcac + " apnSetting=" + apnSetting);

        apnContext.setDataConnectionAc(dcac);
        apnContext.setApnSetting(apnSetting);
        apnContext.setState(DctConstants.State.CONNECTING);
        mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());

        Message msg = obtainMessage();
        msg.what = DctConstants.EVENT_DATA_SETUP_COMPLETE;
        msg.obj = apnContext;
        dcac.bringUp(apnContext, getInitialMaxRetry(), profileId, msg);

        if (DBG) log("setupData: initing!");
        return true;
    }

    /**
     * Handles changes to the APN database.
     */
    private void onApnChanged() {
        DctConstants.State overallState = getOverallState();
        boolean isDisconnected = (overallState == DctConstants.State.IDLE ||
                overallState == DctConstants.State.FAILED);

        if (mPhone instanceof GSMPhone) {
            // The "current" may no longer be valid.  MMS depends on this to send properly. TBD
            ((GSMPhone)mPhone).updateCurrentCarrierInProvider();
        }

        // TODO: It'd be nice to only do this if the changed entrie(s)
        // match the current operator.
        if (DBG) log("onApnChanged: createAllApnList and cleanUpAllConnections");
        createAllApnList();
        cleanUpAllConnections(!isDisconnected, Phone.REASON_APN_CHANGED);
        if (isDisconnected) {
            setupDataOnConnectableApns(Phone.REASON_APN_CHANGED);
        }
    }

    /**
     * @param cid Connection id provided from RIL.
     * @return DataConnectionAc associated with specified cid.
     */
    private DcAsyncChannel findDataConnectionAcByCid(int cid) {
        for (DcAsyncChannel dcac : mDataConnectionAcHashMap.values()) {
            if (dcac.getCidSync() == cid) {
                return dcac;
            }
        }
        return null;
    }

    /**
     * @param ar is the result of RIL_REQUEST_DATA_CALL_LIST
     * or RIL_UNSOL_DATA_CALL_LIST_CHANGED
     */
    private void onDataStateChanged (AsyncResult ar) {
        ArrayList<DataCallResponse> dataCallStates;

        if (DBG) log("onDataStateChanged(ar): E");
        dataCallStates = (ArrayList<DataCallResponse>)(ar.result);

        if (ar.exception != null) {
            // This is probably "radio not available" or something
            // of that sort. If so, the whole connection is going
            // to come down soon anyway
            if (DBG) log("onDataStateChanged(ar): exception; likely radio not available, ignore");
            return;
        }
        if (DBG) log("onDataStateChanged(ar): DataCallResponse size=" + dataCallStates.size());

        // Create a hash map to store the dataCallState of each DataConnectionAc
        HashMap<DataCallResponse, DcAsyncChannel> dataCallStateToDcac;
        dataCallStateToDcac = new HashMap<DataCallResponse, DcAsyncChannel>();
        for (DataCallResponse dataCallState : dataCallStates) {
            DcAsyncChannel dcac = findDataConnectionAcByCid(dataCallState.cid);

            if (dcac != null) dataCallStateToDcac.put(dataCallState, dcac);
        }

        // Check if we should start or stop polling, by looking
        // for dormant and active connections.
        boolean isAnyDataCallDormant = false;
        boolean isAnyDataCallActive = false;
        for (DataCallResponse newState : dataCallStates) {
            if (newState.active == DATA_CONNECTION_ACTIVE_PH_LINK_UP) isAnyDataCallActive = true;
            if (newState.active == DATA_CONNECTION_ACTIVE_PH_LINK_DOWN) isAnyDataCallDormant = true;
        }

        if (isAnyDataCallDormant && !isAnyDataCallActive) {
            // There is no way to indicate link activity per APN right now. So
            // Link Activity will be considered dormant only when all data calls
            // are dormant.
            // If a single data call is in dormant state and none of the data
            // calls are active broadcast overall link state as dormant.
            mActivity = DctConstants.Activity.DORMANT;
            if (DBG) {
                log("onDataStateChanged: Data Activity updated to DORMANT. stopNetStatePoll");
            }
            stopNetStatPoll();
        } else {
            mActivity = DctConstants.Activity.NONE;
            if (DBG) {
                log("onDataStateChanged: Data Activity updated to NONE. " +
                         "isAnyDataCallActive = " + isAnyDataCallActive +
                         " isAnyDataCallDormant = " + isAnyDataCallDormant);
            }
            if (isAnyDataCallActive) startNetStatPoll();
        }

        if (DBG) log("onDataStateChanged(ar): X");
    }

    private void notifyDefaultData(ApnContext apnContext) {
        if (DBG) {
            log("notifyDefaultData: type=" + apnContext.getApnType()
                + ", reason:" + apnContext.getReason());
        }
        apnContext.setState(DctConstants.State.CONNECTED);
        // setState(DctConstants.State.CONNECTED);
        mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());
        startNetStatPoll();
        startDataStallAlarm(DATA_STALL_NOT_SUSPECTED);
    }

    // TODO: For multiple Active APNs not exactly sure how to do this.
    @Override
    protected void gotoIdleAndNotifyDataConnection(String reason) {
        if (DBG) log("gotoIdleAndNotifyDataConnection: reason=" + reason);
        notifyDataConnection(reason);
        mActiveApn = null;
    }

    @Override
    protected void restartRadio() {
        if (DBG) log("restartRadio: ************TURN OFF RADIO**************");
        cleanUpAllConnections(true, Phone.REASON_RADIO_TURNED_OFF);
        mPhone.getServiceStateTracker().powerOffRadioSafely(this);
        /* Note: no need to call setRadioPower(true).  Assuming the desired
         * radio power state is still ON (as tracked by ServiceStateTracker),
         * ServiceStateTracker will call setRadioPower when it receives the
         * RADIO_STATE_CHANGED notification for the power off.  And if the
         * desired power state has changed in the interim, we don't want to
         * override it with an unconditional power on.
         */

        int reset = Integer.parseInt(SystemProperties.get("net.ppp.reset-by-timeout", "0"));
        SystemProperties.set("net.ppp.reset-by-timeout", String.valueOf(reset+1));
    }

    /**
     * Return true if data connection need to be setup after disconnected due to
     * reason.
     *
     * @param reason the reason why data is disconnected
     * @return true if try setup data connection is need for this reason
     */
    private boolean retryAfterDisconnected(String reason) {
        boolean retry = true;

        if ( Phone.REASON_RADIO_TURNED_OFF.equals(reason) ) {
            retry = false;
        }
        return retry;
    }

    private void startAlarmForReconnect(int delay, ApnContext apnContext) {
        String apnType = apnContext.getApnType();

        Intent intent = new Intent(INTENT_RECONNECT_ALARM + "." + apnType);
        intent.putExtra(INTENT_RECONNECT_ALARM_EXTRA_REASON, apnContext.getReason());
        intent.putExtra(INTENT_RECONNECT_ALARM_EXTRA_TYPE, apnType);

        if (DBG) {
            log("startAlarmForReconnect: delay=" + delay + " action=" + intent.getAction()
                    + " apn=" + apnContext);
        }

        PendingIntent alarmIntent = PendingIntent.getBroadcast (mPhone.getContext(), 0,
                                        intent, PendingIntent.FLAG_UPDATE_CURRENT);
        apnContext.setReconnectIntent(alarmIntent);
        mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                SystemClock.elapsedRealtime() + delay, alarmIntent);
    }

    private void startAlarmForRestartTrySetup(int delay, ApnContext apnContext) {
        String apnType = apnContext.getApnType();
        Intent intent = new Intent(INTENT_RESTART_TRYSETUP_ALARM + "." + apnType);
        intent.putExtra(INTENT_RESTART_TRYSETUP_ALARM_EXTRA_TYPE, apnType);

        if (DBG) {
            log("startAlarmForRestartTrySetup: delay=" + delay + " action=" + intent.getAction()
                    + " apn=" + apnContext);
        }
        PendingIntent alarmIntent = PendingIntent.getBroadcast (mPhone.getContext(), 0,
                                        intent, PendingIntent.FLAG_UPDATE_CURRENT);
        apnContext.setReconnectIntent(alarmIntent);
        mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                SystemClock.elapsedRealtime() + delay, alarmIntent);
    }

    private void notifyNoData(DcFailCause lastFailCauseCode,
                              ApnContext apnContext) {
        if (DBG) log( "notifyNoData: type=" + apnContext.getApnType());
        if (lastFailCauseCode.isPermanentFail()
            && (!apnContext.getApnType().equals(PhoneConstants.APN_TYPE_DEFAULT))) {
            mPhone.notifyDataConnectionFailed(apnContext.getReason(), apnContext.getApnType());
        }
    }

    private void onRecordsLoaded() {
        if (DBG) log("onRecordsLoaded: createAllApnList");
        createAllApnList();
        if (mPhone.mCi.getRadioState().isOn()) {
            if (DBG) log("onRecordsLoaded: notifying data availability");
            notifyOffApnsOfAvailability(Phone.REASON_SIM_LOADED);
        }
        setupDataOnConnectableApns(Phone.REASON_SIM_LOADED);
    }

    @Override
    protected void onSetDependencyMet(String apnType, boolean met) {
        // don't allow users to tweak hipri to work around default dependency not met
        if (PhoneConstants.APN_TYPE_HIPRI.equals(apnType)) return;

        ApnContext apnContext = mApnContexts.get(apnType);
        if (apnContext == null) {
            loge("onSetDependencyMet: ApnContext not found in onSetDependencyMet(" +
                    apnType + ", " + met + ")");
            return;
        }
        applyNewState(apnContext, apnContext.isEnabled(), met);
        if (PhoneConstants.APN_TYPE_DEFAULT.equals(apnType)) {
            // tie actions on default to similar actions on HIPRI regarding dependencyMet
            apnContext = mApnContexts.get(PhoneConstants.APN_TYPE_HIPRI);
            if (apnContext != null) applyNewState(apnContext, apnContext.isEnabled(), met);
        }
    }

    private void applyNewState(ApnContext apnContext, boolean enabled, boolean met) {
        boolean cleanup = false;
        boolean trySetup = false;
        if (DBG) {
            log("applyNewState(" + apnContext.getApnType() + ", " + enabled +
                    "(" + apnContext.isEnabled() + "), " + met + "(" +
                    apnContext.getDependencyMet() +"))");
        }
        if (apnContext.isReady()) {
            if (enabled && met) {
                DctConstants.State state = apnContext.getState();
                switch(state) {
                    case CONNECTING:
                    case SCANNING:
                    case CONNECTED:
                    case DISCONNECTING:
                        // We're "READY" and active so just return
                        if (DBG) log("applyNewState: 'ready' so return");
                        return;
                    case IDLE:
                        // fall through: this is unexpected but if it happens cleanup and try setup
                    case FAILED:
                    case RETRYING: {
                        // We're "READY" but not active so disconnect (cleanup = true) and
                        // connect (trySetup = true) to be sure we retry the connection.
                        trySetup = true;
                        apnContext.setReason(Phone.REASON_DATA_ENABLED);
                        break;
                    }
                }
            } else if (!enabled) {
                apnContext.setReason(Phone.REASON_DATA_DISABLED);
            } else {
                apnContext.setReason(Phone.REASON_DATA_DEPENDENCY_UNMET);
            }
            cleanup = true;
        } else {
            if (enabled && met) {
                if (apnContext.isEnabled()) {
                    apnContext.setReason(Phone.REASON_DATA_DEPENDENCY_MET);
                } else {
                    apnContext.setReason(Phone.REASON_DATA_ENABLED);
                }
                if (apnContext.getState() == DctConstants.State.FAILED) {
                    apnContext.setState(DctConstants.State.IDLE);
                }
                trySetup = true;
            }
        }
        apnContext.setEnabled(enabled);
        apnContext.setDependencyMet(met);
        if (cleanup) cleanUpConnection(true, apnContext);
        if (trySetup) trySetupData(apnContext);
    }

    private DcAsyncChannel checkForCompatibleConnectedApnContext(ApnContext apnContext) {
        String apnType = apnContext.getApnType();
        ApnSetting dunSetting = null;

        if (PhoneConstants.APN_TYPE_DUN.equals(apnType)) {
            dunSetting = fetchDunApn();
        }
        if (DBG) {
            log("checkForCompatibleConnectedApnContext: apnContext=" + apnContext );
        }

        DcAsyncChannel potentialDcac = null;
        ApnContext potentialApnCtx = null;
        for (ApnContext curApnCtx : mApnContexts.values()) {
            DcAsyncChannel curDcac = curApnCtx.getDcAc();
            if (curDcac != null) {
                ApnSetting apnSetting = curApnCtx.getApnSetting();
                if (dunSetting != null) {
                    if (dunSetting.equals(apnSetting)) {
                        switch (curApnCtx.getState()) {
                            case CONNECTED:
                                if (DBG) {
                                    log("checkForCompatibleConnectedApnContext:"
                                            + " found dun conn=" + curDcac
                                            + " curApnCtx=" + curApnCtx);
                                }
                                return curDcac;
                            case RETRYING:
                            case CONNECTING:
                                potentialDcac = curDcac;
                                potentialApnCtx = curApnCtx;
                            default:
                                // Not connected, potential unchanged
                                break;
                        }
                    }
                } else if (apnSetting != null && apnSetting.canHandleType(apnType)) {
                    switch (curApnCtx.getState()) {
                        case CONNECTED:
                            if (DBG) {
                                log("checkForCompatibleConnectedApnContext:"
                                        + " found canHandle conn=" + curDcac
                                        + " curApnCtx=" + curApnCtx);
                            }
                            return curDcac;
                        case RETRYING:
                        case CONNECTING:
                            potentialDcac = curDcac;
                            potentialApnCtx = curApnCtx;
                        default:
                            // Not connected, potential unchanged
                            break;
                    }
                }
            } else {
                if (VDBG) {
                    log("checkForCompatibleConnectedApnContext: not conn curApnCtx=" + curApnCtx);
                }
            }
        }
        if (potentialDcac != null) {
            if (DBG) {
                log("checkForCompatibleConnectedApnContext: found potential conn=" + potentialDcac
                        + " curApnCtx=" + potentialApnCtx);
            }
            return potentialDcac;
        }

        if (DBG) log("checkForCompatibleConnectedApnContext: NO conn apnContext=" + apnContext);
        return null;
    }

    @Override
    protected void onEnableApn(int apnId, int enabled) {
        ApnContext apnContext = mApnContexts.get(apnIdToType(apnId));
        if (apnContext == null) {
            loge("onEnableApn(" + apnId + ", " + enabled + "): NO ApnContext");
            return;
        }
        // TODO change our retry manager to use the appropriate numbers for the new APN
        if (DBG) log("onEnableApn: apnContext=" + apnContext + " call applyNewState");
        applyNewState(apnContext, enabled == DctConstants.ENABLED, apnContext.getDependencyMet());
    }

    @Override
    // TODO: We shouldnt need this.
    protected boolean onTrySetupData(String reason) {
        if (DBG) log("onTrySetupData: reason=" + reason);
        setupDataOnConnectableApns(reason);
        return true;
    }

    protected boolean onTrySetupData(ApnContext apnContext) {
        if (DBG) log("onTrySetupData: apnContext=" + apnContext);
        return trySetupData(apnContext);
    }

    @Override
    protected void onRoamingOff() {
        if (DBG) log("onRoamingOff");

        if (mUserDataEnabled == false) return;

        if (getDataOnRoamingEnabled() == false) {
            notifyOffApnsOfAvailability(Phone.REASON_ROAMING_OFF);
            setupDataOnConnectableApns(Phone.REASON_ROAMING_OFF);
        } else {
            notifyDataConnection(Phone.REASON_ROAMING_OFF);
        }
    }

    @Override
    protected void onRoamingOn() {
        if (mUserDataEnabled == false) return;

        if (getDataOnRoamingEnabled()) {
            if (DBG) log("onRoamingOn: setup data on roaming");
            setupDataOnConnectableApns(Phone.REASON_ROAMING_ON);
            notifyDataConnection(Phone.REASON_ROAMING_ON);
        } else {
            if (DBG) log("onRoamingOn: Tear down data connection on roaming.");
            cleanUpAllConnections(true, Phone.REASON_ROAMING_ON);
            notifyOffApnsOfAvailability(Phone.REASON_ROAMING_ON);
        }
    }

    @Override
    protected void onRadioAvailable() {
        if (DBG) log("onRadioAvailable");
        if (mPhone.getSimulatedRadioControl() != null) {
            // Assume data is connected on the simulator
            // FIXME  this can be improved
            // setState(DctConstants.State.CONNECTED);
            notifyDataConnection(null);

            log("onRadioAvailable: We're on the simulator; assuming data is connected");
        }

        IccRecords r = mIccRecords.get();
        if (r != null && r.getRecordsLoaded()) {
            notifyOffApnsOfAvailability(null);
        }

        if (getOverallState() != DctConstants.State.IDLE) {
            cleanUpConnection(true, null);
        }
    }

    @Override
    protected void onRadioOffOrNotAvailable() {
        // Make sure our reconnect delay starts at the initial value
        // next time the radio comes on

        mReregisterOnReconnectFailure = false;

        if (mPhone.getSimulatedRadioControl() != null) {
            // Assume data is connected on the simulator
            // FIXME  this can be improved
            log("We're on the simulator; assuming radio off is meaningless");
        } else {
            if (DBG) log("onRadioOffOrNotAvailable: is off and clean up all connections");
            cleanUpAllConnections(false, Phone.REASON_RADIO_TURNED_OFF);
        }
        notifyOffApnsOfAvailability(null);
    }

    /**
     * A SETUP (aka bringUp) has completed, possibly with an error. If
     * there is an error this method will call {@link #onDataSetupCompleteError}.
     */
    @Override
    protected void onDataSetupComplete(AsyncResult ar) {

        DcFailCause cause = DcFailCause.UNKNOWN;
        boolean handleError = false;
        ApnContext apnContext = null;

        if(ar.userObj instanceof ApnContext){
            apnContext = (ApnContext)ar.userObj;
        } else {
            throw new RuntimeException("onDataSetupComplete: No apnContext");
        }

        if (ar.exception == null) {
            DcAsyncChannel dcac = apnContext.getDcAc();

            if (RADIO_TESTS) {
                // Note: To change radio.test.onDSC.null.dcac from command line you need to
                // adb root and adb remount and from the command line you can only change the
                // value to 1 once. To change it a second time you can reboot or execute
                // adb shell stop and then adb shell start. The command line to set the value is:
                // adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "insert into system (name,value) values ('radio.test.onDSC.null.dcac', '1');"
                ContentResolver cr = mPhone.getContext().getContentResolver();
                String radioTestProperty = "radio.test.onDSC.null.dcac";
                if (Settings.System.getInt(cr, radioTestProperty, 0) == 1) {
                    log("onDataSetupComplete: " + radioTestProperty +
                            " is true, set dcac to null and reset property to false");
                    dcac = null;
                    Settings.System.putInt(cr, radioTestProperty, 0);
                    log("onDataSetupComplete: " + radioTestProperty + "=" +
                            Settings.System.getInt(mPhone.getContext().getContentResolver(),
                                    radioTestProperty, -1));
                }
            }
            if (dcac == null) {
                log("onDataSetupComplete: no connection to DC, handle as error");
                cause = DcFailCause.CONNECTION_TO_DATACONNECTIONAC_BROKEN;
                handleError = true;
            } else {
                ApnSetting apn = apnContext.getApnSetting();
                if (DBG) {
                    log("onDataSetupComplete: success apn=" + (apn == null ? "unknown" : apn.apn));
                }
                if (apn != null && apn.proxy != null && apn.proxy.length() != 0) {
                    try {
                        String port = apn.port;
                        if (TextUtils.isEmpty(port)) port = "8080";
                        ProxyProperties proxy = new ProxyProperties(apn.proxy,
                                Integer.parseInt(port), null);
                        dcac.setLinkPropertiesHttpProxySync(proxy);
                    } catch (NumberFormatException e) {
                        loge("onDataSetupComplete: NumberFormatException making ProxyProperties (" +
                                apn.port + "): " + e);
                    }
                }

                // everything is setup
                if(TextUtils.equals(apnContext.getApnType(),PhoneConstants.APN_TYPE_DEFAULT)) {
                    SystemProperties.set(PUPPET_MASTER_RADIO_STRESS_TEST, "true");
                    if (mCanSetPreferApn && mPreferredApn == null) {
                        if (DBG) log("onDataSetupComplete: PREFERED APN is null");
                        mPreferredApn = apn;
                        if (mPreferredApn != null) {
                            setPreferredApn(mPreferredApn.id);
                        }
                    }
                } else {
                    SystemProperties.set(PUPPET_MASTER_RADIO_STRESS_TEST, "false");
                }
                notifyDefaultData(apnContext);
            }
        } else {
            cause = (DcFailCause) (ar.result);
            if (DBG) {
                ApnSetting apn = apnContext.getApnSetting();
                log(String.format("onDataSetupComplete: error apn=%s cause=%s",
                        (apn == null ? "unknown" : apn.apn), cause));
            }
            if (cause.isEventLoggable()) {
                // Log this failure to the Event Logs.
                int cid = getCellLocationId();
                EventLog.writeEvent(EventLogTags.PDP_SETUP_FAIL,
                        cause.ordinal(), cid, TelephonyManager.getDefault().getNetworkType());
            }

            // Count permanent failures and remove the APN we just tried
            if (cause.isPermanentFail()) apnContext.decWaitingApnsPermFailCount();

            apnContext.removeWaitingApn(apnContext.getApnSetting());
            if (DBG) {
                log(String.format("onDataSetupComplete: WaitingApns.size=%d" +
                        " WaitingApnsPermFailureCountDown=%d",
                        apnContext.getWaitingApns().size(),
                        apnContext.getWaitingApnsPermFailCount()));
            }
            handleError = true;
        }

        if (handleError) {
            onDataSetupCompleteError(ar);
        }
    }

    /**
     * @return number of milli-seconds to delay between trying apns'
     */
    private int getApnDelay() {
        if (mFailFast) {
            return SystemProperties.getInt("persist.radio.apn_ff_delay",
                    APN_FAIL_FAST_DELAY_DEFAULT_MILLIS);
        } else {
            return SystemProperties.getInt("persist.radio.apn_delay", APN_DELAY_DEFAULT_MILLIS);
        }
    }

    /**
     * Error has occurred during the SETUP {aka bringUP} request and the DCT
     * should either try the next waiting APN or start over from the
     * beginning if the list is empty. Between each SETUP request there will
     * be a delay defined by {@link #getApnDelay()}.
     */
    @Override
    protected void onDataSetupCompleteError(AsyncResult ar) {
        String reason = "";
        ApnContext apnContext = null;

        if(ar.userObj instanceof ApnContext){
            apnContext = (ApnContext)ar.userObj;
        } else {
            throw new RuntimeException("onDataSetupCompleteError: No apnContext");
        }

        // See if there are more APN's to try
        if (apnContext.getWaitingApns().isEmpty()) {
            apnContext.setState(DctConstants.State.FAILED);
            mPhone.notifyDataConnection(Phone.REASON_APN_FAILED, apnContext.getApnType());

            apnContext.setDataConnectionAc(null);

            if (apnContext.getWaitingApnsPermFailCount() == 0) {
                if (DBG) {
                    log("onDataSetupComplete: All APN's had permanent failures, stop retrying");
                }
            } else {
                if (DBG) {
                    log("onDataSetupComplete: Not all APN's had permanent failures, short delay");
                }
                startAlarmForRestartTrySetup(getApnDelay(), apnContext);
            }
        } else {
            if (DBG) log("onDataSetupComplete: Try next APN");
            apnContext.setState(DctConstants.State.SCANNING);
            // Wait a bit before trying the next APN, so that
            // we're not tying up the RIL command channel
            startAlarmForReconnect(getApnDelay(), apnContext);
        }
    }

    /**
     * Called when EVENT_DISCONNECT_DONE is received.
     */
    @Override
    protected void onDisconnectDone(int connId, AsyncResult ar) {
        ApnContext apnContext = null;

        if (ar.userObj instanceof ApnContext) {
            apnContext = (ApnContext) ar.userObj;
        } else {
            loge("onDisconnectDone: Invalid ar in onDisconnectDone, ignore");
            return;
        }

        if(DBG) log("onDisconnectDone: EVENT_DISCONNECT_DONE apnContext=" + apnContext);
        apnContext.setState(DctConstants.State.IDLE);

        mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());

        // if all data connection are gone, check whether Airplane mode request was
        // pending.
        if (isDisconnected()) {
            if (mPhone.getServiceStateTracker().processPendingRadioPowerOffAfterDataOff()) {
                // Radio will be turned off. No need to retry data setup
                apnContext.setApnSetting(null);
                apnContext.setDataConnectionAc(null);
                return;
            }
        }

        // If APN is still enabled, try to bring it back up automatically
        if (apnContext.isReady() && retryAfterDisconnected(apnContext.getReason())) {
            SystemProperties.set(PUPPET_MASTER_RADIO_STRESS_TEST, "false");
            // Wait a bit before trying the next APN, so that
            // we're not tying up the RIL command channel.
            // This also helps in any external dependency to turn off the context.
            startAlarmForReconnect(getApnDelay(), apnContext);
        } else {
            apnContext.setApnSetting(null);
            apnContext.setDataConnectionAc(null);
        }
    }

    /**
     * Called when EVENT_DISCONNECT_DC_RETRYING is received.
     */
    @Override
    protected void onDisconnectDcRetrying(int connId, AsyncResult ar) {
        // We could just do this in DC!!!
        ApnContext apnContext = null;

        if (ar.userObj instanceof ApnContext) {
            apnContext = (ApnContext) ar.userObj;
        } else {
            loge("onDisconnectDcRetrying: Invalid ar in onDisconnectDone, ignore");
            return;
        }

        apnContext.setState(DctConstants.State.RETRYING);
        if(DBG) log("onDisconnectDcRetrying: apnContext=" + apnContext);

        mPhone.notifyDataConnection(apnContext.getReason(), apnContext.getApnType());
    }

    protected void onPollPdp() {
        if (getOverallState() == DctConstants.State.CONNECTED) {
            // only poll when connected
            mPhone.mCi.getDataCallList(obtainMessage(DctConstants.EVENT_DATA_STATE_CHANGED));
            sendMessageDelayed(obtainMessage(DctConstants.EVENT_POLL_PDP), POLL_PDP_MILLIS);
        }
    }

    @Override
    protected void onVoiceCallStarted() {
        if (DBG) log("onVoiceCallStarted");
        mInVoiceCall = true;
        if (isConnected() && ! mPhone.getServiceStateTracker().isConcurrentVoiceAndDataAllowed()) {
            if (DBG) log("onVoiceCallStarted stop polling");
            stopNetStatPoll();
            stopDataStallAlarm();
            notifyDataConnection(Phone.REASON_VOICE_CALL_STARTED);
        }
    }

    @Override
    protected void onVoiceCallEnded() {
        if (DBG) log("onVoiceCallEnded");
        mInVoiceCall = false;
        if (isConnected()) {
            if (!mPhone.getServiceStateTracker().isConcurrentVoiceAndDataAllowed()) {
                startNetStatPoll();
                startDataStallAlarm(DATA_STALL_NOT_SUSPECTED);
                notifyDataConnection(Phone.REASON_VOICE_CALL_ENDED);
            } else {
                // clean slate after call end.
                resetPollStats();
            }
        }
        // reset reconnect timer
        setupDataOnConnectableApns(Phone.REASON_VOICE_CALL_ENDED);
    }

    @Override
    protected void onCleanUpConnection(boolean tearDown, int apnId, String reason) {
        if (DBG) log("onCleanUpConnection");
        ApnContext apnContext = mApnContexts.get(apnIdToType(apnId));
        if (apnContext != null) {
            apnContext.setReason(reason);
            cleanUpConnection(tearDown, apnContext);
        }
    }

    @Override
    protected boolean isConnected() {
        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.getState() == DctConstants.State.CONNECTED) {
                // At least one context is connected, return true
                return true;
            }
        }
        // There are not any contexts connected, return false
        return false;
    }

    @Override
    public boolean isDisconnected() {
        for (ApnContext apnContext : mApnContexts.values()) {
            if (!apnContext.isDisconnected()) {
                // At least one context was not disconnected return false
                return false;
            }
        }
        // All contexts were disconnected so return true
        return true;
    }

    @Override
    protected void notifyDataConnection(String reason) {
        if (DBG) log("notifyDataConnection: reason=" + reason);
        for (ApnContext apnContext : mApnContexts.values()) {
            if (apnContext.isReady()) {
                if (DBG) log("notifyDataConnection: type:"+apnContext.getApnType());
                mPhone.notifyDataConnection(reason != null ? reason : apnContext.getReason(),
                        apnContext.getApnType());
            }
        }
        notifyOffApnsOfAvailability(reason);
    }

    /**
     * Based on the sim operator numeric, create a list for all possible
     * Data Connections and setup the preferredApn.
     */
    private void createAllApnList() {
        mAllApnSettings = new ArrayList<ApnSetting>();
        IccRecords r = mIccRecords.get();
        String operator = (r != null) ? r.getOperatorNumeric() : "";
        if (operator != null) {
            String selection = "numeric = '" + operator + "'";
            // query only enabled apn.
            // carrier_enabled : 1 means enabled apn, 0 disabled apn.
            selection += " and carrier_enabled = 1";
            if (DBG) log("createAllApnList: selection=" + selection);

            Cursor cursor = mPhone.getContext().getContentResolver().query(
                    Telephony.Carriers.CONTENT_URI, null, selection, null, null);

            if (cursor != null) {
                if (cursor.getCount() > 0) {
                    mAllApnSettings = createApnList(cursor);
                }
                cursor.close();
            }
        }

        if (mAllApnSettings.isEmpty()) {
            if (DBG) log("createAllApnList: No APN found for carrier: " + operator);
            mPreferredApn = null;
            // TODO: What is the right behavior?
            //notifyNoData(DataConnection.FailCause.MISSING_UNKNOWN_APN);
        } else {
            mPreferredApn = getPreferredApn();
            if (mPreferredApn != null && !mPreferredApn.numeric.equals(operator)) {
                mPreferredApn = null;
                setPreferredApn(-1);
            }
            if (DBG) log("createAllApnList: mPreferredApn=" + mPreferredApn);
        }
        if (DBG) log("createAllApnList: X mAllApnSettings=" + mAllApnSettings);
    }

    /** Return the DC AsyncChannel for the new data connection */
    private DcAsyncChannel createDataConnection() {
        if (DBG) log("createDataConnection E");

        int id = mUniqueIdGenerator.getAndIncrement();
        DataConnection conn = DataConnection.makeDataConnection(mPhone, id,
                                                this, mDcTesterFailBringUpAll, mDcc);
        mDataConnections.put(id, conn);
        DcAsyncChannel dcac = new DcAsyncChannel(conn, LOG_TAG);
        int status = dcac.fullyConnectSync(mPhone.getContext(), this, conn.getHandler());
        if (status == AsyncChannel.STATUS_SUCCESSFUL) {
            mDataConnectionAcHashMap.put(dcac.getDataConnectionIdSync(), dcac);
        } else {
            loge("createDataConnection: Could not connect to dcac=" + dcac + " status=" + status);
        }

        if (DBG) log("createDataConnection() X id=" + id + " dc=" + conn);
        return dcac;
    }

    private void destroyDataConnections() {
        if(mDataConnections != null) {
            if (DBG) log("destroyDataConnections: clear mDataConnectionList");
            mDataConnections.clear();
        } else {
            if (DBG) log("destroyDataConnections: mDataConnecitonList is empty, ignore");
        }
    }

    /**
     * Build a list of APNs to be used to create PDP's.
     *
     * @param requestedApnType
     * @return waitingApns list to be used to create PDP
     *          error when waitingApns.isEmpty()
     */
    private ArrayList<ApnSetting> buildWaitingApns(String requestedApnType) {
        if (DBG) log("buildWaitingApns: E requestedApnType=" + requestedApnType);
        ArrayList<ApnSetting> apnList = new ArrayList<ApnSetting>();

        if (requestedApnType.equals(PhoneConstants.APN_TYPE_DUN)) {
            ApnSetting dun = fetchDunApn();
            if (dun != null) {
                apnList.add(dun);
                if (DBG) log("buildWaitingApns: X added APN_TYPE_DUN apnList=" + apnList);
                return apnList;
            }
        }

        IccRecords r = mIccRecords.get();
        String operator = (r != null) ? r.getOperatorNumeric() : "";
        int radioTech = mPhone.getServiceState().getRilDataRadioTechnology();

        // This is a workaround for a bug (7305641) where we don't failover to other
        // suitable APNs if our preferred APN fails.  On prepaid ATT sims we need to
        // failover to a provisioning APN, but once we've used their default data
        // connection we are locked to it for life.  This change allows ATT devices
        // to say they don't want to use preferred at all.
        boolean usePreferred = true;
        try {
            usePreferred = ! mPhone.getContext().getResources().getBoolean(com.android.
                    internal.R.bool.config_dontPreferApn);
        } catch (Resources.NotFoundException e) {
            if (DBG) log("buildWaitingApns: usePreferred NotFoundException set to true");
            usePreferred = true;
        }
        if (DBG) {
            log("buildWaitingApns: usePreferred=" + usePreferred
                    + " canSetPreferApn=" + mCanSetPreferApn
                    + " mPreferredApn=" + mPreferredApn
                    + " operator=" + operator + " radioTech=" + radioTech
                    + " IccRecords r=" + r);
        }

        if (usePreferred && mCanSetPreferApn && mPreferredApn != null &&
                mPreferredApn.canHandleType(requestedApnType)) {
            if (DBG) {
                log("buildWaitingApns: Preferred APN:" + operator + ":"
                        + mPreferredApn.numeric + ":" + mPreferredApn);
            }
            if (mPreferredApn.numeric.equals(operator)) {
                if (mPreferredApn.bearer == 0 || mPreferredApn.bearer == radioTech) {
                    apnList.add(mPreferredApn);
                    if (DBG) log("buildWaitingApns: X added preferred apnList=" + apnList);
                    return apnList;
                } else {
                    if (DBG) log("buildWaitingApns: no preferred APN");
                    setPreferredApn(-1);
                    mPreferredApn = null;
                }
            } else {
                if (DBG) log("buildWaitingApns: no preferred APN");
                setPreferredApn(-1);
                mPreferredApn = null;
            }
        }
        if (mAllApnSettings != null) {
            if (DBG) log("buildWaitingApns: mAllApnSettings=" + mAllApnSettings);
            for (ApnSetting apn : mAllApnSettings) {
                if (DBG) log("buildWaitingApns: apn=" + apn);
                if (apn.canHandleType(requestedApnType)) {
                    if (apn.bearer == 0 || apn.bearer == radioTech) {
                        if (DBG) log("buildWaitingApns: adding apn=" + apn.toString());
                        apnList.add(apn);
                    } else {
                        if (DBG) {
                            log("buildWaitingApns: bearer:" + apn.bearer + " != "
                                    + "radioTech:" + radioTech);
                        }
                    }
                } else {
                if (DBG) {
                    log("buildWaitingApns: couldn't handle requesedApnType="
                            + requestedApnType);
                }
            }
            }
        } else {
            loge("mAllApnSettings is empty!");
        }
        if (DBG) log("buildWaitingApns: X apnList=" + apnList);
        return apnList;
    }

    private String apnListToString (ArrayList<ApnSetting> apns) {
        StringBuilder result = new StringBuilder();
        for (int i = 0, size = apns.size(); i < size; i++) {
            result.append('[')
                  .append(apns.get(i).toString())
                  .append(']');
        }
        return result.toString();
    }

    private void setPreferredApn(int pos) {
        if (!mCanSetPreferApn) {
            log("setPreferredApn: X !canSEtPreferApn");
            return;
        }

        log("setPreferredApn: delete");
        ContentResolver resolver = mPhone.getContext().getContentResolver();
        resolver.delete(PREFERAPN_NO_UPDATE_URI, null, null);

        if (pos >= 0) {
            log("setPreferredApn: insert");
            ContentValues values = new ContentValues();
            values.put(APN_ID, pos);
            resolver.insert(PREFERAPN_NO_UPDATE_URI, values);
        }
    }

    private ApnSetting getPreferredApn() {
        if (mAllApnSettings.isEmpty()) {
            log("getPreferredApn: X not found mAllApnSettings.isEmpty");
            return null;
        }

        Cursor cursor = mPhone.getContext().getContentResolver().query(
                PREFERAPN_NO_UPDATE_URI, new String[] { "_id", "name", "apn" },
                null, null, Telephony.Carriers.DEFAULT_SORT_ORDER);

        if (cursor != null) {
            mCanSetPreferApn = true;
        } else {
            mCanSetPreferApn = false;
        }
        log("getPreferredApn: mRequestedApnType=" + mRequestedApnType + " cursor=" + cursor
                + " cursor.count=" + ((cursor != null) ? cursor.getCount() : 0));

        if (mCanSetPreferApn && cursor.getCount() > 0) {
            int pos;
            cursor.moveToFirst();
            pos = cursor.getInt(cursor.getColumnIndexOrThrow(Telephony.Carriers._ID));
            for(ApnSetting p : mAllApnSettings) {
                log("getPreferredApn: apnSetting=" + p);
                if (p.id == pos && p.canHandleType(mRequestedApnType)) {
                    log("getPreferredApn: X found apnSetting" + p);
                    cursor.close();
                    return p;
                }
            }
        }

        if (cursor != null) {
            cursor.close();
        }

        log("getPreferredApn: X not found");
        return null;
    }

    @Override
    public void handleMessage (Message msg) {
        if (DBG) log("handleMessage msg=" + msg);

        if (!mPhone.mIsTheCurrentActivePhone || mIsDisposed) {
            loge("handleMessage: Ignore GSM msgs since GSM phone is inactive");
            return;
        }

        switch (msg.what) {
            case DctConstants.EVENT_RECORDS_LOADED:
                onRecordsLoaded();
                break;

            case DctConstants.EVENT_DATA_CONNECTION_DETACHED:
                onDataConnectionDetached();
                break;

            case DctConstants.EVENT_DATA_CONNECTION_ATTACHED:
                onDataConnectionAttached();
                break;

            case DctConstants.EVENT_DATA_STATE_CHANGED:
                onDataStateChanged((AsyncResult) msg.obj);
                break;

            case DctConstants.EVENT_POLL_PDP:
                onPollPdp();
                break;

            case DctConstants.EVENT_DO_RECOVERY:
                doRecovery();
                break;

            case DctConstants.EVENT_APN_CHANGED:
                onApnChanged();
                break;

            case DctConstants.EVENT_PS_RESTRICT_ENABLED:
                /**
                 * We don't need to explicitly to tear down the PDP context
                 * when PS restricted is enabled. The base band will deactive
                 * PDP context and notify us with PDP_CONTEXT_CHANGED.
                 * But we should stop the network polling and prevent reset PDP.
                 */
                if (DBG) log("EVENT_PS_RESTRICT_ENABLED " + mIsPsRestricted);
                stopNetStatPoll();
                stopDataStallAlarm();
                mIsPsRestricted = true;
                break;

            case DctConstants.EVENT_PS_RESTRICT_DISABLED:
                /**
                 * When PS restrict is removed, we need setup PDP connection if
                 * PDP connection is down.
                 */
                if (DBG) log("EVENT_PS_RESTRICT_DISABLED " + mIsPsRestricted);
                mIsPsRestricted  = false;
                if (isConnected()) {
                    startNetStatPoll();
                    startDataStallAlarm(DATA_STALL_NOT_SUSPECTED);
                } else {
                    // TODO: Should all PDN states be checked to fail?
                    if (mState == DctConstants.State.FAILED) {
                        cleanUpAllConnections(false, Phone.REASON_PS_RESTRICT_ENABLED);
                        mReregisterOnReconnectFailure = false;
                    }
                    trySetupData(Phone.REASON_PS_RESTRICT_ENABLED, PhoneConstants.APN_TYPE_DEFAULT);
                }
                break;

            case DctConstants.EVENT_TRY_SETUP_DATA:
                if (msg.obj instanceof ApnContext) {
                    onTrySetupData((ApnContext)msg.obj);
                } else if (msg.obj instanceof String) {
                    onTrySetupData((String)msg.obj);
                } else {
                    loge("EVENT_TRY_SETUP request w/o apnContext or String");
                }
                break;

            case DctConstants.EVENT_CLEAN_UP_CONNECTION:
                boolean tearDown = (msg.arg1 == 0) ? false : true;
                if (DBG) log("EVENT_CLEAN_UP_CONNECTION tearDown=" + tearDown);
                if (msg.obj instanceof ApnContext) {
                    cleanUpConnection(tearDown, (ApnContext)msg.obj);
                } else {
                    loge("EVENT_CLEAN_UP_CONNECTION request w/o apn context, call super");
                    super.handleMessage(msg);
                }
                break;

            default:
                // handle the message in the super class DataConnectionTracker
                super.handleMessage(msg);
                break;
        }
    }

    protected int getApnProfileID(String apnType) {
        if (TextUtils.equals(apnType, PhoneConstants.APN_TYPE_IMS)) {
            return RILConstants.DATA_PROFILE_IMS;
        } else if (TextUtils.equals(apnType, PhoneConstants.APN_TYPE_FOTA)) {
            return RILConstants.DATA_PROFILE_FOTA;
        } else if (TextUtils.equals(apnType, PhoneConstants.APN_TYPE_CBS)) {
            return RILConstants.DATA_PROFILE_CBS;
        } else {
            return RILConstants.DATA_PROFILE_DEFAULT;
        }
    }

    private int getCellLocationId() {
        int cid = -1;
        CellLocation loc = mPhone.getCellLocation();

        if (loc != null) {
            if (loc instanceof GsmCellLocation) {
                cid = ((GsmCellLocation)loc).getCid();
            } else if (loc instanceof CdmaCellLocation) {
                cid = ((CdmaCellLocation)loc).getBaseStationId();
            }
        }
        return cid;
    }

    @Override
    protected void onUpdateIcc() {
        if (mUiccController == null ) {
            return;
        }

        IccRecords newIccRecords = mUiccController.getIccRecords(UiccController.APP_FAM_3GPP);

        IccRecords r = mIccRecords.get();
        if (r != newIccRecords) {
            if (r != null) {
                log("Removing stale icc objects.");
                r.unregisterForRecordsLoaded(this);
                mIccRecords.set(null);
            }
            if (newIccRecords != null) {
                log("New records found");
                mIccRecords.set(newIccRecords);
                newIccRecords.registerForRecordsLoaded(
                        this, DctConstants.EVENT_RECORDS_LOADED, null);
            }
        }
    }

    @Override
    protected void log(String s) {
        Rlog.d(LOG_TAG, s);
    }

    @Override
    protected void loge(String s) {
        Rlog.e(LOG_TAG, s);
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("DataConnectionTracker extends:");
        super.dump(fd, pw, args);
        pw.println(" mReregisterOnReconnectFailure=" + mReregisterOnReconnectFailure);
        pw.println(" canSetPreferApn=" + mCanSetPreferApn);
        pw.println(" mApnObserver=" + mApnObserver);
        pw.println(" getOverallState=" + getOverallState());
        pw.println(" mDataConnectionAsyncChannels=%s\n" + mDataConnectionAcHashMap);
    }
}