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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.telephony;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.os.AsyncResult;
     24 import android.os.Handler;
     25 import android.os.Message;
     26 import android.os.PowerManager;
     27 import android.provider.Telephony.Sms.Intents;
     28 import android.telephony.Rlog;
     29 
     30 /**
     31  * Monitors the device and ICC storage, and sends the appropriate events.
     32  *
     33  * This code was formerly part of {@link SMSDispatcher}, and has been moved
     34  * into a separate class to support instantiation of multiple SMSDispatchers on
     35  * dual-mode devices that require support for both 3GPP and 3GPP2 format messages.
     36  */
     37 public final class SmsStorageMonitor extends Handler {
     38     private static final String TAG = "SmsStorageMonitor";
     39 
     40     /** SIM/RUIM storage is full */
     41     private static final int EVENT_ICC_FULL = 1;
     42 
     43     /** Memory status reporting is acknowledged by RIL */
     44     private static final int EVENT_REPORT_MEMORY_STATUS_DONE = 2;
     45 
     46     /** Radio is ON */
     47     private static final int EVENT_RADIO_ON = 3;
     48 
     49     /** Context from phone object passed to constructor. */
     50     private final Context mContext;
     51 
     52     /** Wake lock to ensure device stays awake while dispatching the SMS intent. */
     53     private PowerManager.WakeLock mWakeLock;
     54 
     55     private boolean mReportMemoryStatusPending;
     56 
     57     final CommandsInterface mCi;                            // accessed from inner class
     58     boolean mStorageAvailable = true;                       // accessed from inner class
     59 
     60     /**
     61      * Hold the wake lock for 5 seconds, which should be enough time for
     62      * any receiver(s) to grab its own wake lock.
     63      */
     64     private static final int WAKE_LOCK_TIMEOUT = 5000;
     65 
     66     /**
     67      * Creates an SmsStorageMonitor and registers for events.
     68      * @param phone the Phone to use
     69      */
     70     public SmsStorageMonitor(PhoneBase phone) {
     71         mContext = phone.getContext();
     72         mCi = phone.mCi;
     73 
     74         createWakelock();
     75 
     76         mCi.setOnIccSmsFull(this, EVENT_ICC_FULL, null);
     77         mCi.registerForOn(this, EVENT_RADIO_ON, null);
     78 
     79         // Register for device storage intents.  Use these to notify the RIL
     80         // that storage for SMS is or is not available.
     81         IntentFilter filter = new IntentFilter();
     82         filter.addAction(Intent.ACTION_DEVICE_STORAGE_FULL);
     83         filter.addAction(Intent.ACTION_DEVICE_STORAGE_NOT_FULL);
     84         mContext.registerReceiver(mResultReceiver, filter);
     85     }
     86 
     87     public void dispose() {
     88         mCi.unSetOnIccSmsFull(this);
     89         mCi.unregisterForOn(this);
     90         mContext.unregisterReceiver(mResultReceiver);
     91     }
     92 
     93     /**
     94      * Handles events coming from the phone stack. Overridden from handler.
     95      * @param msg the message to handle
     96      */
     97     @Override
     98     public void handleMessage(Message msg) {
     99         AsyncResult ar;
    100 
    101         switch (msg.what) {
    102             case EVENT_ICC_FULL:
    103                 handleIccFull();
    104                 break;
    105 
    106             case EVENT_REPORT_MEMORY_STATUS_DONE:
    107                 ar = (AsyncResult) msg.obj;
    108                 if (ar.exception != null) {
    109                     mReportMemoryStatusPending = true;
    110                     Rlog.v(TAG, "Memory status report to modem pending : mStorageAvailable = "
    111                             + mStorageAvailable);
    112                 } else {
    113                     mReportMemoryStatusPending = false;
    114                 }
    115                 break;
    116 
    117             case EVENT_RADIO_ON:
    118                 if (mReportMemoryStatusPending) {
    119                     Rlog.v(TAG, "Sending pending memory status report : mStorageAvailable = "
    120                             + mStorageAvailable);
    121                     mCi.reportSmsMemoryStatus(mStorageAvailable,
    122                             obtainMessage(EVENT_REPORT_MEMORY_STATUS_DONE));
    123                 }
    124                 break;
    125         }
    126     }
    127 
    128     private void createWakelock() {
    129         PowerManager pm = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
    130         mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "SmsStorageMonitor");
    131         mWakeLock.setReferenceCounted(true);
    132     }
    133 
    134     /**
    135      * Called when SIM_FULL message is received from the RIL.  Notifies interested
    136      * parties that SIM storage for SMS messages is full.
    137      */
    138     private void handleIccFull() {
    139         // broadcast SIM_FULL intent
    140         Intent intent = new Intent(Intents.SIM_FULL_ACTION);
    141         mWakeLock.acquire(WAKE_LOCK_TIMEOUT);
    142         mContext.sendBroadcast(intent, SMSDispatcher.RECEIVE_SMS_PERMISSION);
    143     }
    144 
    145     /** Returns whether or not there is storage available for an incoming SMS. */
    146     public boolean isStorageAvailable() {
    147         return mStorageAvailable;
    148     }
    149 
    150     private final BroadcastReceiver mResultReceiver = new BroadcastReceiver() {
    151         @Override
    152         public void onReceive(Context context, Intent intent) {
    153             if (intent.getAction().equals(Intent.ACTION_DEVICE_STORAGE_FULL)) {
    154                 mStorageAvailable = false;
    155                 mCi.reportSmsMemoryStatus(false, obtainMessage(EVENT_REPORT_MEMORY_STATUS_DONE));
    156             } else if (intent.getAction().equals(Intent.ACTION_DEVICE_STORAGE_NOT_FULL)) {
    157                 mStorageAvailable = true;
    158                 mCi.reportSmsMemoryStatus(true, obtainMessage(EVENT_REPORT_MEMORY_STATUS_DONE));
    159             }
    160         }
    161     };
    162 }
    163