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      1 /*
      2  * Copyright (C) 2014 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.server.location;
     18 
     19 import android.location.GnssNavigationMessage;
     20 import android.location.IGnssNavigationMessageListener;
     21 import android.os.Handler;
     22 import android.os.RemoteException;
     23 import android.util.Log;
     24 
     25 import com.android.internal.annotations.VisibleForTesting;
     26 
     27 /**
     28  * An base implementation for GPS navigation messages provider.
     29  * It abstracts out the responsibility of handling listeners, while still allowing technology
     30  * specific implementations to be built.
     31  *
     32  * @hide
     33  */
     34 public abstract class GnssNavigationMessageProvider
     35         extends RemoteListenerHelper<IGnssNavigationMessageListener> {
     36     private static final String TAG = "GnssNavigationMessageProvider";
     37     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
     38 
     39     private final GnssNavigationMessageProviderNative mNative;
     40     private boolean mCollectionStarted;
     41 
     42     protected GnssNavigationMessageProvider(Handler handler) {
     43         this(handler, new GnssNavigationMessageProviderNative());
     44     }
     45 
     46     @VisibleForTesting
     47     GnssNavigationMessageProvider(Handler handler, GnssNavigationMessageProviderNative aNative) {
     48         super(handler, TAG);
     49         mNative = aNative;
     50     }
     51 
     52     // TODO(b/37460011): Use this with death recovery logic.
     53     void resumeIfStarted() {
     54         if (DEBUG) {
     55             Log.d(TAG, "resumeIfStarted");
     56         }
     57         if (mCollectionStarted) {
     58             mNative.startNavigationMessageCollection();
     59         }
     60     }
     61 
     62     @Override
     63     protected boolean isAvailableInPlatform() {
     64         return mNative.isNavigationMessageSupported();
     65     }
     66 
     67     @Override
     68     protected int registerWithService() {
     69         boolean result = mNative.startNavigationMessageCollection();
     70         if (result) {
     71             mCollectionStarted = true;
     72             return RemoteListenerHelper.RESULT_SUCCESS;
     73         } else {
     74             return RemoteListenerHelper.RESULT_INTERNAL_ERROR;
     75         }
     76     }
     77 
     78     @Override
     79     protected void unregisterFromService() {
     80         boolean stopped = mNative.stopNavigationMessageCollection();
     81         if (stopped) {
     82             mCollectionStarted = false;
     83         }
     84     }
     85 
     86     public void onNavigationMessageAvailable(final GnssNavigationMessage event) {
     87         ListenerOperation<IGnssNavigationMessageListener> operation =
     88                 new ListenerOperation<IGnssNavigationMessageListener>() {
     89                     @Override
     90                     public void execute(IGnssNavigationMessageListener listener)
     91                             throws RemoteException {
     92                         listener.onGnssNavigationMessageReceived(event);
     93                     }
     94                 };
     95         foreach(operation);
     96     }
     97 
     98     public void onCapabilitiesUpdated(boolean isGnssNavigationMessageSupported) {
     99         setSupported(isGnssNavigationMessageSupported);
    100         updateResult();
    101     }
    102 
    103     public void onGpsEnabledChanged() {
    104         tryUpdateRegistrationWithService();
    105         updateResult();
    106     }
    107 
    108     @Override
    109     protected ListenerOperation<IGnssNavigationMessageListener> getHandlerOperation(int result) {
    110         int status;
    111         switch (result) {
    112             case RESULT_SUCCESS:
    113                 status = GnssNavigationMessage.Callback.STATUS_READY;
    114                 break;
    115             case RESULT_NOT_AVAILABLE:
    116             case RESULT_NOT_SUPPORTED:
    117             case RESULT_INTERNAL_ERROR:
    118                 status = GnssNavigationMessage.Callback.STATUS_NOT_SUPPORTED;
    119                 break;
    120             case RESULT_GPS_LOCATION_DISABLED:
    121                 status = GnssNavigationMessage.Callback.STATUS_LOCATION_DISABLED;
    122                 break;
    123             case RESULT_UNKNOWN:
    124                 return null;
    125             default:
    126                 Log.v(TAG, "Unhandled addListener result: " + result);
    127                 return null;
    128         }
    129         return new StatusChangedOperation(status);
    130     }
    131 
    132     private static class StatusChangedOperation
    133             implements ListenerOperation<IGnssNavigationMessageListener> {
    134         private final int mStatus;
    135 
    136         public StatusChangedOperation(int status) {
    137             mStatus = status;
    138         }
    139 
    140         @Override
    141         public void execute(IGnssNavigationMessageListener listener) throws RemoteException {
    142             listener.onStatusChanged(mStatus);
    143         }
    144     }
    145 
    146     @VisibleForTesting
    147     static class GnssNavigationMessageProviderNative {
    148         public boolean isNavigationMessageSupported() {
    149             return native_is_navigation_message_supported();
    150         }
    151 
    152         public boolean startNavigationMessageCollection() {
    153             return native_start_navigation_message_collection();
    154         }
    155 
    156         public boolean stopNavigationMessageCollection() {
    157             return native_stop_navigation_message_collection();
    158         }
    159     }
    160 
    161     private static native boolean native_is_navigation_message_supported();
    162 
    163     private static native boolean native_start_navigation_message_collection();
    164 
    165     private static native boolean native_stop_navigation_message_collection();
    166 }
    167