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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.GpsNavigationMessageEvent;
     20 import android.location.IGpsNavigationMessageListener;
     21 import android.os.Handler;
     22 import android.os.RemoteException;
     23 import android.util.Log;
     24 
     25 /**
     26  * An base implementation for GPS navigation messages provider.
     27  * It abstracts out the responsibility of handling listeners, while still allowing technology
     28  * specific implementations to be built.
     29  *
     30  * @hide
     31  */
     32 public abstract class GpsNavigationMessageProvider
     33         extends RemoteListenerHelper<IGpsNavigationMessageListener> {
     34     private static final String TAG = "GpsNavigationMessageProvider";
     35 
     36     public GpsNavigationMessageProvider(Handler handler) {
     37         super(handler, TAG);
     38     }
     39 
     40     public void onNavigationMessageAvailable(final GpsNavigationMessageEvent event) {
     41         ListenerOperation<IGpsNavigationMessageListener> operation =
     42                 new ListenerOperation<IGpsNavigationMessageListener>() {
     43                     @Override
     44                     public void execute(IGpsNavigationMessageListener listener)
     45                             throws RemoteException {
     46                         listener.onGpsNavigationMessageReceived(event);
     47                     }
     48                 };
     49         foreach(operation);
     50     }
     51 
     52     public void onCapabilitiesUpdated(boolean isGpsNavigationMessageSupported) {
     53         int status = isGpsNavigationMessageSupported ?
     54                 GpsNavigationMessageEvent.STATUS_READY :
     55                 GpsNavigationMessageEvent.STATUS_NOT_SUPPORTED;
     56         setSupported(isGpsNavigationMessageSupported, new StatusChangedOperation(status));
     57     }
     58 
     59     @Override
     60     protected ListenerOperation<IGpsNavigationMessageListener> getHandlerOperation(int result) {
     61         final int status;
     62         switch (result) {
     63             case RESULT_SUCCESS:
     64                 status = GpsNavigationMessageEvent.STATUS_READY;
     65                 break;
     66             case RESULT_NOT_AVAILABLE:
     67             case RESULT_NOT_SUPPORTED:
     68             case RESULT_INTERNAL_ERROR:
     69                 status = GpsNavigationMessageEvent.STATUS_NOT_SUPPORTED;
     70                 break;
     71             case RESULT_GPS_LOCATION_DISABLED:
     72                 status = GpsNavigationMessageEvent.STATUS_GPS_LOCATION_DISABLED;
     73                 break;
     74             default:
     75                 Log.v(TAG, "Unhandled addListener result: " + result);
     76                 return null;
     77         }
     78         return new StatusChangedOperation(status);
     79     }
     80 
     81     @Override
     82     protected void handleGpsEnabledChanged(boolean enabled) {
     83         int status = enabled ?
     84                 GpsNavigationMessageEvent.STATUS_READY :
     85                 GpsNavigationMessageEvent.STATUS_GPS_LOCATION_DISABLED;
     86         foreach(new StatusChangedOperation(status));
     87     }
     88 
     89     private class StatusChangedOperation
     90             implements ListenerOperation<IGpsNavigationMessageListener> {
     91         private final int mStatus;
     92 
     93         public StatusChangedOperation(int status) {
     94             mStatus = status;
     95         }
     96 
     97         @Override
     98         public void execute(IGpsNavigationMessageListener listener) throws RemoteException {
     99             listener.onStatusChanged(mStatus);
    100         }
    101     }
    102 }
    103