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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 /**
     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 GnssNavigationMessageProvider
     33         extends RemoteListenerHelper<IGnssNavigationMessageListener> {
     34     private static final String TAG = "GnssNavigationMessageProvider";
     35 
     36     protected GnssNavigationMessageProvider(Handler handler) {
     37         super(handler, TAG);
     38     }
     39 
     40     public void onNavigationMessageAvailable(final GnssNavigationMessage event) {
     41         ListenerOperation<IGnssNavigationMessageListener> operation =
     42                 new ListenerOperation<IGnssNavigationMessageListener>() {
     43                     @Override
     44                     public void execute(IGnssNavigationMessageListener listener)
     45                             throws RemoteException {
     46                         listener.onGnssNavigationMessageReceived(event);
     47                     }
     48                 };
     49         foreach(operation);
     50     }
     51 
     52     public void onCapabilitiesUpdated(boolean isGnssNavigationMessageSupported) {
     53         setSupported(isGnssNavigationMessageSupported);
     54         updateResult();
     55     }
     56 
     57     public void onGpsEnabledChanged() {
     58         if (tryUpdateRegistrationWithService()) {
     59             updateResult();
     60         }
     61     }
     62 
     63     @Override
     64     protected ListenerOperation<IGnssNavigationMessageListener> getHandlerOperation(int result) {
     65         int status;
     66         switch (result) {
     67             case RESULT_SUCCESS:
     68                 status = GnssNavigationMessage.Callback.STATUS_READY;
     69                 break;
     70             case RESULT_NOT_AVAILABLE:
     71             case RESULT_NOT_SUPPORTED:
     72             case RESULT_INTERNAL_ERROR:
     73                 status = GnssNavigationMessage.Callback.STATUS_NOT_SUPPORTED;
     74                 break;
     75             case RESULT_GPS_LOCATION_DISABLED:
     76                 status = GnssNavigationMessage.Callback.STATUS_LOCATION_DISABLED;
     77                 break;
     78             case RESULT_UNKNOWN:
     79                 return null;
     80             default:
     81                 Log.v(TAG, "Unhandled addListener result: " + result);
     82                 return null;
     83         }
     84         return new StatusChangedOperation(status);
     85     }
     86 
     87     private static class StatusChangedOperation
     88             implements ListenerOperation<IGnssNavigationMessageListener> {
     89         private final int mStatus;
     90 
     91         public StatusChangedOperation(int status) {
     92             mStatus = status;
     93         }
     94 
     95         @Override
     96         public void execute(IGnssNavigationMessageListener listener) throws RemoteException {
     97             listener.onStatusChanged(mStatus);
     98         }
     99     }
    100 }
    101