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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.GnssMeasurementsEvent;
     20 import android.location.IGnssMeasurementsListener;
     21 import android.os.Handler;
     22 import android.os.RemoteException;
     23 import android.util.Log;
     24 
     25 /**
     26  * An base implementation for GPS measurements 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 GnssMeasurementsProvider
     33         extends RemoteListenerHelper<IGnssMeasurementsListener> {
     34     private static final String TAG = "GnssMeasurementsProvider";
     35 
     36     protected GnssMeasurementsProvider(Handler handler) {
     37         super(handler, TAG);
     38     }
     39 
     40     public void onMeasurementsAvailable(final GnssMeasurementsEvent event) {
     41         ListenerOperation<IGnssMeasurementsListener> operation =
     42                 new ListenerOperation<IGnssMeasurementsListener>() {
     43             @Override
     44             public void execute(IGnssMeasurementsListener listener) throws RemoteException {
     45                 listener.onGnssMeasurementsReceived(event);
     46             }
     47         };
     48         foreach(operation);
     49     }
     50 
     51     public void onCapabilitiesUpdated(boolean isGnssMeasurementsSupported) {
     52         setSupported(isGnssMeasurementsSupported);
     53         updateResult();
     54     }
     55 
     56     public void onGpsEnabledChanged() {
     57         if (tryUpdateRegistrationWithService()) {
     58             updateResult();
     59         }
     60     }
     61 
     62     @Override
     63     protected ListenerOperation<IGnssMeasurementsListener> getHandlerOperation(int result) {
     64         int status;
     65         switch (result) {
     66             case RESULT_SUCCESS:
     67                 status = GnssMeasurementsEvent.Callback.STATUS_READY;
     68                 break;
     69             case RESULT_NOT_AVAILABLE:
     70             case RESULT_NOT_SUPPORTED:
     71             case RESULT_INTERNAL_ERROR:
     72                 status = GnssMeasurementsEvent.Callback.STATUS_NOT_SUPPORTED;
     73                 break;
     74             case RESULT_GPS_LOCATION_DISABLED:
     75                 status = GnssMeasurementsEvent.Callback.STATUS_LOCATION_DISABLED;
     76                 break;
     77             case RESULT_UNKNOWN:
     78                 return null;
     79             default:
     80                 Log.v(TAG, "Unhandled addListener result: " + result);
     81                 return null;
     82         }
     83         return new StatusChangedOperation(status);
     84     }
     85 
     86     private static class StatusChangedOperation
     87             implements ListenerOperation<IGnssMeasurementsListener> {
     88         private final int mStatus;
     89 
     90         public StatusChangedOperation(int status) {
     91             mStatus = status;
     92         }
     93 
     94         @Override
     95         public void execute(IGnssMeasurementsListener listener) throws RemoteException {
     96             listener.onStatusChanged(mStatus);
     97         }
     98     }
     99 }
    100