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      1 /*
      2  * Copyright (C) 2010 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.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.ServiceConnection;
     23 import android.location.Address;
     24 import android.location.GeocoderParams;
     25 import android.location.IGeocodeProvider;
     26 import android.os.IBinder;
     27 import android.os.RemoteException;
     28 import android.os.SystemClock;
     29 import android.util.Log;
     30 
     31 import java.util.List;
     32 
     33 /**
     34  * A class for proxying IGeocodeProvider implementations.
     35  *
     36  * {@hide}
     37  */
     38 public class GeocoderProxy {
     39 
     40     private static final String TAG = "GeocoderProxy";
     41 
     42     private final Context mContext;
     43     private final Intent mIntent;
     44     private final Object mMutex = new Object();  // synchronizes access to mServiceConnection
     45     private Connection mServiceConnection = new Connection();  // never null
     46 
     47     public GeocoderProxy(Context context, String serviceName) {
     48         mContext = context;
     49         mIntent = new Intent(serviceName);
     50         mContext.bindService(mIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
     51     }
     52 
     53     /**
     54      * When unbundled NetworkLocationService package is updated, we
     55      * need to unbind from the old version and re-bind to the new one.
     56      */
     57     public void reconnect() {
     58         synchronized (mMutex) {
     59             mContext.unbindService(mServiceConnection);
     60             mServiceConnection = new Connection();
     61             mContext.bindService(mIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
     62         }
     63     }
     64 
     65     private class Connection implements ServiceConnection {
     66 
     67         private IGeocodeProvider mProvider;
     68 
     69         public void onServiceConnected(ComponentName className, IBinder service) {
     70             Log.d(TAG, "onServiceConnected " + className);
     71             synchronized (this) {
     72                 mProvider = IGeocodeProvider.Stub.asInterface(service);
     73             }
     74         }
     75 
     76         public void onServiceDisconnected(ComponentName className) {
     77             Log.d(TAG, "onServiceDisconnected " + className);
     78             synchronized (this) {
     79                 mProvider = null;
     80             }
     81         }
     82 
     83         public IGeocodeProvider getProvider() {
     84             synchronized (this) {
     85                 return mProvider;
     86             }
     87         }
     88     }
     89 
     90     public String getFromLocation(double latitude, double longitude, int maxResults,
     91             GeocoderParams params, List<Address> addrs) {
     92         IGeocodeProvider provider;
     93         synchronized (mMutex) {
     94             provider = mServiceConnection.getProvider();
     95         }
     96         if (provider != null) {
     97             try {
     98                 return provider.getFromLocation(latitude, longitude, maxResults,
     99                         params, addrs);
    100             } catch (RemoteException e) {
    101                 Log.e(TAG, "getFromLocation failed", e);
    102             }
    103         }
    104         return "Service not Available";
    105     }
    106 
    107     public String getFromLocationName(String locationName,
    108             double lowerLeftLatitude, double lowerLeftLongitude,
    109             double upperRightLatitude, double upperRightLongitude, int maxResults,
    110             GeocoderParams params, List<Address> addrs) {
    111         IGeocodeProvider provider;
    112         synchronized (mMutex) {
    113             provider = mServiceConnection.getProvider();
    114         }
    115         if (provider != null) {
    116             try {
    117                 return provider.getFromLocationName(locationName, lowerLeftLatitude,
    118                         lowerLeftLongitude, upperRightLatitude, upperRightLongitude,
    119                         maxResults, params, addrs);
    120             } catch (RemoteException e) {
    121                 Log.e(TAG, "getFromLocationName failed", e);
    122             }
    123         }
    124         return "Service not Available";
    125     }
    126 }
    127