services/core/java/com/android/server/location/GeocoderProxy.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server.location;

import android.content.Context;
import android.location.Address;
import android.location.GeocoderParams;
import android.location.IGeocodeProvider;
import android.os.Handler;
import android.os.RemoteException;
import android.util.Log;

import com.android.server.ServiceWatcher;
import java.util.List;

/**
 * Proxy for IGeocodeProvider implementations.
 */
public class GeocoderProxy {
    private static final String TAG = "GeocoderProxy";

    private static final String SERVICE_ACTION = "com.android.location.service.GeocodeProvider";

    private final Context mContext;
    private final ServiceWatcher mServiceWatcher;

    public static GeocoderProxy createAndBind(Context context,
            int overlaySwitchResId, int defaultServicePackageNameResId,
            int initialPackageNamesResId, Handler handler) {
        GeocoderProxy proxy = new GeocoderProxy(context, overlaySwitchResId,
            defaultServicePackageNameResId, initialPackageNamesResId, handler);
        if (proxy.bind()) {
            return proxy;
        } else {
            return null;
        }
    }

    private GeocoderProxy(Context context,
            int overlaySwitchResId, int defaultServicePackageNameResId,
            int initialPackageNamesResId, Handler handler) {
        mContext = context;

        mServiceWatcher = new ServiceWatcher(mContext, TAG, SERVICE_ACTION, overlaySwitchResId,
            defaultServicePackageNameResId, initialPackageNamesResId, null, handler);
    }

    private boolean bind () {
        return mServiceWatcher.start();
    }

    private IGeocodeProvider getService() {
        return IGeocodeProvider.Stub.asInterface(mServiceWatcher.getBinder());
    }

    public String getConnectedPackageName() {
        return mServiceWatcher.getBestPackageName();
    }

    public String getFromLocation(double latitude, double longitude, int maxResults,
            GeocoderParams params, List<Address> addrs) {
        IGeocodeProvider provider = getService();
        if (provider != null) {
            try {
                return provider.getFromLocation(latitude, longitude, maxResults, params, addrs);
            } catch (RemoteException e) {
                Log.w(TAG, e);
            }
        }
        return "Service not Available";
    }

    public String getFromLocationName(String locationName,
            double lowerLeftLatitude, double lowerLeftLongitude,
            double upperRightLatitude, double upperRightLongitude, int maxResults,
            GeocoderParams params, List<Address> addrs) {
        IGeocodeProvider provider = getService();
        if (provider != null) {
            try {
                return provider.getFromLocationName(locationName, lowerLeftLatitude,
                        lowerLeftLongitude, upperRightLatitude, upperRightLongitude,
                        maxResults, params, addrs);
            } catch (RemoteException e) {
                Log.w(TAG, e);
            }
        }
        return "Service not Available";
    }

}