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
17package com.android.server.location;
18
19import android.location.GpsMeasurementsEvent;
20import android.location.IGpsMeasurementsListener;
21import android.os.Handler;
22import android.os.RemoteException;
23import 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 */
32public abstract class GpsMeasurementsProvider
33        extends RemoteListenerHelper<IGpsMeasurementsListener> {
34    private static final String TAG = "GpsMeasurementsProvider";
35
36    public GpsMeasurementsProvider(Handler handler) {
37        super(handler, TAG);
38    }
39
40    public void onMeasurementsAvailable(final GpsMeasurementsEvent event) {
41        ListenerOperation<IGpsMeasurementsListener> operation =
42                new ListenerOperation<IGpsMeasurementsListener>() {
43            @Override
44            public void execute(IGpsMeasurementsListener listener) throws RemoteException {
45                listener.onGpsMeasurementsReceived(event);
46            }
47        };
48        foreach(operation);
49    }
50
51    public void onCapabilitiesUpdated(boolean isGpsMeasurementsSupported) {
52        int status = isGpsMeasurementsSupported ?
53                GpsMeasurementsEvent.STATUS_READY :
54                GpsMeasurementsEvent.STATUS_NOT_SUPPORTED;
55        setSupported(isGpsMeasurementsSupported, new StatusChangedOperation(status));
56    }
57
58    @Override
59    protected ListenerOperation<IGpsMeasurementsListener> getHandlerOperation(int result) {
60        final int status;
61        switch (result) {
62            case RESULT_SUCCESS:
63                status = GpsMeasurementsEvent.STATUS_READY;
64                break;
65            case RESULT_NOT_AVAILABLE:
66            case RESULT_NOT_SUPPORTED:
67            case RESULT_INTERNAL_ERROR:
68                status = GpsMeasurementsEvent.STATUS_NOT_SUPPORTED;
69                break;
70            case RESULT_GPS_LOCATION_DISABLED:
71                status = GpsMeasurementsEvent.STATUS_GPS_LOCATION_DISABLED;
72                break;
73            default:
74                Log.v(TAG, "Unhandled addListener result: " + result);
75                return null;
76        }
77        return new StatusChangedOperation(status);
78    }
79
80    @Override
81    protected void handleGpsEnabledChanged(boolean enabled) {
82        int status = enabled ?
83                GpsMeasurementsEvent.STATUS_READY :
84                GpsMeasurementsEvent.STATUS_GPS_LOCATION_DISABLED;
85        foreach(new StatusChangedOperation(status));
86    }
87
88    private class StatusChangedOperation implements ListenerOperation<IGpsMeasurementsListener> {
89        private final int mStatus;
90
91        public StatusChangedOperation(int status) {
92            mStatus = status;
93        }
94
95        @Override
96        public void execute(IGpsMeasurementsListener listener) throws RemoteException {
97            listener.onStatusChanged(mStatus);
98        }
99    }
100}
101