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.GnssMeasurementsEvent;
20import android.location.IGnssMeasurementsListener;
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 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