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
17package com.android.server;
18
19import com.android.internal.content.PackageMonitor;
20
21import android.content.ComponentName;
22import android.content.Context;
23import android.content.Intent;
24import android.content.pm.ResolveInfo;
25import android.content.pm.ServiceInfo;
26import android.content.pm.PackageManager.NameNotFoundException;
27import android.os.Binder;
28import android.provider.Settings;
29import android.speech.RecognitionService;
30import android.text.TextUtils;
31import android.util.Slog;
32
33import java.util.List;
34
35public class RecognitionManagerService extends Binder {
36    final static String TAG = "RecognitionManagerService";
37
38    final Context mContext;
39    final MyPackageMonitor mMonitor;
40
41    class MyPackageMonitor extends PackageMonitor {
42        public void onSomePackagesChanged() {
43            ComponentName comp = getCurRecognizer();
44            if (comp == null) {
45                if (anyPackagesAppearing()) {
46                    comp = findAvailRecognizer(null);
47                    if (comp != null) {
48                        setCurRecognizer(comp);
49                    }
50                }
51                return;
52            }
53
54            int change = isPackageDisappearing(comp.getPackageName());
55            if (change == PACKAGE_PERMANENT_CHANGE
56                    || change == PACKAGE_TEMPORARY_CHANGE) {
57                setCurRecognizer(findAvailRecognizer(null));
58
59            } else if (isPackageModified(comp.getPackageName())) {
60                setCurRecognizer(findAvailRecognizer(comp.getPackageName()));
61            }
62        }
63    }
64
65    RecognitionManagerService(Context context) {
66        mContext = context;
67        mMonitor = new MyPackageMonitor();
68        mMonitor.register(context, true);
69    }
70
71    public void systemReady() {
72        ComponentName comp = getCurRecognizer();
73        if (comp != null) {
74            // See if the current recognizer is no longer available.
75            try {
76                mContext.getPackageManager().getServiceInfo(comp, 0);
77            } catch (NameNotFoundException e) {
78                setCurRecognizer(null);
79            }
80        } else {
81            comp = findAvailRecognizer(null);
82            if (comp != null) {
83                setCurRecognizer(comp);
84            }
85        }
86    }
87
88    ComponentName findAvailRecognizer(String prefPackage) {
89        List<ResolveInfo> available =
90                mContext.getPackageManager().queryIntentServices(
91                        new Intent(RecognitionService.SERVICE_INTERFACE), 0);
92        int numAvailable = available.size();
93
94        if (numAvailable == 0) {
95            Slog.w(TAG, "no available voice recognition services found");
96            return null;
97        } else {
98            if (prefPackage != null) {
99                for (int i=0; i<numAvailable; i++) {
100                    ServiceInfo serviceInfo = available.get(i).serviceInfo;
101                    if (prefPackage.equals(serviceInfo.packageName)) {
102                        return new ComponentName(serviceInfo.packageName, serviceInfo.name);
103                    }
104                }
105            }
106            if (numAvailable > 1) {
107                Slog.w(TAG, "more than one voice recognition service found, picking first");
108            }
109
110            ServiceInfo serviceInfo = available.get(0).serviceInfo;
111            return new ComponentName(serviceInfo.packageName, serviceInfo.name);
112        }
113    }
114
115    ComponentName getCurRecognizer() {
116        String curRecognizer = Settings.Secure.getString(
117                mContext.getContentResolver(),
118                Settings.Secure.VOICE_RECOGNITION_SERVICE);
119        if (TextUtils.isEmpty(curRecognizer)) {
120            return null;
121        }
122        return ComponentName.unflattenFromString(curRecognizer);
123    }
124
125    void setCurRecognizer(ComponentName comp) {
126        Settings.Secure.putString(mContext.getContentResolver(),
127                Settings.Secure.VOICE_RECOGNITION_SERVICE,
128                comp != null ? comp.flattenToShortString() : "");
129    }
130}
131