1/*
2 * Copyright (C) 2006-2011 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.am;
18
19import android.content.Context;
20import android.database.ContentObserver;
21import android.net.Uri;
22import android.os.Bundle;
23import android.provider.Settings;
24import android.provider.Settings.SettingNotFoundException;
25import android.util.Log;
26
27import java.util.HashMap;
28import java.util.Map;
29
30/**
31 * Helper class for watching a set of core settings which the framework
32 * propagates to application processes to avoid multiple lookups and potentially
33 * disk I/O operations. Note: This class assumes that all core settings reside
34 * in {@link Settings.Secure}.
35 */
36final class CoreSettingsObserver extends ContentObserver {
37    private static final String LOG_TAG = CoreSettingsObserver.class.getSimpleName();
38
39    // mapping form property name to its type
40    private static final Map<String, Class<?>> sSecureSettingToTypeMap = new HashMap<
41            String, Class<?>>();
42    private static final Map<String, Class<?>> sSystemSettingToTypeMap = new HashMap<
43            String, Class<?>>();
44    private static final Map<String, Class<?>> sGlobalSettingToTypeMap = new HashMap<
45            String, Class<?>>();
46    static {
47        sSecureSettingToTypeMap.put(Settings.Secure.LONG_PRESS_TIMEOUT, int.class);
48        // add other secure settings here...
49
50        sSystemSettingToTypeMap.put(Settings.System.TIME_12_24, String.class);
51        // add other system settings here...
52
53        sGlobalSettingToTypeMap.put(Settings.Global.DEBUG_VIEW_ATTRIBUTES, int.class);
54        // add other global settings here...
55    }
56
57    private final Bundle mCoreSettings = new Bundle();
58
59    private final ActivityManagerService mActivityManagerService;
60
61    public CoreSettingsObserver(ActivityManagerService activityManagerService) {
62        super(activityManagerService.mHandler);
63        mActivityManagerService = activityManagerService;
64        beginObserveCoreSettings();
65        sendCoreSettings();
66    }
67
68    public Bundle getCoreSettingsLocked() {
69        return (Bundle) mCoreSettings.clone();
70    }
71
72    @Override
73    public void onChange(boolean selfChange) {
74        synchronized (mActivityManagerService) {
75            sendCoreSettings();
76        }
77    }
78
79    private void sendCoreSettings() {
80        populateSettings(mCoreSettings, sSecureSettingToTypeMap);
81        populateSettings(mCoreSettings, sSystemSettingToTypeMap);
82        populateSettings(mCoreSettings, sGlobalSettingToTypeMap);
83        mActivityManagerService.onCoreSettingsChange(mCoreSettings);
84    }
85
86    private void beginObserveCoreSettings() {
87        for (String setting : sSecureSettingToTypeMap.keySet()) {
88            Uri uri = Settings.Secure.getUriFor(setting);
89            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
90                    uri, false, this);
91        }
92
93        for (String setting : sSystemSettingToTypeMap.keySet()) {
94            Uri uri = Settings.System.getUriFor(setting);
95            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
96                    uri, false, this);
97        }
98
99        for (String setting : sGlobalSettingToTypeMap.keySet()) {
100            Uri uri = Settings.Global.getUriFor(setting);
101            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
102                    uri, false, this);
103        }
104    }
105
106    private void populateSettings(Bundle snapshot, Map<String, Class<?>> map) {
107        Context context = mActivityManagerService.mContext;
108        for (Map.Entry<String, Class<?>> entry : map.entrySet()) {
109            String setting = entry.getKey();
110            Class<?> type = entry.getValue();
111            try {
112                if (type == String.class) {
113                    final String value;
114                    if (map == sSecureSettingToTypeMap) {
115                        value = Settings.Secure.getString(context.getContentResolver(), setting);
116                    } else if (map == sSystemSettingToTypeMap) {
117                        value = Settings.System.getString(context.getContentResolver(), setting);
118                    } else {
119                        value = Settings.Global.getString(context.getContentResolver(), setting);
120                    }
121                    snapshot.putString(setting, value);
122                } else if (type == int.class) {
123                    final int value;
124                    if (map == sSecureSettingToTypeMap) {
125                        value = Settings.Secure.getInt(context.getContentResolver(), setting);
126                    } else if (map == sSystemSettingToTypeMap) {
127                        value = Settings.System.getInt(context.getContentResolver(), setting);
128                    } else {
129                        value = Settings.Global.getInt(context.getContentResolver(), setting);
130                    }
131                    snapshot.putInt(setting, value);
132                } else if (type == float.class) {
133                    final float value;
134                    if (map == sSecureSettingToTypeMap) {
135                        value = Settings.Secure.getFloat(context.getContentResolver(), setting);
136                    } else if (map == sSystemSettingToTypeMap) {
137                        value = Settings.System.getFloat(context.getContentResolver(), setting);
138                    } else {
139                        value = Settings.Global.getFloat(context.getContentResolver(), setting);
140                    }
141                    snapshot.putFloat(setting, value);
142                } else if (type == long.class) {
143                    final long value;
144                    if (map == sSecureSettingToTypeMap) {
145                        value = Settings.Secure.getLong(context.getContentResolver(), setting);
146                    } else if (map == sSystemSettingToTypeMap) {
147                        value = Settings.System.getLong(context.getContentResolver(), setting);
148                    } else {
149                        value = Settings.Global.getLong(context.getContentResolver(), setting);
150                    }
151                    snapshot.putLong(setting, value);
152                }
153            } catch (SettingNotFoundException snfe) {
154                Log.w(LOG_TAG, "Cannot find setting \"" + setting + "\"", snfe);
155            }
156        }
157    }
158}
159