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 java.util.HashMap;
25import java.util.Map;
26
27/**
28 * Helper class for watching a set of core settings which the framework
29 * propagates to application processes to avoid multiple lookups and potentially
30 * disk I/O operations. Note: This class assumes that all core settings reside
31 * in {@link Settings.Secure}.
32 */
33final class CoreSettingsObserver extends ContentObserver {
34    private static final String LOG_TAG = CoreSettingsObserver.class.getSimpleName();
35
36    // mapping form property name to its type
37    private static final Map<String, Class<?>> sSecureSettingToTypeMap = new HashMap<
38            String, Class<?>>();
39    private static final Map<String, Class<?>> sSystemSettingToTypeMap = new HashMap<
40            String, Class<?>>();
41    private static final Map<String, Class<?>> sGlobalSettingToTypeMap = new HashMap<
42            String, Class<?>>();
43    static {
44        sSecureSettingToTypeMap.put(Settings.Secure.LONG_PRESS_TIMEOUT, int.class);
45        // add other secure settings here...
46
47        sSystemSettingToTypeMap.put(Settings.System.TIME_12_24, String.class);
48        // add other system settings here...
49
50        sGlobalSettingToTypeMap.put(Settings.Global.DEBUG_VIEW_ATTRIBUTES, int.class);
51        // add other global settings here...
52    }
53
54    private final Bundle mCoreSettings = new Bundle();
55
56    private final ActivityManagerService mActivityManagerService;
57
58    public CoreSettingsObserver(ActivityManagerService activityManagerService) {
59        super(activityManagerService.mHandler);
60        mActivityManagerService = activityManagerService;
61        beginObserveCoreSettings();
62        sendCoreSettings();
63    }
64
65    public Bundle getCoreSettingsLocked() {
66        return (Bundle) mCoreSettings.clone();
67    }
68
69    @Override
70    public void onChange(boolean selfChange) {
71        synchronized (mActivityManagerService) {
72            sendCoreSettings();
73        }
74    }
75
76    private void sendCoreSettings() {
77        populateSettings(mCoreSettings, sSecureSettingToTypeMap);
78        populateSettings(mCoreSettings, sSystemSettingToTypeMap);
79        populateSettings(mCoreSettings, sGlobalSettingToTypeMap);
80        mActivityManagerService.onCoreSettingsChange(mCoreSettings);
81    }
82
83    private void beginObserveCoreSettings() {
84        for (String setting : sSecureSettingToTypeMap.keySet()) {
85            Uri uri = Settings.Secure.getUriFor(setting);
86            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
87                    uri, false, this);
88        }
89
90        for (String setting : sSystemSettingToTypeMap.keySet()) {
91            Uri uri = Settings.System.getUriFor(setting);
92            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
93                    uri, false, this);
94        }
95
96        for (String setting : sGlobalSettingToTypeMap.keySet()) {
97            Uri uri = Settings.Global.getUriFor(setting);
98            mActivityManagerService.mContext.getContentResolver().registerContentObserver(
99                    uri, false, this);
100        }
101    }
102
103    private void populateSettings(Bundle snapshot, Map<String, Class<?>> map) {
104        Context context = mActivityManagerService.mContext;
105        for (Map.Entry<String, Class<?>> entry : map.entrySet()) {
106            String setting = entry.getKey();
107            Class<?> type = entry.getValue();
108            if (type == String.class) {
109                final String value;
110                if (map == sSecureSettingToTypeMap) {
111                    value = Settings.Secure.getString(context.getContentResolver(), setting);
112                } else if (map == sSystemSettingToTypeMap) {
113                    value = Settings.System.getString(context.getContentResolver(), setting);
114                } else {
115                    value = Settings.Global.getString(context.getContentResolver(), setting);
116                }
117                snapshot.putString(setting, value);
118            } else if (type == int.class) {
119                final int value;
120                if (map == sSecureSettingToTypeMap) {
121                    value = Settings.Secure.getInt(context.getContentResolver(), setting, 0);
122                } else if (map == sSystemSettingToTypeMap) {
123                    value = Settings.System.getInt(context.getContentResolver(), setting, 0);
124                } else {
125                    value = Settings.Global.getInt(context.getContentResolver(), setting, 0);
126                }
127                snapshot.putInt(setting, value);
128            } else if (type == float.class) {
129                final float value;
130                if (map == sSecureSettingToTypeMap) {
131                    value = Settings.Secure.getFloat(context.getContentResolver(), setting, 0);
132                } else if (map == sSystemSettingToTypeMap) {
133                    value = Settings.System.getFloat(context.getContentResolver(), setting, 0);
134                } else {
135                    value = Settings.Global.getFloat(context.getContentResolver(), setting, 0);
136                }
137                snapshot.putFloat(setting, value);
138            } else if (type == long.class) {
139                final long value;
140                if (map == sSecureSettingToTypeMap) {
141                    value = Settings.Secure.getLong(context.getContentResolver(), setting, 0);
142                } else if (map == sSystemSettingToTypeMap) {
143                    value = Settings.System.getLong(context.getContentResolver(), setting, 0);
144                } else {
145                    value = Settings.Global.getLong(context.getContentResolver(), setting, 0);
146                }
147                snapshot.putLong(setting, value);
148            }
149        }
150    }
151}
152