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 
17 package com.android.server.am;
18 
19 import android.content.Context;
20 import android.database.ContentObserver;
21 import android.net.Uri;
22 import android.os.Bundle;
23 import android.provider.Settings;
24 
25 import com.android.internal.annotations.VisibleForTesting;
26 
27 import java.util.HashMap;
28 import 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  */
36 final class CoreSettingsObserver extends ContentObserver {
37     private static final String LOG_TAG = CoreSettingsObserver.class.getSimpleName();
38 
39     // mapping form property name to its type
40     @VisibleForTesting
41     static final Map<String, Class<?>> sSecureSettingToTypeMap = new HashMap<
42             String, Class<?>>();
43     @VisibleForTesting
44     static final Map<String, Class<?>> sSystemSettingToTypeMap = new HashMap<
45             String, Class<?>>();
46     @VisibleForTesting
47     static final Map<String, Class<?>> sGlobalSettingToTypeMap = new HashMap<
48             String, Class<?>>();
49     static {
sSecureSettingToTypeMap.put(Settings.Secure.LONG_PRESS_TIMEOUT, int.class)50         sSecureSettingToTypeMap.put(Settings.Secure.LONG_PRESS_TIMEOUT, int.class);
sSecureSettingToTypeMap.put(Settings.Secure.MULTI_PRESS_TIMEOUT, int.class)51         sSecureSettingToTypeMap.put(Settings.Secure.MULTI_PRESS_TIMEOUT, int.class);
52         // add other secure settings here...
53 
sSystemSettingToTypeMap.put(Settings.System.TIME_12_24, String.class)54         sSystemSettingToTypeMap.put(Settings.System.TIME_12_24, String.class);
55         // add other system settings here...
56 
sGlobalSettingToTypeMap.put(Settings.Global.DEBUG_VIEW_ATTRIBUTES, int.class)57         sGlobalSettingToTypeMap.put(Settings.Global.DEBUG_VIEW_ATTRIBUTES, int.class);
58         // add other global settings here...
59     }
60 
61     private final Bundle mCoreSettings = new Bundle();
62 
63     private final ActivityManagerService mActivityManagerService;
64 
CoreSettingsObserver(ActivityManagerService activityManagerService)65     public CoreSettingsObserver(ActivityManagerService activityManagerService) {
66         super(activityManagerService.mHandler);
67         mActivityManagerService = activityManagerService;
68         beginObserveCoreSettings();
69         sendCoreSettings();
70     }
71 
getCoreSettingsLocked()72     public Bundle getCoreSettingsLocked() {
73         return (Bundle) mCoreSettings.clone();
74     }
75 
76     @Override
onChange(boolean selfChange)77     public void onChange(boolean selfChange) {
78         synchronized (mActivityManagerService) {
79             sendCoreSettings();
80         }
81     }
82 
sendCoreSettings()83     private void sendCoreSettings() {
84         populateSettings(mCoreSettings, sSecureSettingToTypeMap);
85         populateSettings(mCoreSettings, sSystemSettingToTypeMap);
86         populateSettings(mCoreSettings, sGlobalSettingToTypeMap);
87         mActivityManagerService.onCoreSettingsChange(mCoreSettings);
88     }
89 
beginObserveCoreSettings()90     private void beginObserveCoreSettings() {
91         for (String setting : sSecureSettingToTypeMap.keySet()) {
92             Uri uri = Settings.Secure.getUriFor(setting);
93             mActivityManagerService.mContext.getContentResolver().registerContentObserver(
94                     uri, false, this);
95         }
96 
97         for (String setting : sSystemSettingToTypeMap.keySet()) {
98             Uri uri = Settings.System.getUriFor(setting);
99             mActivityManagerService.mContext.getContentResolver().registerContentObserver(
100                     uri, false, this);
101         }
102 
103         for (String setting : sGlobalSettingToTypeMap.keySet()) {
104             Uri uri = Settings.Global.getUriFor(setting);
105             mActivityManagerService.mContext.getContentResolver().registerContentObserver(
106                     uri, false, this);
107         }
108     }
109 
110     @VisibleForTesting
populateSettings(Bundle snapshot, Map<String, Class<?>> map)111     void populateSettings(Bundle snapshot, Map<String, Class<?>> map) {
112         Context context = mActivityManagerService.mContext;
113         for (Map.Entry<String, Class<?>> entry : map.entrySet()) {
114             String setting = entry.getKey();
115             final String value;
116             if (map == sSecureSettingToTypeMap) {
117                 value = Settings.Secure.getString(context.getContentResolver(), setting);
118             } else if (map == sSystemSettingToTypeMap) {
119                 value = Settings.System.getString(context.getContentResolver(), setting);
120             } else {
121                 value = Settings.Global.getString(context.getContentResolver(), setting);
122             }
123             if (value == null) {
124                 continue;
125             }
126             Class<?> type = entry.getValue();
127             if (type == String.class) {
128                 snapshot.putString(setting, value);
129             } else if (type == int.class) {
130                 snapshot.putInt(setting, Integer.parseInt(value));
131             } else if (type == float.class) {
132                 snapshot.putFloat(setting, Float.parseFloat(value));
133             } else if (type == long.class) {
134                 snapshot.putLong(setting, Long.parseLong(value));
135             }
136         }
137     }
138 }
139