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      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 import java.util.HashMap;
     25 import 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  */
     33 final 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