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/*
* Copyright (C) 2006-2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.am;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.Log;
import java.util.HashMap;
import java.util.Map;
/**
* Helper class for watching a set of core settings which the framework
* propagates to application processes to avoid multiple lookups and potentially
* disk I/O operations. Note: This class assumes that all core settings reside
* in {@link Settings.Secure}.
*/
final class CoreSettingsObserver extends ContentObserver {
private static final String LOG_TAG = CoreSettingsObserver.class.getSimpleName();
// mapping form property name to its type
private static final Map<String, Class<?>> sCoreSettingToTypeMap = new HashMap<
String, Class<?>>();
static {
sCoreSettingToTypeMap.put(Settings.Secure.LONG_PRESS_TIMEOUT, int.class);
// add other core settings here...
}
private final Bundle mCoreSettings = new Bundle();
private final ActivityManagerService mActivityManagerService;
public CoreSettingsObserver(ActivityManagerService activityManagerService) {
super(activityManagerService.mHandler);
mActivityManagerService = activityManagerService;
beginObserveCoreSettings();
sendCoreSettings();
}
public Bundle getCoreSettingsLocked() {
return (Bundle) mCoreSettings.clone();
}
@Override
public void onChange(boolean selfChange) {
synchronized (mActivityManagerService) {
sendCoreSettings();
}
}
private void sendCoreSettings() {
populateCoreSettings(mCoreSettings);
mActivityManagerService.onCoreSettingsChange(mCoreSettings);
}
private void beginObserveCoreSettings() {
for (String setting : sCoreSettingToTypeMap.keySet()) {
Uri uri = Settings.Secure.getUriFor(setting);
mActivityManagerService.mContext.getContentResolver().registerContentObserver(
uri, false, this);
}
}
private void populateCoreSettings(Bundle snapshot) {
Context context = mActivityManagerService.mContext;
for (Map.Entry<String, Class<?>> entry : sCoreSettingToTypeMap.entrySet()) {
String setting = entry.getKey();
Class<?> type = entry.getValue();
try {
if (type == String.class) {
String value = Settings.Secure.getString(context.getContentResolver(),
setting);
snapshot.putString(setting, value);
} else if (type == int.class) {
int value = Settings.Secure.getInt(context.getContentResolver(),
setting);
snapshot.putInt(setting, value);
} else if (type == float.class) {
float value = Settings.Secure.getFloat(context.getContentResolver(),
setting);
snapshot.putFloat(setting, value);
} else if (type == long.class) {
long value = Settings.Secure.getLong(context.getContentResolver(),
setting);
snapshot.putLong(setting, value);
}
} catch (SettingNotFoundException snfe) {
Log.w(LOG_TAG, "Cannot find setting \"" + setting + "\"", snfe);
}
}
}
}
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