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/*
* Copyright (C) 2017 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.internal.telephony;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Handler;
import android.telephony.Rlog;
import java.util.HashMap;
import java.util.Map;
/**
* The class to describe settings observer
*/
public class SettingsObserver extends ContentObserver {
private final Map<Uri, Integer> mUriEventMap;
private final Context mContext;
private final Handler mHandler;
private static final String TAG = "SettingsObserver";
public SettingsObserver(Context context, Handler handler) {
super(null);
mUriEventMap = new HashMap<>();
mContext = context;
mHandler = handler;
}
/**
* Start observing a content.
* @param uri Content URI
* @param what The event to fire if the content changes
*/
public void observe(Uri uri, int what) {
mUriEventMap.put(uri, what);
final ContentResolver resolver = mContext.getContentResolver();
resolver.registerContentObserver(uri, false, this);
}
/**
* Stop observing a content.
*/
public void unobserve() {
final ContentResolver resolver = mContext.getContentResolver();
resolver.unregisterContentObserver(this);
}
@Override
public void onChange(boolean selfChange) {
Rlog.e(TAG, "Should never be reached.");
}
@Override
public void onChange(boolean selfChange, Uri uri) {
final Integer what = mUriEventMap.get(uri);
if (what != null) {
mHandler.obtainMessage(what.intValue()).sendToTarget();
} else {
Rlog.e(TAG, "No matching event to send for URI=" + uri);
}
}
}
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