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/*
* Copyright (C) 2010 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.quicksearchbox.util;
import android.database.DataSetObservable;
import android.os.Handler;
/**
* A version of {@link DataSetObservable} that performs callbacks on given {@link Handler}.
*/
public class AsyncDataSetObservable extends DataSetObservable {
private final Handler mHandler;
private final Runnable mChangedRunnable = new Runnable() {
public void run() {
AsyncDataSetObservable.super.notifyChanged();
}
};
private final Runnable mInvalidatedRunnable = new Runnable() {
public void run() {
AsyncDataSetObservable.super.notifyInvalidated();
}
};
/**
* @param handler Handler to run callbacks on.
*/
public AsyncDataSetObservable(Handler handler) {
mHandler = handler;
}
@Override
public void notifyChanged() {
if (mHandler == null) {
super.notifyChanged();
} else {
mHandler.post(mChangedRunnable);
}
}
@Override
public void notifyInvalidated() {
if (mHandler == null) {
super.notifyInvalidated();
} else {
mHandler.post(mInvalidatedRunnable);
}
}
}
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