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/*
* Copyright (C) 2019 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.documentsui;
import static com.android.documentsui.base.SharedMinimal.DEBUG;
import static com.android.documentsui.base.SharedMinimal.TAG;
import android.database.ContentObserver;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
/**
* A custom {@link ContentObserver} which constructed by a {@link ContentLock}
* and a {@link Runnable} callback. It will callback when it's onChange and ContentLock is unlock.
*/
public final class LockingContentObserver extends ContentObserver {
private final ContentLock mLock;
private final Runnable mContentChangedCallback;
public LockingContentObserver(ContentLock lock, Runnable contentChangedCallback) {
super(new Handler(Looper.getMainLooper()));
mLock = lock;
mContentChangedCallback = contentChangedCallback;
}
@Override
public boolean deliverSelfNotifications() {
return true;
}
@Override
public void onChange(boolean selfChange) {
if (DEBUG) {
Log.d(TAG, "Content updated.");
}
mLock.runWhenUnlocked(mContentChangedCallback);
}
}
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