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/*
* Copyright (C) 2014 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.systemui.recents;
import android.content.Context;
/**
* A ref counted trigger that does some logic when the count is first incremented, or last
* decremented. Not thread safe as it's not currently needed.
*/
public class ReferenceCountedTrigger {
Context mContext;
int mCount;
Runnable mFirstIncRunnable;
Runnable mLastDecRunnable;
Runnable mErrorRunnable;
// Convenience runnables
Runnable mIncrementRunnable = new Runnable() {
@Override
public void run() {
increment();
}
};
Runnable mDecrementRunnable = new Runnable() {
@Override
public void run() {
decrement();
}
};
public ReferenceCountedTrigger(Context context, Runnable firstIncRunnable,
Runnable lastDecRunnable, Runnable errorRunanable) {
mContext = context;
mFirstIncRunnable = firstIncRunnable;
mLastDecRunnable = lastDecRunnable;
mErrorRunnable = errorRunanable;
}
/** Increments the ref count */
public void increment() {
if (mCount == 0 && mFirstIncRunnable != null) {
mFirstIncRunnable.run();
}
mCount++;
}
/** Convenience method to increment this trigger as a runnable */
public Runnable incrementAsRunnable() {
return mIncrementRunnable;
}
/** Decrements the ref count */
public void decrement() {
mCount--;
if (mCount == 0 && mLastDecRunnable != null) {
mLastDecRunnable.run();
} else if (mCount < 0) {
if (mErrorRunnable != null) {
mErrorRunnable.run();
} else {
new Throwable("Invalid ref count").printStackTrace();
Console.logError(mContext, "Invalid ref count");
}
}
}
/** Convenience method to decrement this trigger as a runnable */
public Runnable decrementAsRunnable() {
return mDecrementRunnable;
}
/** Returns the current ref count */
public int getCount() {
return mCount;
}
}
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