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/*******************************************************************************
* Copyright (c) 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare.internal;
import java.util.*;
import org.eclipse.jface.operation.IRunnableWithProgress;
/**
* A work queue maintains a list of tasks that need to be run.
* If the same task is added multiple times, the last occurrence of
* the task will be run(i.e. the task will be removed from it's
* previous location and aded to the end of the queue.
*/
public class WorkQueue {
private List runnables = new ArrayList();
public boolean add(IRunnableWithProgress runnable) {
if (runnables.contains(runnable))
runnables.remove(runnable);
return runnables.add(runnable);
}
public void clear() {
runnables.clear();
}
public boolean contains(IRunnableWithProgress runnable) {
return runnables.contains(runnable);
}
public boolean isEmpty() {
return runnables.isEmpty();
}
public boolean remove(IRunnableWithProgress runnable) {
return runnables.remove(runnable);
}
public int size() {
return runnables.size();
}
public IRunnableWithProgress remove() {
return (IRunnableWithProgress)runnables.remove(0);
}
}
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