| /******************************************************************************* |
| * Copyright (c) 2006, 2017 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.compare.internal; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| 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<IRunnableWithProgress> 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 runnables.remove(0); |
| } |
| |
| |
| } |