| /******************************************************************************* |
| * Copyright (c) 2009 Oracle. 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: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal.iterators; |
| |
| import java.util.Iterator; |
| |
| import org.eclipse.jpt.common.utility.internal.Queue; |
| import org.eclipse.jpt.common.utility.internal.StringTools; |
| |
| /** |
| * A <code>QueueIterator</code> provides an {@link Iterator} |
| * for a {@link Queue} of objects of type <code>E</code>. The queue's elements |
| * are {@link Queue#dequeue() dequeue}d" as the iterator returns them with |
| * calls to {@link #next()}. |
| * |
| * @param <E> the type of elements returned by the iterator |
| * |
| * @see Queue |
| * @see org.eclipse.jpt.common.utility.internal.iterables.QueueIterable |
| */ |
| public class QueueIterator<E> |
| implements Iterator<E> |
| { |
| private final Queue<E> queue; |
| |
| |
| /** |
| * Construct an iterator for the specified queue. |
| */ |
| public QueueIterator(Queue<E> queue) { |
| super(); |
| this.queue = queue; |
| } |
| |
| public boolean hasNext() { |
| return ! this.queue.isEmpty(); |
| } |
| |
| public E next() { |
| return this.queue.dequeue(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String toString() { |
| return StringTools.buildToStringFor(this, this.queue); |
| } |
| |
| } |