| /******************************************************************************* |
| * Copyright (c) 2010 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.ArrayList; |
| import java.util.Iterator; |
| import org.eclipse.jpt.common.utility.internal.CollectionTools; |
| import org.eclipse.jpt.common.utility.internal.StringTools; |
| |
| /** |
| * A <code>ReverseIterator</code> wraps another {@link Iterator} and returns |
| * its elements in the reverse order in which the wrapped {@link Iterator} |
| * returns the elements. |
| * |
| * @param <E> the type of elements returned by the iterator |
| */ |
| public class ReverseIterator<E> |
| implements Iterator<E> |
| { |
| /** |
| * The elements in this iterator are already reversed. |
| */ |
| private final Iterator<E> iterator; |
| |
| |
| /** |
| * Construct a reverse iterator for the specified iterator. |
| */ |
| public ReverseIterator(Iterator<E> iterator) { |
| this(CollectionTools.reverseList(iterator)); |
| } |
| |
| /** |
| * Construct a reverse iterator for the specified iterator. |
| */ |
| public ReverseIterator(Iterator<E> iterator, int size) { |
| this(CollectionTools.reverseList(iterator, size)); |
| } |
| |
| /** |
| * Construct a reverse iterator for the specified iterable. |
| */ |
| public ReverseIterator(Iterable<E> iterable) { |
| this(CollectionTools.reverseList(iterable)); |
| } |
| |
| /** |
| * Construct a reverse iterator for the specified iterable. |
| */ |
| public ReverseIterator(Iterable<E> iterable, int size) { |
| this(CollectionTools.reverseList(iterable, size)); |
| } |
| |
| private ReverseIterator(ArrayList<E> reverseList) { |
| super(); |
| this.iterator = reverseList.iterator(); |
| } |
| |
| public boolean hasNext() { |
| return this.iterator.hasNext(); |
| } |
| |
| public E next() { |
| return this.iterator.next(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String toString() { |
| return StringTools.buildToStringFor(this); |
| } |
| } |