| /******************************************************************************* |
| * Copyright (c) 2005, 2007 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.utility.internal.iterators; |
| |
| import java.util.List; |
| import java.util.ListIterator; |
| import org.eclipse.jpt.utility.internal.StringTools; |
| |
| /** |
| * A <code>ReadOnlyListIterator</code> wraps another |
| * <code>ListIterator</code> and removes support for: |
| * #remove() |
| * #set(Object) |
| * #add(Object) |
| */ |
| public class ReadOnlyListIterator<E> |
| implements ListIterator<E> |
| { |
| private final ListIterator<? extends E> nestedListIterator; |
| |
| |
| /** |
| * Construct an iterator on the specified list that |
| * disallows removes, sets, and adds. |
| */ |
| public ReadOnlyListIterator(List<? extends E> list) { |
| this(list.listIterator()); |
| } |
| |
| /** |
| * Construct an iterator on the specified list iterator that |
| * disallows removes, sets, and adds. |
| */ |
| public ReadOnlyListIterator(ListIterator<? extends E> nestedListIterator) { |
| super(); |
| this.nestedListIterator = nestedListIterator; |
| } |
| |
| public boolean hasNext() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.hasNext(); |
| } |
| |
| public E next() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.next(); |
| } |
| |
| public boolean hasPrevious() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.hasPrevious(); |
| } |
| |
| public E previous() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.previous(); |
| } |
| |
| public int nextIndex() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.nextIndex(); |
| } |
| |
| public int previousIndex() { |
| // delegate to the nested iterator |
| return this.nestedListIterator.previousIndex(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void set(E o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void add(E o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String toString() { |
| return StringTools.buildToStringFor(this, this.nestedListIterator); |
| } |
| |
| } |