| /* |
| * Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.collections.iterators; |
| |
| import org.apache.commons.collections.OrderedMapIterator; |
| import org.apache.commons.collections.Unmodifiable; |
| |
| /** |
| * Decorates an ordered map iterator such that it cannot be modified. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:27 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class UnmodifiableOrderedMapIterator implements OrderedMapIterator, Unmodifiable { |
| |
| /** The iterator being decorated */ |
| private OrderedMapIterator iterator; |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Decorates the specified iterator such that it cannot be modified. |
| * |
| * @param iterator the iterator to decorate |
| * @throws IllegalArgumentException if the iterator is null |
| */ |
| public static OrderedMapIterator decorate(OrderedMapIterator iterator) { |
| if (iterator == null) { |
| throw new IllegalArgumentException("OrderedMapIterator must not be null"); |
| } |
| if (iterator instanceof Unmodifiable) { |
| return iterator; |
| } |
| return new UnmodifiableOrderedMapIterator(iterator); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Constructor. |
| * |
| * @param iterator the iterator to decorate |
| */ |
| private UnmodifiableOrderedMapIterator(OrderedMapIterator iterator) { |
| super(); |
| this.iterator = iterator; |
| } |
| |
| //----------------------------------------------------------------------- |
| public boolean hasNext() { |
| return iterator.hasNext(); |
| } |
| |
| public Object next() { |
| return iterator.next(); |
| } |
| |
| public boolean hasPrevious() { |
| return iterator.hasPrevious(); |
| } |
| |
| public Object previous() { |
| return iterator.previous(); |
| } |
| |
| public Object getKey() { |
| return iterator.getKey(); |
| } |
| |
| public Object getValue() { |
| return iterator.getValue(); |
| } |
| |
| public Object setValue(Object value) { |
| throw new UnsupportedOperationException("setValue() is not supported"); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException("remove() is not supported"); |
| } |
| |
| } |