001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.collections.primitives.decorators;
018
019import org.apache.commons.collections.primitives.ShortListIterator;
020
021/**
022 * 
023 * @since Commons Primitives 1.0
024 * @version $Revision: 480463 $ $Date: 2006-11-29 03:15:23 -0500 (Wed, 29 Nov 2006) $
025 * 
026 * @author Rodney Waldhoff 
027 */
028public final class UnmodifiableShortListIterator extends ProxyShortListIterator {
029    UnmodifiableShortListIterator(ShortListIterator iterator) {
030        this.proxied = iterator;
031    }
032    
033    public void remove() {
034        throw new UnsupportedOperationException("This ShortListIterator is not modifiable.");
035    }
036
037    public void add(short value) {
038        throw new UnsupportedOperationException("This ShortListIterator is not modifiable.");
039    }
040
041    public void set(short value) {
042        throw new UnsupportedOperationException("This ShortListIterator is not modifiable.");
043    }
044
045    protected ShortListIterator getListIterator() {
046        return proxied;   
047    }
048    
049    
050    public static final ShortListIterator wrap(ShortListIterator iterator) {
051        if(null == iterator) {
052            return null; 
053        } else if(iterator instanceof UnmodifiableShortListIterator) {
054            return iterator;
055        } else {
056            return new UnmodifiableShortListIterator(iterator);
057        }
058    }
059
060    private ShortListIterator proxied = null;    
061}