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     */
017    package org.apache.commons.collections.primitives.decorators;
018    
019    import org.apache.commons.collections.primitives.CharListIterator;
020    
021    /**
022     * 
023     * @since Commons Primitives 1.0
024     * @version $Revision: 480463 $ $Date: 2006-11-29 09:15:23 +0100 (Wed, 29 Nov 2006) $
025     * 
026     * @author Rodney Waldhoff 
027     */
028    public final class UnmodifiableCharListIterator extends ProxyCharListIterator {
029        UnmodifiableCharListIterator(CharListIterator iterator) {
030            this.proxied = iterator;
031        }
032        
033        public void remove() {
034            throw new UnsupportedOperationException("This CharListIterator is not modifiable.");
035        }
036    
037        public void add(char value) {
038            throw new UnsupportedOperationException("This CharListIterator is not modifiable.");
039        }
040    
041        public void set(char value) {
042            throw new UnsupportedOperationException("This CharListIterator is not modifiable.");
043        }
044    
045        protected CharListIterator getListIterator() {
046            return proxied;   
047        }
048        
049        
050        public static final CharListIterator wrap(CharListIterator iterator) {
051            if(null == iterator) {
052                return null; 
053            } else if(iterator instanceof UnmodifiableCharListIterator) {
054                return iterator;
055            } else {
056                return new UnmodifiableCharListIterator(iterator);
057            }
058        }
059    
060        private CharListIterator proxied = null;    
061    }