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.adapters;
018    
019    import java.util.ListIterator;
020    
021    import org.apache.commons.collections.primitives.ShortListIterator;
022    
023    /**
024     * Adapts a {@link Number}-valued {@link ListIterator ListIterator} 
025     * to the {@link ShortListIterator ShortListIterator} interface.
026     * <p />
027     * This implementation delegates most methods
028     * to the provided {@link ShortListIterator ShortListIterator} 
029     * implementation in the "obvious" way.
030     *
031     * @since Commons Primitives 1.0
032     * @version $Revision: 480462 $ $Date: 2006-11-29 09:15:00 +0100 (Wed, 29 Nov 2006) $
033     * @author Rodney Waldhoff 
034     */
035    public class ListIteratorShortListIterator implements ShortListIterator {
036            
037        /**
038         * Create an {@link ShortListIterator ShortListIterator} wrapping
039         * the specified {@link ListIterator ListIterator}.  When
040         * the given <i>iterator</i> is <code>null</code>,
041         * returns <code>null</code>.
042         * 
043         * @param iterator the (possibly <code>null</code>) 
044         *        {@link ListIterator ListIterator} to wrap
045         * @return an {@link ShortListIterator ShortListIterator} wrapping the given 
046         *         <i>iterator</i>, or <code>null</code> when <i>iterator</i> is
047         *         <code>null</code>.
048         */
049        public static ShortListIterator wrap(ListIterator iterator) {
050            return null == iterator ? null : new ListIteratorShortListIterator(iterator);
051        }    
052        
053        /**
054         * Creates an {@link ShortListIterator ShortListIterator} wrapping
055         * the specified {@link ListIterator ListIterator}.
056         * @see #wrap
057         */
058        public ListIteratorShortListIterator(ListIterator iterator) {
059            _iterator = iterator;
060        }
061        
062        public int nextIndex() {
063            return _iterator.nextIndex();
064        }
065    
066        public int previousIndex() {
067            return _iterator.previousIndex();
068        }
069    
070        public boolean hasNext() {
071            return _iterator.hasNext();
072        }
073    
074        public boolean hasPrevious() {
075            return _iterator.hasPrevious();
076        }
077        
078        public short next() {
079            return ((Number)_iterator.next()).shortValue();
080        }
081    
082        public short previous() {
083            return ((Number)_iterator.previous()).shortValue();
084        }
085    
086        public void add(short element) {
087            _iterator.add(new Short(element));
088        }
089          
090        public void set(short element) {
091            _iterator.set(new Short(element));
092        }
093    
094        public void remove() {
095            _iterator.remove();
096        }
097          
098        private ListIterator _iterator = null;
099    
100    }