001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.shared.ldap.message;
021    
022    
023    import java.util.NoSuchElementException;
024    import javax.naming.NamingEnumeration;
025    
026    
027    /**
028     * A NamingEnumeration over an array of objects.
029     * 
030     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
031     * @version $Rev: 494173 $
032     */
033    public class ArrayNamingEnumeration<T> implements NamingEnumeration<T>
034    {
035        /** the objects to enumerate */
036        private final T[] objects;
037    
038        /** the index pointing into the array */
039        private int index = 0;
040    
041    
042        /**
043         * Creates a NamingEnumeration over an array of objects.
044         * 
045         * @param objects
046         *            the objects to enumerate over
047         */
048        public ArrayNamingEnumeration( T[] objects )
049        {
050            this.objects = objects;
051        }
052    
053    
054        public void close()
055        {
056            if ( objects != null )
057            {
058                index = objects.length;
059            }
060        }
061    
062    
063        public boolean hasMore()
064        {
065            if ( objects == null || objects.length == 0 )
066            {
067                return false;
068            }
069    
070            return index < objects.length;
071        }
072    
073    
074        public T next()
075        {
076            if ( objects == null || objects.length == 0 || index >= objects.length )
077            {
078                throw new NoSuchElementException();
079            }
080    
081            T retval = objects[index];
082            index++;
083            return retval;
084        }
085    
086    
087        public boolean hasMoreElements()
088        {
089            return hasMore();
090        }
091    
092    
093        public T nextElement()
094        {
095            return next();
096        }
097    }