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.util;
021    
022    
023    import java.util.Enumeration;
024    import java.util.NoSuchElementException;
025    
026    
027    /**
028     * An enumeration wrapper around an array.
029     * 
030     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
031     * @version $Rev: 596943 $
032     */
033    public class ArrayEnumeration implements Enumeration
034    {
035        /** the index into the array */
036        private int index = 0;
037    
038        /** Underlying array that is wrapped */
039        private final Object[] array;
040    
041    
042        /**
043         * Constructs an enumeration by wrapping an array.
044         * 
045         * @param array
046         *            the underlying array that is wrapped
047         */
048        public ArrayEnumeration(Object[] array)
049        {
050            if ( array != null )
051            {
052                this.array = new Object[ array.length ];
053                System.arraycopy( array, 0, this.array, 0, array.length );
054            } else {
055                this.array = null;
056            }
057        }
058    
059    
060        public final boolean hasMoreElements()
061        {
062            return array != null && array.length != 0 && index < array.length;
063        }
064    
065    
066        public Object nextElement()
067        {
068            if ( !hasMoreElements() )
069            {
070                throw new NoSuchElementException( "no more objects in array" );
071            }
072    
073            return array[index++];
074        }
075    }