001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.type.it;
020
021import java.util.Enumeration;
022import java.util.Iterator;
023
024import lucee.runtime.type.Collection;
025import lucee.runtime.type.Collection.Key;
026
027/**
028 * Iterator Implementation for a Object Array
029 */
030public final class KeyIterator implements Iterator<Collection.Key>,Enumeration<Collection.Key> {
031        
032        private Collection.Key[] arr;
033        private int pos;
034
035        /**
036         * constructor for the class
037         * @param arr Base Array
038         */
039        public KeyIterator(Collection.Key[] arr) {
040                
041                this.arr=arr==null?new Collection.Key[0]:arr;
042                this.pos=0;
043        }
044
045        @Override
046        public void remove() {
047                throw new UnsupportedOperationException("this operation is not suppored");
048        }
049
050        @Override
051        public boolean hasNext() {
052                return (arr.length)>pos;
053        }
054
055        @Override
056        public Collection.Key next() {
057                Key key = arr[pos++];
058                if(key==null) return null;
059                return key;
060        }
061
062        public boolean hasMoreElements() {
063                return hasNext();
064        }
065
066        public Collection.Key nextElement() {
067                return next();
068        }
069}