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.ListIterator; 022import java.util.NoSuchElementException; 023 024import lucee.runtime.type.Array; 025 026 027public class ArrayListIteratorImpl implements ListIterator { 028 029 private static final int UNDEFINED = Integer.MIN_VALUE; 030 private Array array; 031 private int index=-1; 032 private int current=UNDEFINED; 033 034 /** 035 * Constructor of the class 036 * @param arr 037 * @param index 038 */ 039 public ArrayListIteratorImpl(Array array, int index){ 040 this.array=array; 041 this.index=index-1; 042 } 043 044 @Override 045 public void add(Object o) { 046 array.setEL((++index)+1,o); 047 } 048 049 public void remove() { 050 if(current==UNDEFINED)throw new IllegalStateException(); 051 array.removeEL(current+1); 052 current=UNDEFINED; 053 } 054 055 public void set(Object o) { 056 if(current==UNDEFINED) throw new IllegalStateException(); 057 array.setEL(current+1, o); 058 } 059 060///////////// 061 062 063 public boolean hasNext() { 064 return array.size()>index+1; 065 } 066 067 public boolean hasPrevious() { 068 return index>-1; 069 } 070 071 public int previousIndex() { 072 return index; 073 } 074 075 public int nextIndex() { 076 return index+1; 077 } 078 079 public Object previous() { 080 if(!hasPrevious()) 081 throw new NoSuchElementException(); 082 current=index; 083 return array.get((index--)+1,null); 084 } 085 086 public Object next() { 087 if(!hasNext()) 088 throw new NoSuchElementException(); 089 return array.get((current=++index)+1,null); 090 } 091 092}