001/* 002 * HA-JDBC: High-Availability JDBC 003 * Copyright (C) 2012 Paul Ferraro 004 * 005 * This program is free software: you can redistribute it and/or modify 006 * it under the terms of the GNU Lesser General Public License as published by 007 * the Free Software Foundation, either version 3 of the License, or 008 * (at your option) any later version. 009 * 010 * This program 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 013 * GNU Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public License 016 * along with this program. If not, see <http://www.gnu.org/licenses/>. 017 */ 018package net.sf.hajdbc.util; 019 020import java.util.Iterator; 021import java.util.List; 022import java.util.ListIterator; 023 024/** 025 * An iterable facade for a list whose iterator operates in reverse order. 026 * @author Paul Ferraro 027 */ 028public class Reversed<T> implements Iterable<T> 029{ 030 private final List<T> list; 031 032 public Reversed(List<T> list) 033 { 034 this.list = list; 035 } 036 037 /** 038 * {@inheritDoc} 039 * @see java.lang.Iterable#iterator() 040 */ 041 @Override 042 public Iterator<T> iterator() 043 { 044 final ListIterator<T> iterator = this.list.listIterator(this.list.size()); 045 046 return new Iterator<T>() 047 { 048 @Override 049 public boolean hasNext() 050 { 051 return iterator.hasPrevious(); 052 } 053 054 @Override 055 public T next() 056 { 057 return iterator.previous(); 058 } 059 060 @Override 061 public void remove() 062 { 063 iterator.remove(); 064 } 065 }; 066 } 067}