001/* 002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * bstefanescu 018 * 019 * $Id$ 020 */ 021 022package org.nuxeo.ecm.core.api.model.impl; 023 024import java.util.Iterator; 025import java.util.NoSuchElementException; 026 027import org.nuxeo.ecm.core.api.model.Property; 028 029/** 030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> 031 */ 032public class DirtyPropertyIterator implements Iterator<Property> { 033 034 private final Iterator<Property> it; 035 036 private Property property; // the current property - null if no intialized 037 038 private Property next; // the last seen property by hasNext() - null if no initialized 039 040 public DirtyPropertyIterator(Iterator<Property> it) { 041 this.it = it; 042 } 043 044 @Override 045 public boolean hasNext() { 046 if (next != null) { 047 return true; 048 } 049 while (it.hasNext()) { 050 next = it.next(); 051 if (next.isDirty()) { 052 return true; 053 } 054 } 055 next = null; 056 return false; 057 } 058 059 @Override 060 public Property next() { 061 if (!hasNext()) { 062 throw new NoSuchElementException("No more elements to iterate over"); 063 } 064 property = next; 065 next = null; 066 return property; 067 } 068 069 @Override 070 public void remove() { 071 if (property == null) { 072 throw new IllegalStateException("Cannot call remove on a non initialized iterator"); 073 } 074 property.remove(); 075 } 076 077}