00001 00002 // 00003 // XML storage classes version 1.5 00004 // 00005 // XMLFilterIterator.java 00006 // 00007 // Copyright (c) 2004, 2005, 2007, 2008, 2010 Martin Fuchs <martin-fuchs@gmx.net> 00008 // 00009 00010 00011 /* 00012 00013 All rights reserved. 00014 00015 Redistribution and use in source and binary forms, with or without 00016 modification, are permitted provided that the following conditions are met: 00017 00018 * Redistributions of source code must retain the above copyright 00019 notice, this list of conditions and the following disclaimer. 00020 * Redistributions in binary form must reproduce the above copyright 00021 notice, this list of conditions and the following disclaimer in 00022 the documentation and/or other materials provided with the 00023 distribution. 00024 00025 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00026 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00027 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00028 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00029 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00030 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00031 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00032 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00033 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00034 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00035 POSSIBILITY OF SUCH DAMAGE. 00036 00037 */ 00038 00039 package de.mfuchs.xmlstorage; 00040 00041 import java.util.Iterator; 00042 00043 /** 00044 * XMLFilterIterator<T> is used by XMLChildrenFilter and XMLStreamFilter 00045 * to filter node iterations. 00046 * @author Martin Fuchs 00047 */ 00048 public final class XMLFilterIterator<T extends AbstractXMLNode> implements Iterator<T> 00049 { 00050 public XMLFilterIterator(Iterator<T> it, final String filterName) 00051 { 00052 _it = it; 00053 _filterName = filterName; 00054 00055 _next = getNext(); 00056 searchNext(); 00057 } 00058 00059 public boolean hasNext() 00060 { 00061 return _next != null; 00062 } 00063 00064 public T next() 00065 { 00066 T ret = _next; 00067 00068 if (_next != null) { 00069 _next = getNext(); 00070 searchNext(); 00071 } 00072 00073 return ret; 00074 } 00075 00076 protected T getNext() 00077 { 00078 if (_it.hasNext()) 00079 return _it.next(); 00080 else 00081 return null; 00082 } 00083 00084 private Iterator<T> _it; 00085 private T _next; 00086 private String _filterName; 00087 00088 private void searchNext() 00089 { 00090 while(_next!=null && !_next.getName().equals(_filterName)) 00091 _next = getNext(); 00092 } 00093 00094 public void remove() 00095 { 00096 throw new UnsupportedOperationException("remove() not implemented for XMLFilterIterator"); 00097 } 00098 }