XMLFilterIterator.java

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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 }