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/*
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*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
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*
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*/
/*
* $Id: EventFilterSupport.java,v 1.4 2010-11-02 19:54:55 joehw Exp $
* %W% %E%
*/
package com.sun.xml.internal.stream;
import java.util.NoSuchElementException;
import javax.xml.stream.EventFilter;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
import javax.xml.stream.util.EventReaderDelegate;
/**
*
* @author Neeraj Bajaj, Sun Microsystems
*
*/
public class EventFilterSupport extends EventReaderDelegate {
//maintain a reference to EventFilter
EventFilter fEventFilter ;
/** Creates a new instance of EventFilterSupport */
public EventFilterSupport(XMLEventReader eventReader, EventFilter eventFilter) {
setParent(eventReader);
fEventFilter = eventFilter;
}
public Object next(){
try{
return nextEvent();
}catch(XMLStreamException ex){
throw new NoSuchElementException();
}
}
public boolean hasNext(){
try{
return peek() != null ? true : false ;
}catch(XMLStreamException ex){
return false;
}
}
public XMLEvent nextEvent()throws XMLStreamException{
if(super.hasNext()){
//get the next event by calling XMLEventReader
XMLEvent event = super.nextEvent();
//if this filter accepts this event then return this event
if(fEventFilter.accept(event)){
return event;
}
else{
return nextEvent();
}
}else{
throw new NoSuchElementException();
}
}//nextEvent()
public XMLEvent nextTag() throws XMLStreamException{
if(super.hasNext()){
XMLEvent event = super.nextTag();
//if the filter accepts this event return this event.
if(fEventFilter.accept(event)){
return event;
}
else{
return nextTag();
}
}else{
throw new NoSuchElementException();
}
}
public XMLEvent peek() throws XMLStreamException{
while (true) {
XMLEvent event = super.peek();
if(event == null)return null;
//if the filter accepts this event return this event.
if(fEventFilter.accept(event)){
return event;
}
//call super.next(), and then peek again.
super.next();
}
}
}//EventFilterSupport