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/*
* $Id: XMLStreamEventWriter.java,v 1.1 2004/07/05 23:16:16 cniles Exp $
*
* Copyright (c) 2004, Christian Niles, Unit12
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Christian Niles, Unit12, nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
package javanet.staxutils;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
import javanet.staxutils.events.ExtendedXMLEvent;
import javanet.staxutils.io.XMLWriterUtils;
/**
* {@link javax.xml.stream.XMLEventWriter} that writes events to a
* {@link XMLStreamWriter}.
*
* @author Christian Niles
* @version $Revision: 1.1 $
*/
public class XMLStreamEventWriter extends BaseXMLEventWriter {
/** The underlying stream. */
private XMLStreamWriter writer;
/**
* Constructs a XMLEventStreamWriter that writes events to the
* given stream.
*
* @param writer The {@link XMLStreamWriter} to which the events will be
* written.
*/
public XMLStreamEventWriter(XMLStreamWriter writer) {
super(null, writer.getNamespaceContext());
this.writer = writer;
}
public synchronized void flush() throws XMLStreamException {
super.flush();
// send any cached start element
if (savedStart != null) {
XMLWriterUtils.writeStartElement(savedStart, false, writer);
}
writer.flush();
}
public synchronized void close() throws XMLStreamException {
super.close();
writer.close();
}
/**
* Saved reference to most recent start element. This is used to properly
* write empty elements. Each startElement event is saved here until the
* next event is received, at which point it will be written as a start or
* empty element if it is followed directly by an EndElement.
*/
private StartElement savedStart;
protected synchronized void sendEvent(XMLEvent event)
throws XMLStreamException {
// Check if we have a cached start tag. If we do, then we should
// check if this event is actually an end tag, so we can properly
// write an empty element.
if (savedStart != null) {
StartElement start = savedStart;
savedStart = null;
if (event.getEventType() == XMLEvent.END_ELEMENT) {
// this end tag directly followed a start tag, so send
// the underlying writer an empty start element
XMLWriterUtils.writeStartElement(start, true, writer);
return;
} else {
// element has content, so send a regular start tag
XMLWriterUtils.writeStartElement(start, false, writer);
}
}
if (event.isStartElement()) {
// cache the event
savedStart = event.asStartElement();
} else if (event instanceof ExtendedXMLEvent) {
// let the event handle itself
((ExtendedXMLEvent) event).writeEvent(writer);
} else {
// write the event to the stream
XMLWriterUtils.writeEvent(event, writer);
}
}
}
