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/*
* $Id: StreamEventWriter.java,v 1.4 2004/07/15 02:09:59 cniles Exp $
*
* Copyright (c) 2004, Christian Niles, unit12.net
* 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.io;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import javanet.staxutils.BaseXMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
/**
* {@link javax.xml.stream.XMLEventWriter} that writes events to a character stream
* using {@link XMLEvent#writeAsEncodedUnicode(Writer)}.
*
* @author Christian Niles
* @version $Revision: 1.4 $
*/
public class StreamEventWriter extends BaseXMLEventWriter {
/** The underlying {@link Writer}. */
private Writer writer;
/**
* Constructs a new StreamEventWriter that writes to a file.
*
* @param file The file to write.
* @throws IOException If the file couldn't be opened.
*/
public StreamEventWriter(File file) throws IOException {
this(new FileWriter(file));
}
/**
* Constructs a new StreamEventWriter that writes to a binary
* stream.
*
* @param os The stream to write.
*/
public StreamEventWriter(OutputStream os) {
this(new OutputStreamWriter(os));
}
/**
* Constructs a new StreamEventWriter that writes to a character
* stream.
*
* @param writer The stream to write.
*/
public StreamEventWriter(Writer writer) {
this.writer = writer;
}
public synchronized void flush() throws XMLStreamException {
super.flush();
try {
writer.flush();
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
/**
* 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 void sendEvent(XMLEvent event) throws XMLStreamException {
try {
// 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);
writer.flush();
return;
} else {
// element has content, so send a regular start tag
XMLWriterUtils.writeStartElement(start, false, writer);
}
}
if (event.isStartElement()) {
savedStart = event.asStartElement();
} else {
event.writeAsEncodedUnicode(writer);
}
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
}
