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/* $Id: ContentHandlerToXMLEventWriter.java,v 1.4 2005/10/25 18:36:24 ryan_shoemaker Exp $
*
* Copyright (c) 2004, Sun Microsystems, Inc.
* 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 Sun Microsystems, Inc. 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 java.util.HashMap;
import java.util.Stack;
import javax.xml.stream.Location;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Characters;
import org.xml.sax.Attributes;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* This is a simple utility class that adapts SAX events into StAX
* {@link javax.xml.stream.XMLEventWriter} events, bridging between
* the two parser technologies.
*
* This ContentHandler does not own the XMLEventWriter. Therefore, it will
* not close or flush the writer at any point.
*
* @author [email protected]
* @version 1.0
*/
public class ContentHandlerToXMLEventWriter extends DefaultHandler {
// SAX events will be sent to this XMLEventWriter
private final XMLEventWriter staxWriter;
// factory for StAX events
private final XMLEventFactory staxEventFactory;
// SAX locator
private Locator locator = null;
// StAX location
private Location location = null;
// storage for prefix bindings
private final Stack prefixBindings;
// name to entity decl map
// map
private final HashMap entityMap;
public ContentHandlerToXMLEventWriter(XMLEventWriter staxCore) {
this.staxWriter = staxCore;
staxEventFactory = XMLEventFactory.newInstance();
prefixBindings = new Stack(); // default of 10 seems reasonable
entityMap = new HashMap();
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#endDocument()
*/
public void endDocument() throws SAXException {
try {
staxWriter.add(staxEventFactory.createEndDocument());
staxWriter.flush();
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#startDocument()
*/
public void startDocument() throws SAXException {
try {
staxWriter.add(staxEventFactory.createStartDocument());
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#characters(char[], int, int)
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
try {
// TODO: is there a way to reuse an event?
Characters event = staxEventFactory.createCharacters(
new String(ch,start,length));
staxWriter.add(event);
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
*/
public void ignorableWhitespace(char[] ch, int start, int length)
throws SAXException {
characters(ch,start,length);
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#endPrefixMapping(java.lang.String)
*/
public void endPrefixMapping(String prefix) throws SAXException {
// TODO: no-op?
// I think we can ignore these SAX events because StAX
// automatically scopes the prefix bindings.
}
public void unparsedEntityDecl(String name, String publicId, String systemId, String notationName) throws SAXException {
// store unparsed entity decls so we can report them properly in skippedEntity
entityMap.put(name, new EntityDeclarationImpl(location, name, publicId, systemId, notationName, null));
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#skippedEntity(java.lang.String)
*/
public void skippedEntity(String name) throws SAXException {
try {
// if the entity isn't knows, then pass null through
// for the EntityDeclaration
staxWriter.add(staxEventFactory.createEntityReference(name,
(EntityDeclarationImpl)entityMap.get(name)));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#setDocumentLocator(org.xml.sax.Locator)
*/
public void setDocumentLocator(final Locator locator) {
this.locator = locator;
staxEventFactory.setLocation( new Location() {
public int getLineNumber() { return locator.getLineNumber(); }
public int getColumnNumber() { return locator.getColumnNumber(); }
public int getCharacterOffset() { return -1; }
public String getPublicId() { return locator.getPublicId(); }
public String getSystemId() { return locator.getSystemId(); }
});
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#processingInstruction(java.lang.String,
* java.lang.String)
*/
public void processingInstruction(String target, String data)
throws SAXException {
try {
staxWriter.add(
staxEventFactory.createProcessingInstruction(target, data));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#startPrefixMapping(java.lang.String,
* java.lang.String)
*/
public void startPrefixMapping(String prefix, String uri)
throws SAXException {
if (prefix.equals("xml")) {
return;
}
// defend against parsers that pass null in for "xmlns" prefix
if (prefix == null) {
prefix = "";
}
prefixBindings.add(prefix);
prefixBindings.add(uri);
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#endElement(java.lang.String,
* java.lang.String, java.lang.String)
*/
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
try {
// TODO: is this all we have to do?
staxWriter
.add(
staxEventFactory.createEndElement(
getPrefix(qName),
namespaceURI,
localName));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.xml.sax.ContentHandler#startElement(java.lang.String,
* java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
public void startElement(
String namespaceURI,
String localName,
String qName,
Attributes atts)
throws SAXException {
try {
staxWriter.add(
staxEventFactory.createStartElement(
getPrefix(qName),
namespaceURI,
localName));
String uri, prefix;
while (prefixBindings.size() != 0) {
uri = (String)prefixBindings.pop();
prefix = (String)prefixBindings.pop();
if (prefix.length() == 0) {
staxWriter.setDefaultNamespace(uri);
} else {
staxWriter.setPrefix(prefix, uri);
}
// this method handles "", null, and "xmlns" prefixes properly
if( prefix == null || "".equals(prefix) || "xmlns".equals(prefix) ) {
staxWriter.add(staxEventFactory.createNamespace(uri));
} else {
staxWriter.add(staxEventFactory.createNamespace(prefix, uri));
}
}
writeAttributes(atts);
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
/**
* Generate a StAX writeAttribute event for each attribute
*
* @param atts
* attributes from the SAX event
*/
private void writeAttributes(Attributes atts) throws XMLStreamException {
for (int i = 0; i < atts.getLength(); i++) {
final String prefix = getPrefix(atts.getQName(i));
if(!prefix.equals("xmlns")) { // defend againts broken transformers that report xmlns decls as attrs
staxWriter.add(
staxEventFactory.createAttribute(
prefix,
atts.getURI(i),
atts.getLocalName(i),
atts.getValue(i)));
}
}
}
/**
* Pull the prefix off of the specified QName.
*
* @param qName
* the QName
* @return the prefix or the empty string if it doesn't exist.
*/
private String getPrefix(String qName) {
int idx = qName.indexOf(':');
if (idx == -1) {
return "";
} else {
return qName.substring(0, idx);
}
}
}
