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/* $Id: XMLStreamReaderToContentHandler.java,v 1.6 2006/01/23 18:50:02 sandoz 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 javanet.staxutils.helpers.XMLFilterImplEx;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.Location;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.AttributesImpl;
/**
* This is a simple utility class that adapts StAX events from an
* {@link javax.xml.stream.XMLStreamReader} to SAX events on a
* {@link org.xml.sax.ContentHandler}, bridging between the two
* parser technologies.
*
* @author [email protected]
* @version 1.0
*/
public class XMLStreamReaderToContentHandler implements StAXReaderToContentHandler {
// StAX event source
private final XMLStreamReader staxStreamReader;
// SAX event sinks
private XMLFilterImplEx filter;
/**
* Construct a new StAX to SAX adapter that will convert a StAX event
* stream into a SAX event stream.
*
* @param staxCore
* StAX event source
* @param filter
* SAX event sink
*/
public XMLStreamReaderToContentHandler(XMLStreamReader staxCore,
XMLFilterImplEx filter) {
staxStreamReader = staxCore;
this.filter = filter;
}
/*
* @see StAXReaderToContentHandler#bridge()
*/
public void bridge() throws XMLStreamException {
try {
// remembers the nest level of elements to know when we are done.
int depth=0;
boolean isDocument = false;
handleStartDocument();
// if the parser is at the start document, procees any comments or PIs
int event = staxStreamReader.getEventType();
if (event == XMLStreamConstants.START_DOCUMENT) {
isDocument = true;
event=staxStreamReader.next();
while (event != XMLStreamConstants.START_ELEMENT) {
switch(event) {
case XMLStreamConstants.COMMENT :
handleComment();
break;
case XMLStreamConstants.PROCESSING_INSTRUCTION :
handlePI();
break;
}
event = staxStreamReader.next();
};
}
if( event!=XMLStreamConstants.START_ELEMENT)
throw new IllegalStateException("The current event is not START_ELEMENT\n but" + event);
do {
// These are all of the events listed in the javadoc for
// XMLEvent.
// The spec only really describes 11 of them.
switch (event) {
case XMLStreamConstants.START_ELEMENT :
depth++;
handleStartElement();
break;
case XMLStreamConstants.END_ELEMENT :
handleEndElement();
depth--;
break;
case XMLStreamConstants.CHARACTERS :
handleCharacters();
break;
case XMLStreamConstants.ENTITY_REFERENCE :
handleEntityReference();
break;
case XMLStreamConstants.PROCESSING_INSTRUCTION :
handlePI();
break;
case XMLStreamConstants.COMMENT :
handleComment();
break;
case XMLStreamConstants.DTD :
handleDTD();
break;
case XMLStreamConstants.ATTRIBUTE :
handleAttribute();
break;
case XMLStreamConstants.NAMESPACE :
handleNamespace();
break;
case XMLStreamConstants.CDATA :
handleCDATA();
break;
case XMLStreamConstants.ENTITY_DECLARATION :
handleEntityDecl();
break;
case XMLStreamConstants.NOTATION_DECLARATION :
handleNotationDecl();
break;
case XMLStreamConstants.SPACE :
handleSpace();
break;
default :
throw new InternalError("processing event: " + event);
}
event=staxStreamReader.next();
} while (depth!=0);
// procees any remaining comments or PIs
if (isDocument) {
while(event != XMLStreamConstants.END_DOCUMENT) {
switch(event) {
case XMLStreamConstants.COMMENT :
handleComment();
break;
case XMLStreamConstants.PROCESSING_INSTRUCTION :
handlePI();
break;
}
event=staxStreamReader.next();
}
}
handleEndDocument();
} catch (SAXException e) {
throw new XMLStreamException(e);
}
}
private void handleEndDocument() throws SAXException {
filter.endDocument();
}
private void handleStartDocument() throws SAXException {
final Location location = staxStreamReader.getLocation();
if (location != null) {
filter.setDocumentLocator(new Locator() {
public int getColumnNumber() {
return location.getColumnNumber();
}
public int getLineNumber() {
return location.getLineNumber();
}
public String getPublicId() {
return location.getPublicId();
}
public String getSystemId() {
return location.getSystemId();
}
});
} else {
filter.setDocumentLocator(new DummyLocator());
}
filter.startDocument();
}
private void handlePI() throws XMLStreamException {
try {
filter.processingInstruction(
staxStreamReader.getPITarget(),
staxStreamReader.getPIData());
} catch (SAXException e) {
throw new XMLStreamException(e);
}
}
private void handleCharacters() throws XMLStreamException {
// workaround for bugid 5046319 - switch over to commented section
// below when it is fixed.
int textLength = staxStreamReader.getTextLength();
int textStart = staxStreamReader.getTextStart();
char[] chars = new char[textLength];
staxStreamReader.getTextCharacters(textStart, chars, 0, textLength);
try {
filter.characters(chars, 0, chars.length);
} catch (SAXException e) {
throw new XMLStreamException(e);
}
// int start = 0;
// int len;
// do {
// len = staxStreamReader.getTextCharacters(start, buf, 0, buf.length);
// start += len;
// try {
// filter.characters(buf, 0, len);
// } catch (SAXException e) {
// throw new XMLStreamException(e);
// }
// } while (len == buf.length);
}
private void handleEndElement() throws XMLStreamException {
QName qName = staxStreamReader.getName();
try {
// fire endElement
String prefix = qName.getPrefix();
String rawname;
if(prefix==null || prefix.length()==0)
rawname = qName.getLocalPart();
else
rawname = prefix + ':' + qName.getLocalPart();
filter.endElement(
qName.getNamespaceURI(),
qName.getLocalPart(),
rawname);
// end namespace bindings
int nsCount = staxStreamReader.getNamespaceCount();
for (int i = nsCount - 1; i >= 0; i--) {
String nsprefix = staxStreamReader.getNamespacePrefix(i);
if (nsprefix == null) { // true for default namespace
nsprefix = "";
}
filter.endPrefixMapping(nsprefix);
}
} catch (SAXException e) {
throw new XMLStreamException(e);
}
}
private void handleStartElement() throws XMLStreamException {
try {
// start namespace bindings
int nsCount = staxStreamReader.getNamespaceCount();
for (int i = 0; i < nsCount; i++) {
String uri = staxStreamReader.getNamespaceURI(i);
if (uri == null) {
uri = "";
}
String prefix = staxStreamReader.getNamespacePrefix(i);
if (prefix == null) { // true for default namespace
prefix = "";
}
filter.startPrefixMapping(
prefix,
uri);
}
// fire startElement
QName qName = staxStreamReader.getName();
String prefix = qName.getPrefix();
String rawname;
if(prefix==null || prefix.length()==0)
rawname = qName.getLocalPart();
else
rawname = prefix + ':' + qName.getLocalPart();
Attributes attrs = getAttributes();
filter.startElement(
qName.getNamespaceURI(),
qName.getLocalPart(),
rawname,
attrs);
} catch (SAXException e) {
throw new XMLStreamException(e);
}
}
/**
* Get the attributes associated with the given START_ELEMENT or ATTRIBUTE
* StAXevent.
*
* @return the StAX attributes converted to an org.xml.sax.Attributes
*/
private Attributes getAttributes() {
AttributesImpl attrs = new AttributesImpl();
int eventType = staxStreamReader.getEventType();
if (eventType != XMLStreamConstants.ATTRIBUTE
&& eventType != XMLStreamConstants.START_ELEMENT) {
throw new InternalError(
"getAttributes() attempting to process: " + eventType);
}
// Add namspace declarations if required
if (filter.getNamespacePrefixes()) {
for (int i = 0; i < staxStreamReader.getNamespaceCount(); i++) {
String uri = staxStreamReader.getNamespaceURI(i);
if (uri==null) uri="";
String prefix = staxStreamReader.getNamespacePrefix(i);
if (prefix==null) prefix="";
String qName = "xmlns";
if (prefix.length() == 0) {
prefix = qName;
} else {
qName = qName + ':' + prefix;
}
attrs.addAttribute("http://www.w3.org/2000/xmlns/", prefix, qName, "CDATA", uri);
}
}
// gather non-namespace attrs
for (int i = 0; i < staxStreamReader.getAttributeCount(); i++) {
String uri = staxStreamReader.getAttributeNamespace(i);
if(uri==null) uri="";
String localName = staxStreamReader.getAttributeLocalName(i);
String prefix = staxStreamReader.getAttributePrefix(i);
String qName;
if(prefix==null || prefix.length()==0)
qName = localName;
else
qName = prefix + ':' + localName;
String type = staxStreamReader.getAttributeType(i);
String value = staxStreamReader.getAttributeValue(i);
attrs.addAttribute(uri, localName, qName, type, value);
}
return attrs;
}
private void handleNamespace() {
// no-op ???
// namespace events don't normally occur outside of a startElement
// or endElement
}
private void handleAttribute() {
// no-op ???
// attribute events don't normally occur outside of a startElement
// or endElement
}
private void handleDTD() {
// no-op ???
// it seems like we need to pass this info along, but how?
}
private void handleComment() throws XMLStreamException {
int textLength = staxStreamReader.getTextLength();
int textStart = staxStreamReader.getTextStart();
char[] chars = new char[textLength];
staxStreamReader.getTextCharacters(textStart, chars, 0, textLength);
try {
filter.comment(chars, 0, textLength);
} catch (SAXException e) {
throw new XMLStreamException(e);
}
}
private void handleEntityReference() {
// no-op ???
}
private void handleSpace() {
// no-op ???
// this event is listed in the javadoc, but not in the spec.
}
private void handleNotationDecl() {
// no-op ???
// this event is listed in the javadoc, but not in the spec.
}
private void handleEntityDecl() {
// no-op ???
// this event is listed in the javadoc, but not in the spec.
}
private void handleCDATA() {
// no-op ???
// this event is listed in the javadoc, but not in the spec.
}
}