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/*
* $Id: StAXEventContentHandler.java,v 1.5 2004/07/05 23:15:11 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 java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.Namespace;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.util.XMLEventConsumer;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* SAX ContentHandler that writes events to a StAX {@link XMLEventConsumer}.
*
* @author Christian Niles
* @version $Revision: 1.5 $
*/
public class StAXEventContentHandler extends StAXContentHandler {
/** The consumer to which events will be written. */
private XMLEventConsumer consumer;
/** The factory used to construct events. */
private XMLEventFactory eventFactory;
/**
* A stack of {@link List}s, each containing {@link Namespace}events
* constructed from a {@link StartElement}event. It is necessary to keep
* these namespaces so we can report them to the {@link EndElement}event.
*/
private List namespaceStack = new ArrayList();
/**
* Constructs a default instance with a default event factory. You must set
* the {@link XMLEventConsumer}via the
* {@link #setEventConsumer(XMLEventConsumer)}method.
*/
public StAXEventContentHandler() {
eventFactory = XMLEventFactory.newInstance();
}
/**
* Constructs an instance that writes events to the provided
* XMLEventConsumer. Events will be constructed from a default
* XMLEventFactory instance.
*
* @param consumer The {@link XMLEventConsumer}to which events will be
* written.
*/
public StAXEventContentHandler(XMLEventConsumer consumer) {
this.consumer = consumer;
eventFactory = XMLEventFactory.newInstance();
}
/**
* Constructs an instance that writes events constructed with the provided
* XMLEventFactory to the provided XMLEventConsumer
*
* @param consumer The {@link XMLEventConsumer} to which events will be
* written.
* @param factory The {@link XMLEventFactory} used to construct events. If
* null, a default instance will be constructed.
*/
public StAXEventContentHandler(XMLEventConsumer consumer,
XMLEventFactory factory) {
this.consumer = consumer;
if (factory != null) {
this.eventFactory = factory;
} else {
eventFactory = XMLEventFactory.newInstance();
}
}
/**
* Returns a reference to the {@link XMLEventConsumer} to which events will
* be written.
*
* @return The {@link XMLEventConsumer} to which events will be written.
*/
public XMLEventConsumer getEventConsumer() {
return consumer;
}
/**
* Sets the {@link XMLEventConsumer} to which events are written.
*
* @param consumer The {@link XMLEventConsumer} to which events will be
* written.
*/
public void setEventConsumer(XMLEventConsumer consumer) {
this.consumer = consumer;
}
/**
* Returns a reference to the {@link XMLEventFactory} used to construct
* events.
*
* @return The {@link XMLEventFactory} used to construct events.
*/
public XMLEventFactory getEventFactory() {
return eventFactory;
}
/**
* Sets the {@link XMLEventFactory} used to create events.
*
* @param factory The {@link XMLEventFactory} used to create events.
*/
public void setEventFactory(XMLEventFactory factory) {
this.eventFactory = factory;
}
public void startDocument() throws SAXException {
super.startDocument();
// clear the namespaces in case we ended in error before.
namespaceStack.clear();
eventFactory.setLocation(getCurrentLocation());
try {
consumer.add(eventFactory.createStartDocument());
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
public void endDocument() throws SAXException {
eventFactory.setLocation(getCurrentLocation());
try {
consumer.add(eventFactory.createEndDocument());
} catch (XMLStreamException e) {
throw new SAXException(e);
}
super.endDocument();
// clear the namespaces
namespaceStack.clear();
}
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
// set document location
eventFactory.setLocation(getCurrentLocation());
// create attribute and namespace events
Collection[] events = {null, null};
createStartEvents(attributes, events);
// save a reference to the namespace collection so we can use them
// again
// in the end element
namespaceStack.add(events[0]);
try {
String[] qname = {null, null};
parseQName(qName, qname);
consumer.add(eventFactory.createStartElement(qname[0], uri,
qname[1], events[1].iterator(), events[0].iterator()));
} catch (XMLStreamException e) {
throw new SAXException(e);
} finally {
super.startElement(uri, localName, qName, attributes);
}
}
public void endElement(String uri, String localName, String qName)
throws SAXException {
super.endElement(uri, localName, qName);
eventFactory.setLocation(getCurrentLocation());
// parse name
String[] qname = {null, null};
parseQName(qName, qname);
// get namespaces
Collection nsList = (Collection) namespaceStack.remove(namespaceStack.size() - 1);
Iterator nsIter = nsList.iterator();
try {
consumer.add(eventFactory.createEndElement(qname[0], uri, qname[1],
nsIter));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
public void comment(char[] ch, int start, int length) throws SAXException {
super.comment(ch, start, length);
eventFactory.setLocation(getCurrentLocation());
try {
consumer.add(eventFactory.createComment(new String(ch, start,
length)));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
public void characters(char[] ch, int start, int length)
throws SAXException {
super.characters(ch, start, length);
try {
if (!isCDATA) {
eventFactory.setLocation(getCurrentLocation());
consumer.add(eventFactory.createCharacters(new String(ch,
start, length)));
}
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
public void ignorableWhitespace(char[] ch, int start, int length)
throws SAXException {
super.ignorableWhitespace(ch, start, length);
characters(ch, start, length);
}
public void processingInstruction(String target, String data)
throws SAXException {
super.processingInstruction(target, data);
try {
consumer.add(eventFactory.createProcessingInstruction(target, data));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
}
public void endCDATA() throws SAXException {
eventFactory.setLocation(getCurrentLocation());
try {
consumer.add(eventFactory.createCData(CDATABuffer.toString()));
} catch (XMLStreamException e) {
throw new SAXException(e);
}
super.endCDATA();
}
/**
* Creates the {@link Namespace}and {@link Attribute}events associated
* with a {@link StartElement}.
*
* @param attributes The SAX attributes object.
* @param events An array used to return the two collections of
* {@link Namespace}and {@link Attribute}events. The
* namespaces will be placed at events[0] and the
* attributes as events[1].
*/
protected void createStartEvents(Attributes attributes, Collection[] events) {
Map nsMap = null;
List attrs = null;
// create namespaces
if (namespaces != null) {
Iterator prefixes = namespaces.getDeclaredPrefixes();
while (prefixes.hasNext()) {
String prefix = (String) prefixes.next();
String uri = namespaces.getNamespaceURI(prefix);
Namespace ns = createNamespace(prefix, uri);
if (nsMap == null) {
nsMap = new HashMap();
}
nsMap.put(prefix, ns);
}
}
// create attributes
String[] qname = {null, null};
for (int i = 0, s = attributes.getLength(); i < s; i++) {
parseQName(attributes.getQName(i), qname);
String attrPrefix = qname[0];
String attrLocal = qname[1];
String attrQName = attributes.getQName(i);
String attrValue = attributes.getValue(i);
String attrURI = attributes.getURI(i);
if ("xmlns".equals(attrQName) || "xmlns".equals(attrPrefix)) {
// namespace declaration disguised as an attribute. If the
// namespace has already been declared, skip it, otherwise
// write it as an namespace
if (!nsMap.containsKey(attrPrefix)) {
Namespace ns = createNamespace(attrPrefix, attrValue);
if (nsMap == null) {
nsMap = new HashMap();
}
nsMap.put(attrPrefix, ns);
}
} else {
Attribute attribute;
if (attrPrefix.length() > 0) {
attribute = eventFactory.createAttribute(attrPrefix,
attrURI, attrLocal, attrValue);
} else {
attribute = eventFactory.createAttribute(attrLocal,
attrValue);
}
if (attrs == null) {
attrs = new ArrayList();
}
attrs.add(attribute);
}
}
events[0] = (nsMap == null ? Collections.EMPTY_LIST : nsMap.values());
events[1] = (attrs == null ? Collections.EMPTY_LIST : attrs);
}
protected Namespace createNamespace(String prefix, String uri) {
if (prefix == null || prefix.length() == 0) {
return eventFactory.createNamespace(uri);
} else {
return eventFactory.createNamespace(prefix, uri);
}
}
}
