/*
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* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
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* copy of this document.
*
* 2. 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.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED 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
* INTALIO, INC. OR ITS 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.
*
* Copyright 2001 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
* Date Author Changes
* 04/06/2001 Arnaud Blandin Created
*/
package org.exolab.castor.xml.util;
import java.util.HashSet;
import org.exolab.castor.types.AnyNode;
import org.exolab.castor.xml.EventProducer;
import org.exolab.castor.xml.Namespaces;
import org.xml.sax.DocumentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributeListImpl;
/**
* A class for converting an AnyNode to SAX events
* @author <a href="mailto:blandin@intalio.com">Arnaud Blandin</a>
* @version $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
*/
public class AnyNode2SAX implements EventProducer {
/** The AnyNode we are firing events for. */
private AnyNode _node;
/** The Document Handler. */
private DocumentHandler _handler;
/** The stack to store the elements. */
private HashSet _elements;
/** The namespace context. */
private Namespaces _context;
/**
* No-arg constructor.
*/
public AnyNode2SAX() {
this(null, null);
}
/**
* Creates a AnyNode2SAX for the given node.
* @param node the AnyNode to create AnyNode2SAX for.
*/
public AnyNode2SAX(final AnyNode node) {
this(node, null);
}
/**
* Creates a AnyNode2SAX for the given node and the namespace context.
* @param node the AnyNode to create AnyNode2SAX for.
* @param context a namespace context
*/
public AnyNode2SAX(final AnyNode node, final Namespaces context) {
_elements = new HashSet();
_node = node;
_context = (context == null) ? new Namespaces() : context;
}
/**
* Set the Document Handler
* @param handler the document handler to set
*/
public void setDocumentHandler(final DocumentHandler handler) {
if (handler == null) {
throw new IllegalArgumentException("AnyNode2SAX#setDocumentHandler 'null' value for handler");
}
_handler = handler;
}
public static void fireEvents(final AnyNode node, final DocumentHandler handler) throws SAXException {
fireEvents(node, handler, null);
}
public static void fireEvents(final AnyNode node,
final DocumentHandler handler, final Namespaces context) throws SAXException {
AnyNode2SAX eventProducer = new AnyNode2SAX(node, context);
eventProducer.setDocumentHandler(handler);
eventProducer.start();
}
public void start() throws org.xml.sax.SAXException {
if (_node == null || _handler == null) {
return;
}
processAnyNode(_node, _handler);
}
private void processAnyNode(final AnyNode node, final DocumentHandler handler)
throws SAXException {
if (node == null || handler == null) {
throw new IllegalArgumentException();
}
//-- so we don't potentially get into an endlessloop
if (!_elements.add(node)) {
return;
}
if (node.getNodeType() == AnyNode.ELEMENT) {
String name = node.getLocalName();
//-- retrieve the attributes and handle them
AttributeListImpl atts = new AttributeListImpl();
AnyNode tempNode = node.getFirstAttribute();
String xmlName = null;
String value = null;
String attUri = null;
String attPrefix = null;
while (tempNode != null) {
xmlName = tempNode.getLocalName();
//--retrieve a prefix?
attUri = tempNode.getNamespaceURI();
if (attUri != null) {
attPrefix = _context.getNamespacePrefix(attUri);
}
if (attPrefix != null && attPrefix.length() > 0) {
xmlName = attPrefix + ':' + xmlName;
}
value = tempNode.getStringValue();
atts.addAttribute(xmlName, "CDATA", value);
tempNode = tempNode.getNextSibling();
} //attributes
//-- namespace management
_context = _context.createNamespaces();
String nsPrefix = node.getNamespacePrefix();
String nsURI = node.getNamespaceURI();
//-- retrieve the namespaces declaration and handle them
tempNode = node.getFirstNamespace();
String prefix = null;
while (tempNode != null) {
prefix = tempNode.getNamespacePrefix();
value = tempNode.getNamespaceURI();
if (value != null && value.length() > 0) {
_context.addNamespace(prefix, value);
}
tempNode = tempNode.getNextSibling();
} //namespaceNode
String qName = null;
//maybe the namespace is already bound to a prefix in the
//namespace context
if (nsURI != null && nsURI.length() > 0) {
String tempPrefix = _context.getNamespacePrefix(nsURI);
if (tempPrefix != null) {
nsPrefix = tempPrefix;
} else {
_context.addNamespace(nsPrefix, nsURI);
}
}
if (nsPrefix != null) {
int len = nsPrefix.length();
if (len > 0) {
StringBuffer sb = new StringBuffer(len+name.length()+1);
sb.append(nsPrefix);
sb.append(':');
sb.append(name);
qName = sb.toString();
} else {
qName = name;
}
} else {
qName = name;
}
try {
_context.declareAsAttributes(atts,true);
handler.startElement(qName, atts);
} catch (SAXException sx) {
throw new SAXException(sx);
}
//-- handle child&daughter elements
tempNode = node.getFirstChild();
while (tempNode != null) {
processAnyNode(tempNode, handler);
tempNode = tempNode.getNextSibling();
}
//-- finish element
try {
handler.endElement(qName);
_context = _context.getParent();
} catch(org.xml.sax.SAXException sx) {
throw new SAXException(sx);
}
} else {
// ELEMENTS
if (node.getNodeType() == AnyNode.TEXT) {
String value = node.getStringValue();
if (value != null && value.length() > 0) {
char[] chars = value.toCharArray();
try {
handler.characters(chars, 0, chars.length);
} catch(org.xml.sax.SAXException sx) {
throw new SAXException(sx);
}
}
}
}
}
}