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/*
* Oreka -- A media capture and retrieval platform
*
* Copyright (C) 2005, orecx LLC
*
* http://www.orecx.com
*
* This program is free software, distributed under the terms of
* the GNU General Public License.
* Please refer to http://www.gnu.org/copyleft/gpl.html
*
*/
package net.sf.oreka.serializers;
import java.io.ByteArrayOutputStream;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import net.sf.oreka.OrkException;
import net.sf.oreka.OrkObject;
import net.sf.oreka.OrkObjectFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
public class DomSerializer extends OrkSerializer {
Node node = null;
Document document = null;
public OrkObject deSerialize(Node node) throws OrkException
{
if (node == null)
{
throw (new OrkException("DomSerializer: null node was passed in"));
}
this.node = node;
deserialize = true; // Set DeSerialize mode
OrkObject obj = OrkObjectFactory.instance().newOrkObject(node.getNodeName());
obj.define(this);
obj.validate();
return obj;
}
public void serialize(Document document, Node node, OrkObject object) throws OrkException {
if (node == null) {
throw ( new OrkException("DomSerializer: passed DOM node is null"));
}
if (document == null) {
throw ( new OrkException("DomSerializer: passed DOM document is null"));
}
this.document = document;
this.node = node;
deserialize = false; // Set Serialize mode
object.define(this);
}
@Override
public void addClassName(String value) {
// TODO Auto-generated method stub
}
@Override
void addString(String key, String value) {
Element newElem = document.createElement(key);
node.appendChild(newElem);
Text newText = document.createTextNode(value);
newElem.appendChild(newText);
}
@Override
String getString(String key, String oldValue, boolean required) throws OrkException {
String value = null;
// Find the right node
Node stringNode = findElementByName(node, key);
if(stringNode != null)
{
// Now, the string associated to element should be the first child (text element)
Node textNode = stringNode.getFirstChild();
if (textNode != null && textNode.getNodeType() == Node.TEXT_NODE) {
value = textNode.getNodeValue().trim();
}
}
if (value == null) {
if (required) {
throw(new OrkException("DomSerializer::GetString: required parameter missing:" + key));
}
value = oldValue;
}
return value;
}
@Override
public OrkObject objectValue(String key, OrkObject value, boolean required) throws OrkException {
if (deserialize) {
return getObject(key, value, required);
}
else {
addObject(key, value);
return value;
}
}
void addObject(String key, OrkObject value) throws OrkException {
Element newElem = document.createElement(key);
node.appendChild(newElem);
DomSerializer ser = new DomSerializer();
ser.serialize(document, newElem, value);
}
OrkObject getObject(String key, OrkObject oldValue, boolean required) throws OrkException {
OrkObject value = null;
// Find the node corresponding to the object wanting to be populated
Node objectNode = findElementByName(node, key);
// Create a new serializer and affect it to this object
if (objectNode != null)
{
DomSerializer serializer = new DomSerializer();
value = serializer.deSerialize(objectNode);
}
if (value == null) {
if (required) {
throw(new OrkException("DomSerializer.getObject: required node missing:" + key));
}
value = oldValue;
}
return value;
}
public Node findElementByName(Node node, String name)
{
Node child = node.getFirstChild();
while(child != null)
{
if (child.getNodeName().equalsIgnoreCase(name) && child.getNodeType() == Node.ELEMENT_NODE)
{
return child;
}
child = child.getNextSibling();
}
return null;
}
public static byte[] nodeToByteArray(Node node) throws TransformerException {
TransformerFactory xformerFactory = TransformerFactory.newInstance();
Transformer xformer = xformerFactory.newTransformer();
xformer.setOutputProperty("indent", "yes");
ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
Result output = new StreamResult(byteArray);
DOMSource source = new DOMSource(node);
xformer.transform(source,output);
return byteArray.toByteArray();
}
}
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