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The core XML data binding framework with support for marshalling Java objects to
and unmarshalling from XML documents.
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package org.exolab.castor.xml.util;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.w3c.dom.Text;
import org.xml.sax.AttributeList;
import org.xml.sax.HandlerBase;
import org.xml.sax.SAXException;
import java.util.Stack;
/**
* A class for converting a SAX events to DOM nodes.
*
* @author Andrew Fawcett
*/
public class SAX2DOMHandler extends HandlerBase {
private final Node _node;
private final Stack _parents = new Stack();
/**
* Creates new instance of {@link SAX2DOMHandler} class.
*
* @param node the DOM node to use
*/
public SAX2DOMHandler(Node node) {
_node = node;
}
@Override
public void startElement(final String name, final AttributeList attributes) {
Node parent = !_parents.isEmpty() ? _parents.peek() : _node;
final Document document = getDocument(parent);
Element element = document.createElement(name);
int length = attributes.getLength();
for (int i = 0; i < length; i++) {
element.setAttribute(attributes.getName(i), attributes.getValue(i));
}
parent.appendChild(element);
_parents.push(element);
}
@Override
public void characters(final char[] chars, final int offset, final int length) {
String data = new String(chars, offset, length);
Node parent = !_parents.isEmpty() ? _parents.peek() : _node;
Node last = parent.getLastChild();
if ((last != null) && (last.getNodeType() == Node.TEXT_NODE)) {
((Text) last).appendData(data);
} else {
Text text = parent.getOwnerDocument().createTextNode(data);
parent.appendChild(text);
}
}
@Override
public void endElement(final String name) {
_parents.pop();
}
@Override
public void processingInstruction(String target, String data) throws SAXException {
// adds the given processing instruction to the document root
Document document = getDocument(_node);
ProcessingInstruction instruction = document.createProcessingInstruction(target, data);
document.insertBefore(instruction, document.getFirstChild());
}
/**
* Returns the owning {@link Document} for the given {@link Node}.
*
* @param node A given node.
* @return the owning {@link Document} for the give node.
*/
private Document getDocument(Node node) {
Document document;
if (node instanceof Document) {
document = (Document) node;
} else {
document = node.getOwnerDocument();
}
return document;
}
}