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/*
* SAX2DOMEx.java
*
* Created on February 22, 2002, 1:55 PM
*/
package com.sun.xml.bind.marshaller;
import java.util.Stack;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import com.sun.xml.bind.util.Which;
import com.sun.istack.FinalArrayList;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
/**
* Builds a DOM tree from SAX2 events.
*
* @author Vivek Pandey
* @since 1.0
*/
public class SAX2DOMEx implements ContentHandler {
private Node node = null;
private boolean isConsolidate;
protected final Stack nodeStack = new Stack();
private final FinalArrayList unprocessedNamespaces = new FinalArrayList();
/**
* Document object that owns the specified node.
*/
protected final Document document;
/**
* @param node
* Nodes will be created and added under this object.
*/
public SAX2DOMEx(Node node) {
this(node, false);
}
/**
* @param node
* Nodes will be created and added under this object.
*/
public SAX2DOMEx(Node node, boolean isConsolidate) {
this.node = node;
this.isConsolidate = isConsolidate;
nodeStack.push(this.node);
if (node instanceof Document) {
this.document = (Document) node;
} else {
this.document = node.getOwnerDocument();
}
}
/**
* Creates a fresh empty DOM document and adds nodes under this document.
*/
public SAX2DOMEx() throws ParserConfigurationException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
factory.setValidating(false);
document = factory.newDocumentBuilder().newDocument();
node = document;
nodeStack.push(document);
}
public final Element getCurrentElement() {
return (Element) nodeStack.peek();
}
public Node getDOM() {
return node;
}
public void startDocument() {
}
public void endDocument() {
}
protected void namespace(Element element, String prefix, String uri) {
String qname;
if ("".equals(prefix) || prefix == null) {
qname = "xmlns";
} else {
qname = "xmlns:" + prefix;
}
// older version of Xerces (I confirmed that the bug is gone with Xerces 2.4.0)
// have a problem of re-setting the same namespace attribute twice.
// work around this bug removing it first.
if (element.hasAttributeNS("http://www.w3.org/2000/xmlns/", qname)) {
// further workaround for an old Crimson bug where the removeAttribtueNS
// method throws NPE when the element doesn't have any attribute.
// to be on the safe side, check the existence of attributes before
// attempting to remove it.
// for details about this bug, see org.apache.crimson.tree.ElementNode2
// line 540 or the following message:
// https://jaxb.dev.java.net/servlets/ReadMsg?list=users&msgNo=2767
element.removeAttributeNS("http://www.w3.org/2000/xmlns/", qname);
}
// workaround until here
element.setAttributeNS("http://www.w3.org/2000/xmlns/", qname, uri);
}
public void startElement(String namespace, String localName, String qName, Attributes attrs) {
Node parent = nodeStack.peek();
// some broken DOM implementatino (we confirmed it with SAXON)
// return null from this method.
Element element = document.createElementNS(namespace, qName);
if (element == null) {
// if so, report an user-friendly error message,
// rather than dying mysteriously with NPE.
throw new AssertionError(
Messages.format(Messages.DOM_IMPL_DOESNT_SUPPORT_CREATELEMENTNS,
document.getClass().getName(),
Which.which(document.getClass())));
}
// process namespace bindings
for (int i = 0; i < unprocessedNamespaces.size(); i += 2) {
String prefix = unprocessedNamespaces.get(i + 0);
String uri = unprocessedNamespaces.get(i + 1);
namespace(element, prefix, uri);
}
unprocessedNamespaces.clear();
if (attrs != null) {
int length = attrs.getLength();
for (int i = 0; i < length; i++) {
String namespaceuri = attrs.getURI(i);
String value = attrs.getValue(i);
String qname = attrs.getQName(i);
element.setAttributeNS(namespaceuri, qname, value);
}
}
// append this new node onto current stack node
parent.appendChild(element);
// push this node onto stack
nodeStack.push(element);
}
public void endElement(String namespace, String localName, String qName) {
nodeStack.pop();
}
public void characters(char[] ch, int start, int length) {
characters(new String(ch, start, length));
}
protected Text characters(String s) {
Node parent = nodeStack.peek();
Node lastChild = parent.getLastChild();
Text text;
if (isConsolidate && lastChild != null && lastChild.getNodeType() == Node.TEXT_NODE) {
text = (Text) lastChild;
text.appendData(s);
} else {
text = document.createTextNode(s);
parent.appendChild(text);
}
return text;
}
public void ignorableWhitespace(char[] ch, int start, int length) {
}
public void processingInstruction(String target, String data) throws org.xml.sax.SAXException {
Node parent = nodeStack.peek();
Node n = document.createProcessingInstruction(target, data);
parent.appendChild(n);
}
public void setDocumentLocator(Locator locator) {
}
public void skippedEntity(String name) {
}
public void startPrefixMapping(String prefix, String uri) {
unprocessedNamespaces.add(prefix);
unprocessedNamespaces.add(uri);
}
public void endPrefixMapping(String prefix) {
}
}
