/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: SAX2DOM.java,v 1.20 2005/05/20 15:30:23 mkwan Exp $
*/
package org.apache.xalan.xsltc.trax;
import java.util.Stack;
import java.util.Vector;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.xalan.xsltc.runtime.Constants;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import org.w3c.dom.ProcessingInstruction;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
/**
* @author G. Todd Miller
*/
public class SAX2DOM implements ContentHandler, LexicalHandler, Constants {
private Node _root = null;
private Document _document = null;
private Node _nextSibling = null;
private Stack _nodeStk = new Stack();
private Vector _namespaceDecls = null;
private Node _lastSibling = null;
public SAX2DOM() throws ParserConfigurationException {
final DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
_document = factory.newDocumentBuilder().newDocument();
_root = _document;
}
public SAX2DOM(Node root, Node nextSibling) throws ParserConfigurationException {
_root = root;
if (root instanceof Document) {
_document = (Document)root;
}
else if (root != null) {
_document = root.getOwnerDocument();
}
else {
final DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
_document = factory.newDocumentBuilder().newDocument();
_root = _document;
}
_nextSibling = nextSibling;
}
public SAX2DOM(Node root) throws ParserConfigurationException {
this(root, null);
}
public Node getDOM() {
return _root;
}
public void characters(char[] ch, int start, int length) {
final Node last = (Node)_nodeStk.peek();
// No text nodes can be children of root (DOM006 exception)
if (last != _document) {
final String text = new String(ch, start, length);
if( _lastSibling != null && _lastSibling.getNodeType() == Node.TEXT_NODE ){
((Text)_lastSibling).appendData(text);
}
else if (last == _root && _nextSibling != null) {
_lastSibling = last.insertBefore(_document.createTextNode(text), _nextSibling);
}
else {
_lastSibling = last.appendChild(_document.createTextNode(text));
}
}
}
public void startDocument() {
_nodeStk.push(_root);
}
public void endDocument() {
_nodeStk.pop();
}
public void startElement(String namespace, String localName, String qName,
Attributes attrs)
{
final Element tmp = (Element)_document.createElementNS(namespace, qName);
// Add namespace declarations first
if (_namespaceDecls != null) {
final int nDecls = _namespaceDecls.size();
for (int i = 0; i < nDecls; i++) {
final String prefix = (String) _namespaceDecls.elementAt(i++);
if (prefix == null || prefix.equals(EMPTYSTRING)) {
tmp.setAttributeNS(XMLNS_URI, XMLNS_PREFIX,
(String) _namespaceDecls.elementAt(i));
}
else {
tmp.setAttributeNS(XMLNS_URI, XMLNS_STRING + prefix,
(String) _namespaceDecls.elementAt(i));
}
}
_namespaceDecls.clear();
}
// Add attributes to element
final int nattrs = attrs.getLength();
for (int i = 0; i < nattrs; i++) {
if (attrs.getLocalName(i) == null) {
tmp.setAttribute(attrs.getQName(i), attrs.getValue(i));
}
else {
tmp.setAttributeNS(attrs.getURI(i), attrs.getQName(i),
attrs.getValue(i));
}
}
// Append this new node onto current stack node
Node last = (Node)_nodeStk.peek();
// If the SAX2DOM is created with a non-null next sibling node,
// insert the result nodes before the next sibling under the root.
if (last == _root && _nextSibling != null)
last.insertBefore(tmp, _nextSibling);
else
last.appendChild(tmp);
// Push this node onto stack
_nodeStk.push(tmp);
_lastSibling = null;
}
public void endElement(String namespace, String localName, String qName) {
_nodeStk.pop();
_lastSibling = null;
}
public void startPrefixMapping(String prefix, String uri) {
if (_namespaceDecls == null) {
_namespaceDecls = new Vector(2);
}
_namespaceDecls.addElement(prefix);
_namespaceDecls.addElement(uri);
}
public void endPrefixMapping(String prefix) {
// do nothing
}
/**
* This class is only used internally so this method should never
* be called.
*/
public void ignorableWhitespace(char[] ch, int start, int length) {
}
/**
* adds processing instruction node to DOM.
*/
public void processingInstruction(String target, String data) {
final Node last = (Node)_nodeStk.peek();
ProcessingInstruction pi = _document.createProcessingInstruction(
target, data);
if (pi != null){
if (last == _root && _nextSibling != null)
last.insertBefore(pi, _nextSibling);
else
last.appendChild(pi);
_lastSibling = pi;
}
}
/**
* This class is only used internally so this method should never
* be called.
*/
public void setDocumentLocator(Locator locator) {
}
/**
* This class is only used internally so this method should never
* be called.
*/
public void skippedEntity(String name) {
}
/**
* Lexical Handler method to create comment node in DOM tree.
*/
public void comment(char[] ch, int start, int length) {
final Node last = (Node)_nodeStk.peek();
Comment comment = _document.createComment(new String(ch,start,length));
if (comment != null){
if (last == _root && _nextSibling != null)
last.insertBefore(comment, _nextSibling);
else
last.appendChild(comment);
_lastSibling = comment;
}
}
// Lexical Handler methods- not implemented
public void startCDATA() { }
public void endCDATA() { }
public void startEntity(String name) { }
public void endDTD() { }
public void endEntity(String name) { }
public void startDTD(String name, String publicId, String systemId)
throws SAXException { }
}