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	/*
	* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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.
	*/


	package com.sun.org.apache.xalan.internal.xsltc.trax;

	import com.sun.org.apache.xalan.internal.xsltc.runtime.Constants;
	import com.sun.org.apache.xerces.internal.util.XMLSymbols;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Stack;

	import javax.xml.parsers.DocumentBuilderFactory;
	import javax.xml.parsers.ParserConfigurationException;

	import com.sun.org.apache.xalan.internal.xsltc.runtime.Constants;
	import jdk.xml.internal.JdkXmlUtils;

	import org.w3c.dom.Comment;
	import org.w3c.dom.Document;
	import org.w3c.dom.Element;
	import org.w3c.dom.Node;
	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;
	import org.xml.sax.ext.Locator2;

	/**
	* @author G. Todd Miller
	* @author Sunitha Reddy
	* @author Huizhe Wang
	* @LastModified: Nov 2017
	*/
	public class SAX2DOM implements ContentHandler, LexicalHandler, Constants {

	private Node _root = null;
	private Document _document = null;
	private Node _nextSibling = null;
	private Stack<Node> _nodeStk = new Stack<>();
	private List<String> _namespaceDecls = null;
	private Node _lastSibling = null;
	private Locator locator = null;
	private boolean needToSetDocumentInfo = true;

	//Replace StringBuffer with StringBuilder now that we no long support jdk1.4
	private StringBuilder _textBuffer = new StringBuilder();
	private Node _nextSiblingCache = null;
	/**
	* JAXP document builder factory. Create a single instance and use
	* synchronization because the Javadoc is not explicit about
	* thread safety.
	*/
	private DocumentBuilderFactory _factory;
	private boolean _internal = true;

	public SAX2DOM(boolean overrideDefaultParser) throws ParserConfigurationException {
	_document = createDocument(overrideDefaultParser);
	_root = _document;
	}

	public SAX2DOM(Node root, Node nextSibling, boolean overrideDefaultParser)
	throws ParserConfigurationException {
	_root = root;
	if (root instanceof Document) {
	_document = (Document)root;
	}
	else if (root != null) {
	_document = root.getOwnerDocument();
	}
	else {
	_document = createDocument(overrideDefaultParser);
	_root = _document;
	}

	_nextSibling = nextSibling;
	}

	public SAX2DOM(Node root, boolean overrideDefaultParser)
	throws ParserConfigurationException {
	this(root, null, overrideDefaultParser);
	}

	public Node getDOM() {
	return _root;
	}

	public void characters(char[] ch, int start, int length) {
	// Ignore text nodes of length 0
	if (length == 0) {
	return;
	}

	final Node last = _nodeStk.peek();

	// No text nodes can be children of root (DOM006 exception)
	if (last != _document) {
	_nextSiblingCache = _nextSibling;
	_textBuffer.append(ch, start, length);
	}
	}
	private void appendTextNode() {
	if (_textBuffer.length() > 0) {
	final Node last = _nodeStk.peek();
	if (last == _root && _nextSiblingCache != null) {
	_lastSibling = last.insertBefore(_document.createTextNode(_textBuffer.toString()), _nextSiblingCache);
	}
	else {
	_lastSibling = last.appendChild(_document.createTextNode(_textBuffer.toString()));
	}
	_textBuffer.setLength(0);
	}
	}
	public void startDocument() {
	_nodeStk.push(_root);
	}

	public void endDocument() {
	_nodeStk.pop();
	}

	private void setDocumentInfo() {
	//try to set document version
	if (locator == null) return;
	try{
	_document.setXmlVersion(((Locator2)locator).getXMLVersion());
	}catch(ClassCastException e){}

	}

	public void startElement(String namespace, String localName, String qName,
	Attributes attrs)
	{
	appendTextNode();
	if (needToSetDocumentInfo) {
	setDocumentInfo();
	needToSetDocumentInfo = false;
	}

	final Element tmp = _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 = _namespaceDecls.get(i++);

	if (prefix == null \|\| prefix.equals(EMPTYSTRING)) {
	tmp.setAttributeNS(XMLNS_URI, XMLNS_PREFIX,
	_namespaceDecls.get(i));
	}
	else {
	tmp.setAttributeNS(XMLNS_URI, XMLNS_STRING + prefix,
	_namespaceDecls.get(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));
	}
	} */


	// Add attributes to element
	final int nattrs = attrs.getLength();
	for (int i = 0; i < nattrs; i++) {
	// checking if Namespace processing is being done
	String attQName = attrs.getQName(i);
	String attURI = attrs.getURI(i);
	String type = (attrs.getType(i) == null) ?
	XMLSymbols.fCDATASymbol : attrs.getType(i);
	if (attrs.getLocalName(i).equals("")) {
	tmp.setAttribute(attQName, attrs.getValue(i));
	if (type.equals("ID")) {
	tmp.setIdAttribute(attQName, true);
	}
	} else {
	tmp.setAttributeNS(attURI, attQName, attrs.getValue(i));
	if (type.equals("ID")) {
	tmp.setIdAttributeNS(attURI, attrs.getLocalName(i), true);
	}
	}
	}


	// Append this new node onto current stack node
	Node last = _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) {
	appendTextNode();
	_nodeStk.pop();
	_lastSibling = null;
	}

	public void startPrefixMapping(String prefix, String uri) {
	if (_namespaceDecls == null) {
	_namespaceDecls = new ArrayList<>(2);
	}
	_namespaceDecls.add(prefix);
	_namespaceDecls.add(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) {
	appendTextNode();
	final Node last = _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.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) {
	appendTextNode();
	final Node last = _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(java.lang.String name) { }
	public void endDTD() { }
	public void endEntity(String name) { }
	public void startDTD(String name, String publicId, String systemId)
	throws SAXException {}

	private Document createDocument(boolean overrideDefaultParser)
	throws ParserConfigurationException {
	if (_factory == null) {
	_factory = JdkXmlUtils.getDOMFactory(overrideDefaultParser);
	_internal = true;
	if (!(_factory instanceof com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl)) {
	_internal = false;
	}
	}
	Document doc;
	if (_internal) {
	//default implementation is thread safe
	doc = _factory.newDocumentBuilder().newDocument();
	} else {
	synchronized(SAX2DOM.class) {
	doc = _factory.newDocumentBuilder().newDocument();
	}
	}
	return doc;
	}

	}

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