/*
 * 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.
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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, Sunitha Reddy, Huizhe Wang
@LastModified: Nov 2017
/** * @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.
/** * 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.
/** * 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.
/** * 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.
/** * 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.
/** * 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.
/** * 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; } }