1 /*
2 * Redistribution and use of this software and associated documentation ("Software"), with or
3 * without modification, are permitted provided that the following conditions are met:
4 *
5 * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
6 * must also contain a copy of this document.
7 *
8 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
9 * conditions and the following disclaimer in the documentation and/or other materials provided with
10 * the distribution.
11 *
12 * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
13 * without prior written permission of Intalio, Inc. For written permission, please contact
14 * info@exolab.org.
15 *
16 * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
17 * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
18 * Intalio, Inc.
19 *
20 * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
21 *
22 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
24 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
29 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * Copyright 1999, 2000 (C) Intalio, Inc. All Rights Reserved.
32 *
33 * $Id$
34 */
35 package org.exolab.castor.xml.util;
36
37 import org.w3c.dom.Document;
38 import org.w3c.dom.Element;
39 import org.w3c.dom.Node;
40 import org.w3c.dom.ProcessingInstruction;
41 import org.w3c.dom.Text;
42 import org.xml.sax.AttributeList;
43 import org.xml.sax.HandlerBase;
44 import org.xml.sax.SAXException;
45
46 import java.util.Stack;
47
48 /**
49 * A class for converting a SAX events to DOM nodes.
50 *
51 * @author <a href="mailto:andrew.fawcett@coda.com">Andrew Fawcett</a>
52 */
53 public class SAX2DOMHandler extends HandlerBase {
54
55 private final Node _node;
56
57 private final Stack<Element> _parents = new Stack<Element>();
58
59 /**
60 * Creates new instance of {@link SAX2DOMHandler} class.
61 *
62 * @param node the DOM node to use
63 */
64 public SAX2DOMHandler(Node node) {
65 _node = node;
66 }
67
68 @Override
69 public void startElement(final String name, final AttributeList attributes) {
70 Node parent = !_parents.isEmpty() ? _parents.peek() : _node;
71 final Document document = getDocument(parent);
72
73 Element element = document.createElement(name);
74 int length = attributes.getLength();
75 for (int i = 0; i < length; i++) {
76 element.setAttribute(attributes.getName(i), attributes.getValue(i));
77 }
78 parent.appendChild(element);
79 _parents.push(element);
80 }
81
82 @Override
83 public void characters(final char[] chars, final int offset, final int length) {
84 String data = new String(chars, offset, length);
85 Node parent = !_parents.isEmpty() ? _parents.peek() : _node;
86 Node last = parent.getLastChild();
87 if ((last != null) && (last.getNodeType() == Node.TEXT_NODE)) {
88 ((Text) last).appendData(data);
89 } else {
90 Text text = parent.getOwnerDocument().createTextNode(data);
91 parent.appendChild(text);
92 }
93 }
94
95 @Override
96 public void endElement(final String name) {
97 _parents.pop();
98 }
99
100 @Override
101 public void processingInstruction(String target, String data) throws SAXException {
102 // adds the given processing instruction to the document root
103 Document document = getDocument(_node);
104 ProcessingInstruction instruction = document.createProcessingInstruction(target, data);
105 document.insertBefore(instruction, document.getFirstChild());
106 }
107
108 /**
109 * Returns the owning {@link Document} for the given {@link Node}.
110 *
111 * @param node A given node.
112 * @return the owning {@link Document} for the give node.
113 */
114 private Document getDocument(Node node) {
115 Document document;
116 if (node instanceof Document) {
117 document = (Document) node;
118 } else {
119 document = node.getOwnerDocument();
120 }
121 return document;
122 }
123 }