1 /*
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Intalio, Inc. For written permission,
18 * please contact info@exolab.org.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Intalio, Inc. Exolab is a registered
23 * trademark of Intalio, Inc.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 1999, 2000 (C) Intalio, Inc. All Rights Reserved.
42 *
43 * $Id$
44 */
45 package org.exolab.castor.xml.util;
46
47 import org.w3c.dom.Document;
48 import org.w3c.dom.Element;
49 import org.w3c.dom.Node;
50 import org.w3c.dom.ProcessingInstruction;
51 import org.w3c.dom.Text;
52 import org.xml.sax.AttributeList;
53 import org.xml.sax.HandlerBase;
54 import org.xml.sax.SAXException;
55
56 import java.util.Stack;
57
58 /**
59 * A class for converting a SAX events to DOM nodes.
60 *
61 * @author <a href="mailto:andrew.fawcett@coda.com">Andrew Fawcett</a>
62 */
63 public class SAX2DOMHandler extends HandlerBase {
64
65 private Node _node;
66
67 private Stack<Element> _parents = new Stack<Element>();
68
69 /**
70 * Creates new instance of {@link SAX2DOMHandler} class.
71 *
72 * @param node the DOM node to use
73 */
74 public SAX2DOMHandler(Node node) {
75 _node = node;
76 }
77
78 @Override
79 public void startElement(final String name, final AttributeList attributes) {
80 Node parent = _parents.size() > 0 ? (Node) _parents.peek() : _node;
81 final Document document = getDocument(parent);
82
83 Element element = document.createElement(name);
84 int length = attributes.getLength();
85 for (int i = 0; i < length; i++) {
86 element.setAttribute(attributes.getName(i), attributes.getValue(i));
87 }
88 parent.appendChild(element);
89 _parents.push(element);
90 }
91
92 @Override
93 public void characters(final char[] chars, final int offset, final int length) {
94 String data = new String(chars, offset, length);
95 Node parent = (_parents.size() > 0) ? (Node) _parents.peek() : _node;
96 Node last = parent.getLastChild();
97 if ((last != null) && (last.getNodeType() == Node.TEXT_NODE)) {
98 ((Text) last).appendData(data);
99 } else {
100 Text text = parent.getOwnerDocument().createTextNode(data);
101 parent.appendChild(text);
102 }
103 }
104
105 @Override
106 public void endElement(final String name) {
107 _parents.pop();
108 }
109
110 @Override
111 public void processingInstruction(String target, String data) throws SAXException {
112 // adds the given processing instruction to the document root
113 Document document = getDocument(_node);
114 ProcessingInstruction instruction = document.createProcessingInstruction(target, data);
115 document.insertBefore(instruction, document.getFirstChild());
116 }
117
118 /**
119 * Returns the owning {@link Document} for the given {@link Node}.
120 * @param node A given node.
121 * @return the owning {@link Document} for the give node.
122 */
123 private Document getDocument(Node node) {
124 Document document;
125 if (node instanceof Document) {
126 document = (Document) node;
127 } else {
128 document = node.getOwnerDocument();
129 }
130 return document;
131 }
132 }