1 /*
2 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
3 *
4 * This software is open source.
5 * See the bottom of this file for the licence.
6 */
7
8 package org.dom4j.bean;
9
10 import org.dom4j.Attribute;
11 import org.dom4j.DocumentFactory;
12 import org.dom4j.Element;
13 import org.dom4j.QName;
14 import org.dom4j.tree.DefaultAttribute;
15
16 import org.xml.sax.Attributes;
17
18 /***
19 * <p>
20 * <code>BeanDocumentFactory</code> is a factory of DOM4J objects which may be
21 * BeanElements which are backed by JavaBeans and their properties.
22 * </p>
23 *
24 * <p>
25 * The tree built allows full XPath expressions from anywhere on the tree.
26 * </p>
27 *
28 * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
29 * @version $Revision: 1.14 $
30 */
31 public class BeanDocumentFactory extends DocumentFactory {
32 /*** The Singleton instance */
33 private static BeanDocumentFactory singleton = new BeanDocumentFactory();
34
35 /***
36 * <p>
37 * Access to the singleton instance of this factory.
38 * </p>
39 *
40 * @return the default singleon instance
41 */
42 public static DocumentFactory getInstance() {
43 return singleton;
44 }
45
46 // Factory methods
47 public Element createElement(QName qname) {
48 Object bean = createBean(qname);
49
50 if (bean == null) {
51 return new BeanElement(qname);
52 } else {
53 return new BeanElement(qname, bean);
54 }
55 }
56
57 public Element createElement(QName qname, Attributes attributes) {
58 Object bean = createBean(qname, attributes);
59
60 if (bean == null) {
61 return new BeanElement(qname);
62 } else {
63 return new BeanElement(qname, bean);
64 }
65 }
66
67 public Attribute createAttribute(Element owner, QName qname, String value) {
68 return new DefaultAttribute(qname, value);
69 }
70
71 // Implementation methods
72 protected Object createBean(QName qname) {
73 return null;
74 }
75
76 protected Object createBean(QName qname, Attributes attributes) {
77 String value = attributes.getValue("class");
78
79 if (value != null) {
80 try {
81 Class beanClass = Class.forName(value, true,
82 BeanDocumentFactory.class.getClassLoader());
83
84 return beanClass.newInstance();
85 } catch (Exception e) {
86 handleException(e);
87 }
88 }
89
90 return null;
91 }
92
93 protected void handleException(Exception e) {
94 // ignore introspection exceptions
95 System.out.println("#### Warning: couldn't create bean: " + e);
96 }
97 }
98
99 /*
100 * Redistribution and use of this software and associated documentation
101 * ("Software"), with or without modification, are permitted provided that the
102 * following conditions are met:
103 *
104 * 1. Redistributions of source code must retain copyright statements and
105 * notices. Redistributions must also contain a copy of this document.
106 *
107 * 2. Redistributions in binary form must reproduce the above copyright notice,
108 * this list of conditions and the following disclaimer in the documentation
109 * and/or other materials provided with the distribution.
110 *
111 * 3. The name "DOM4J" must not be used to endorse or promote products derived
112 * from this Software without prior written permission of MetaStuff, Ltd. For
113 * written permission, please contact dom4j-info@metastuff.com.
114 *
115 * 4. Products derived from this Software may not be called "DOM4J" nor may
116 * "DOM4J" appear in their names without prior written permission of MetaStuff,
117 * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
118 *
119 * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
120 *
121 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
122 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
123 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
124 * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
125 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
126 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
127 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
128 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
129 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
130 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
131 * POSSIBILITY OF SUCH DAMAGE.
132 *
133 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
134 */