1 package org.apache.commons.betwixt.digester;
2
3 /*
4 * ====================================================================
5 *
6 * The Apache Software License, Version 1.1
7 *
8 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
9 * reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in
20 * the documentation and/or other materials provided with the
21 * distribution.
22 *
23 * 3. The end-user documentation included with the redistribution, if
24 * any, must include the following acknowlegement:
25 * "This product includes software developed by the
26 * Apache Software Foundation (http://www.apache.org/)."
27 * Alternately, this acknowlegement may appear in the software itself,
28 * if and wherever such third-party acknowlegements normally appear.
29 *
30 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
31 * Foundation" must not be used to endorse or promote products derived
32 * from this software without prior written permission. For written
33 * permission, please contact apache@apache.org.
34 *
35 * 5. Products derived from this software may not be called "Apache"
36 * nor may "Apache" appear in their names without prior written
37 * permission of the Apache Group.
38 *
39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This software consists of voluntary contributions made by many
54 * individuals on behalf of the Apache Software Foundation. For more
55 * information on the Apache Software Foundation, please see
56 * <http://www.apache.org/>;.
57 */
58 import java.beans.BeanInfo;
59 import java.beans.Introspector;
60 import java.beans.PropertyDescriptor;
61
62 import org.apache.commons.betwixt.AttributeDescriptor;
63 import org.apache.commons.betwixt.ElementDescriptor;
64 import org.apache.commons.betwixt.expression.ConstantExpression;
65
66 import org.apache.commons.logging.Log;
67 import org.apache.commons.logging.LogFactory;
68
69 import org.xml.sax.Attributes;
70 import org.xml.sax.SAXException;
71
72 /***
73 * <p><code>AttributeRule</code> the digester Rule for parsing the
74 * <attribute> elements.</p>
75 *
76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
77 * @version $Id: AttributeRule.java,v 1.1 2002/06/10 17:53:35 jstrachan Exp $
78 */
79 public class AttributeRule extends RuleSupport {
80
81 /*** Logger */
82 private static final Log log = LogFactory.getLog( AttributeRule.class );
83
84 private ClassLoader classLoader;
85
86 private Class beanClass;
87
88 public AttributeRule() {
89 this.classLoader = getClass().getClassLoader();
90 }
91
92 // Rule interface
93 //-------------------------------------------------------------------------
94
95 /***
96 * Process the beginning of this element.
97 *
98 * @param attributes The attribute list of this element
99 */
100 public void begin(Attributes attributes) throws Exception {
101
102 AttributeDescriptor descriptor = new AttributeDescriptor();
103 String name = attributes.getValue( "name" );
104 descriptor.setQualifiedName( name );
105 descriptor.setLocalName( name );
106 String uri = attributes.getValue( "uri" );
107 if ( uri != null ) {
108 descriptor.setURI( uri );
109 }
110 String propertyName = attributes.getValue( "property" );
111 descriptor.setPropertyName( propertyName );
112 descriptor.setPropertyType( loadClass( attributes.getValue( "type" ) ) );
113
114 if ( propertyName != null && propertyName.length() > 0 ) {
115 configureDescriptor(descriptor);
116 }
117 else {
118 String value = attributes.getValue( "value" );
119 if ( value != null ) {
120 descriptor.setTextExpression( new ConstantExpression( value ) );
121 }
122 }
123
124 Object top = digester.peek();
125 if ( top instanceof ElementDescriptor ) {
126 ElementDescriptor parent = (ElementDescriptor) top;
127 parent.addAttributeDescriptor( descriptor );
128 }
129 else {
130 throw new SAXException( "Invalid use of <attribute>. It should " +
131 "be nested inside an <element> element" );
132 }
133
134 digester.push(descriptor);
135 }
136
137
138 /***
139 * Process the end of this element.
140 */
141 public void end() throws Exception {
142 Object top = digester.pop();
143 }
144
145
146 // Implementation methods
147 //-------------------------------------------------------------------------
148 protected Class loadClass( String name ) {
149 // XXX: should use a ClassLoader to handle complex class loading situations
150 if ( name != null ) {
151 try {
152 return classLoader.loadClass(name);
153 }
154 catch (Exception e) {
155 }
156 }
157 return null;
158 }
159
160 /*** Set the Expression and Updater from a bean property name */
161 protected void configureDescriptor(AttributeDescriptor attributeDescriptor) {
162 Class beanClass = getBeanClass();
163 if ( beanClass != null ) {
164 String name = attributeDescriptor.getPropertyName();
165 try {
166 BeanInfo beanInfo = Introspector.getBeanInfo( beanClass );
167 PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
168 if ( descriptors != null ) {
169 for ( int i = 0, size = descriptors.length; i < size; i++ ) {
170 PropertyDescriptor descriptor = descriptors[i];
171 if ( name.equals( descriptor.getName() ) ) {
172 XMLIntrospectorHelper
173 .configureProperty( attributeDescriptor, descriptor );
174 getProcessedPropertyNameSet().add( name );
175 break;
176 }
177 }
178 }
179 }
180 catch (Exception e) {
181 log.warn( "Caught introspection exception", e );
182 }
183 }
184 }
185 }
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