1 package org.drools.tags.rule;
2
3 /*
4 $Id: ComponentTag.java,v 1.2 2003/03/25 19:47:32 tdiesler Exp $
5
6 Copyright 2002 (C) The Werken Company. All Rights Reserved.
7
8 Redistribution and use of this software and associated documentation
9 ("Software"), with or without modification, are permitted provided
10 that the following conditions are met:
11
12 1. Redistributions of source code must retain copyright
13 statements and notices. Redistributions must also contain a
14 copy of this document.
15
16 2. Redistributions in binary form must reproduce the
17 above copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
20
21 3. The name "drools" must not be used to endorse or promote
22 products derived from this Software without prior written
23 permission of The Werken Company. For written permission,
24 please contact bob@werken.com.
25
26 4. Products derived from this Software may not be called "drools"
27 nor may "drools" appear in their names without prior written
28 permission of The Werken Company. "drools" is a registered
29 trademark of The Werken Company.
30
31 5. Due credit should be given to The Werken Company.
32 (http://drools.werken.com/).
33
34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
45 OF THE POSSIBILITY OF SUCH DAMAGE.
46
47 */
48
49 import org.apache.commons.beanutils.ConvertingWrapDynaBean;
50 import org.apache.commons.jelly.DynaBeanTagSupport;
51 import org.apache.commons.jelly.JellyTagException;
52
53 /*** Base for dynamic semantic component tags.
54 *
55 * @see SemanticsTagLibrary
56 *
57 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
58 *
59 * @version $Id: ComponentTag.java,v 1.2 2003/03/25 19:47:32 tdiesler Exp $
60 */
61 abstract class ComponentTag extends DynaBeanTagSupport
62 {
63 // ------------------------------------------------------------
64 // Instance members
65 // ------------------------------------------------------------
66
67 /*** Class of the component. */
68 private Class componentClass;
69
70 /*** The component. */
71 private Object component;
72
73 // ------------------------------------------------------------
74 // Constructors
75 // ------------------------------------------------------------
76
77 /*** Construct.
78 */
79 ComponentTag()
80 {
81 // intentionally left blank
82 }
83
84 // ------------------------------------------------------------
85 // Instance methods
86 // ------------------------------------------------------------
87
88 /*** Set the component class.
89 *
90 * @param componentClass The component class.
91 */
92 void setComponentClass(Class componentClass)
93 {
94 this.componentClass = componentClass;
95 }
96
97 /*** Retrieve the component class.
98 *
99 * @return The component class.
100 */
101 Class getComponentClass()
102 {
103 return this.componentClass;
104 }
105
106 /*** Retrieve the component.
107 *
108 * @return The component.
109 */
110 protected Object getComponent()
111 {
112 return this.component;
113 }
114
115 /*** Set an attribute on this tag.
116 *
117 * @param name The attribute name.
118 * @param value The value.
119 *
120 * @throws JellyTagException If an error occurs while attempting
121 * to set the attribute value.
122 */
123 public void setAttribute(String name,
124 Object value) throws JellyTagException
125 {
126 super.setAttribute( name,
127 value );
128 }
129
130 /*** Hook before attributes are set for initialization.
131 *
132 * @throws JellyTagException If an error occurs.
133 */
134 public void beforeSetAttributes() throws JellyTagException
135 {
136 try
137 {
138 this.component = getComponentClass().newInstance();
139 setDynaBean( new ConvertingWrapDynaBean( this.component ) );
140 }
141 catch (Exception e)
142 {
143 throw new JellyTagException( "Unable to instantiate: " + getComponentClass().getName() );
144 }
145 }
146 }
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