1 package org.drools.tags.semantics;
2
3 /*
4 $Id: SemanticModuleTag.java,v 1.4 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.jelly.JellyTagException;
50 import org.apache.commons.jelly.MissingAttributeException;
51 import org.apache.commons.jelly.XMLOutput;
52 import org.drools.smf.SimpleSemanticModule;
53
54 /*** Defines a <code>SemanticModule</code>.
55 *
56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
57 */
58 public class SemanticModuleTag extends SemanticsTagSupport
59 {
60 // ------------------------------------------------------------
61 // Instance members
62 // ------------------------------------------------------------
63
64 /*** The module. */
65 private SimpleSemanticModule module;
66
67 /*** The uri. */
68 private String uri;
69
70 /*** Variable to deposit resulting module into. */
71 private String var;
72
73 // ------------------------------------------------------------
74 // Constructors
75 // ------------------------------------------------------------
76
77 /*** Construct.
78 */
79 public SemanticModuleTag()
80 {
81 // intentionally left blank.
82 }
83
84 // ------------------------------------------------------------
85 // Instance methods
86 // ------------------------------------------------------------
87
88 /*** Retrieve the <code>SemanticModule</code>.
89 *
90 * @return The semantic module.
91 */
92 public SimpleSemanticModule getSemanticModule()
93 {
94 return this.module;
95 }
96
97 /*** Set the URI.
98 *
99 * @param uri The URI.
100 */
101 public void setUri(String uri)
102 {
103 this.uri = uri;
104 }
105
106 /*** Retrieve the URI.
107 *
108 * @return The URI.
109 */
110 public String getUri()
111 {
112 return this.uri;
113 }
114
115 /*** Set the variable in which to store the resulting
116 * <code>SemanticModule</code>.
117 *
118 * <p>
119 * In addition to any variable specified using
120 * this method, the variable <code>org.drools.semantic-module</code>
121 * will also hold the new <code>SemanticModule</code>.
122 * </p>
123 *
124 * @param var The variable in which to store the new semantic module.
125 */
126 public void setVar(String var)
127 {
128 this.var = var;
129 }
130
131 /*** Retrieve the variable in which to store the
132 * resulting <code>SemanticModule</code>.
133 *
134 * @return The variable name.
135 */
136 public String getVar()
137 {
138 return this.var;
139 }
140
141 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
142 // org.apache.commons.jelly.Tag
143 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
144
145 /*** Perform this tag.
146 *
147 * @param output The output sink.
148 *
149 * @throws JellyTagException If an error occurs while attempting
150 * to perform this tag.
151 */
152 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
153 {
154 if ( getUri() == null )
155 {
156 throw new MissingAttributeException( "uri" );
157 }
158
159 this.module = new SimpleSemanticModule( getUri() );
160
161 if ( getVar() != null )
162 {
163 getContext().setVariable( getVar(),
164 this.module );
165 }
166
167 getContext().setVariable( "org.drools.semantic-module",
168 this.module );
169
170 invokeBody( output );
171
172 this.module = null;
173 this.uri = null;
174 }
175 }
176
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