1 package org.drools.tags.rule;
2
3 /*
4 $Id: SemanticsTag.java,v 1.6 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.*;
50 import org.drools.io.SemanticsLoader;
51 import org.drools.smf.SemanticModule;
52
53 /*** Load semantics.
54 *
55 * @see SemanticModule
56 *
57 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
58 *
59 * @version $Id: SemanticsTag.java,v 1.6 2003/03/25 19:47:32 tdiesler Exp $
60 */
61 public class SemanticsTag extends TagSupport
62 {
63 // ------------------------------------------------------------
64 // Instance members
65 // ------------------------------------------------------------
66
67 /*** The module id. */
68 private String module;
69
70 /*** The variable. */
71 private String var;
72
73 // ------------------------------------------------------------
74 // Constructors
75 // ------------------------------------------------------------
76
77 /*** Construct.
78 */
79 public SemanticsTag()
80 {
81 super( true );
82 this.module = null;
83 }
84
85 // ------------------------------------------------------------
86 // Instance methods
87 // ------------------------------------------------------------
88
89 /*** Set the module id to load.
90 *
91 * @param module The module id.
92 */
93 public void setModule(String module)
94 {
95 this.module = module;
96 }
97
98 /*** Retrieve the module id.
99 *
100 * @return The module id.
101 */
102 public String getModule()
103 {
104 return this.module;
105 }
106
107 /*** Set the variable in which to store the <code>SemanticModule</code>.
108 *
109 * @param var The variable name.
110 */
111 public void setVar(String var)
112 {
113 this.var = var;
114 }
115
116 /*** Retrieve the variable in which to store the <code>SemanticModule</code>.
117 *
118 * @return The variable name.
119 */
120 public String getVar()
121 {
122 return this.var;
123 }
124
125 /*** Retrieve the <code>SemanticModule</code>.
126 *
127 * @return The semantic module.
128 *
129 * @throws JellyTagException If an error occurs while attempting
130 * to load the semantic module.
131 */
132 protected SemanticModule getSemanticModule() throws JellyTagException
133 {
134 SemanticsLoader loader = new SemanticsLoader();
135
136 try
137 {
138 return loader.load( getModule() );
139 }
140 catch (Exception e)
141 {
142 throw new JellyTagException( e );
143 }
144 }
145
146 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
147 // org.apache.commons.jelly.Tag
148 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
149
150 /*** Perform this tag.
151 *
152 * @param output The output sink.
153 *
154 * @throws JellyTagException If an error occurs while attempting
155 * to perform this tag.
156 */
157 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
158 {
159 if ( this.module == null
160 ||
161 this.module.trim().equals( "" ) )
162 {
163 throw new MissingAttributeException( "module" );
164 }
165
166 SemanticModule semanticModule = getSemanticModule();
167
168 if ( semanticModule == null )
169 {
170 throw new JellyTagException( "Unknown semantic module: " + this.module );
171 }
172
173 if ( this.var != null )
174 {
175 getContext().setVariable( this.var,
176 semanticModule );
177 }
178
179 String tagLibName = this.module + ".SemanticsTagLibrary";
180
181 TagLibrary tagLib = null;
182
183 try
184
185 {
186 Class tagLibClass = Class.forName( tagLibName );
187
188 tagLib = (TagLibrary) tagLibClass.newInstance();
189 }
190 catch (Exception e)
191 {
192 tagLib = new SemanticsTagLibrary( semanticModule );
193 }
194
195 getContext().registerTagLibrary( semanticModule.getUri(),
196 tagLib );
197 }
198 }
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