1 package org.drools.tags.rule;
2
3 /*
4 $Id: RuleTag.java,v 1.5 2003/07/10 14:19:51 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.rule.Rule;
53 import org.drools.rule.RuleSet;
54 import org.drools.tags.knowledge.RuleBaseTag;
55
56 /*** Construct a <code>Rule</code> for a <code>RuleSet</code>.
57 *
58 * @see Rule
59 *
60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
61 *
62 * @version $Id: RuleTag.java,v 1.5 2003/07/10 14:19:51 tdiesler Exp $
63 */
64 public class RuleTag extends RuleTagSupport
65 {
66 // ------------------------------------------------------------
67 // Instance members
68 // ------------------------------------------------------------
69
70 /*** Rule name. */
71 private String name;
72
73 /*** Salience value. */
74 private Integer salience;
75
76 /*** The rule. */
77 private Rule rule;
78
79 /*** The variable. */
80 private String var;
81
82 // ------------------------------------------------------------
83 // Constructors
84 // ------------------------------------------------------------
85
86 /*** Construct.
87 */
88 public RuleTag()
89 {
90 // intentionally left blank
91 }
92
93 // ------------------------------------------------------------
94 // Instance methods
95 // ------------------------------------------------------------
96
97 /*** Set the <code>Rule<code> name.
98 *
99 * @param name The name.
100 */
101 public void setName(String name)
102 {
103 this.name = name;
104 }
105
106 /*** Retrieve the <code>Rule</code> name.
107 *
108 * @return The name.
109 */
110 public String getName()
111 {
112 return this.name;
113 }
114
115 /*** Retrieve the <code>Rule</code> salience.
116 *
117 * @return The salience.
118 */
119 public Integer getSalience()
120 {
121 return salience;
122 }
123
124 /*** Set the <code>Rule<code> salience.
125 *
126 * @param salience The salience.
127 */
128 public void setSalience( Integer salience )
129 {
130 this.salience = salience;
131 }
132
133 /*** Set the variable in which to store the <code>Rule</code>.
134 *
135 * @param var The variable name.
136 */
137 public void setVar(String var)
138 {
139 this.var = var;
140 }
141
142 /*** Retrieve the variable in which to store the <code>Rule</code>.
143 *
144 * @return The variable name.
145 */
146 public String getVar()
147 {
148 return this.var;
149 }
150
151 /*** Retrieve the <code>Rule</code>.
152 *
153 * @return The rule.
154 */
155 public Rule getRule()
156 {
157 return this.rule;
158 }
159
160 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
161 // org.apache.commons.jelly.Tag
162 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
163
164 /*** Perform this tag.
165 *
166 * @param output The output sink.
167 *
168 * @throws JellyTagException If an error occurs while attempting
169 * to perform this tag.
170 */
171 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
172 {
173 requiredAttribute( "name",
174 this.name );
175
176 this.rule = new Rule( this.name );
177
178 if ( this.salience != null )
179 {
180 this.rule.setSalience( this.salience.intValue() );
181 }
182
183 if ( this.var != null )
184 {
185 getContext().setVariable( this.var,
186 this.rule );
187 }
188
189 getContext().setVariable( "org.drools.rule",
190 this.rule );
191
192 invokeBody( output );
193
194 RuleSet ruleSet = getRuleSet();
195
196 try
197 {
198 if ( ruleSet != null )
199 {
200 ruleSet.addRule( this.rule );
201 }
202 else
203 {
204 RuleBaseTag tag = (RuleBaseTag) findAncestorWithClass( RuleBaseTag.class );
205
206 if ( tag != null )
207 {
208 tag.addRule( this.rule );
209 }
210 }
211 }
212 catch (Exception e)
213 {
214 throw new JellyTagException( e );
215 }
216 }
217 }
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