1 package org.drools.tags.rule;
2
3 /*
4 $Id: RuleSetTag.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.JellyTagException;
50 import org.apache.commons.jelly.MissingAttributeException;
51 import org.apache.commons.jelly.XMLOutput;
52 import org.drools.io.RuleSetLoader;
53 import org.drools.rule.RuleSet;
54 import org.drools.tags.knowledge.RuleBaseTag;
55
56 /*** Construct a <code>RuleSet</code>.
57 *
58 * @see RuleSet
59 *
60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
61 *
62 * @version $Id: RuleSetTag.java,v 1.6 2003/03/25 19:47:32 tdiesler Exp $
63 */
64 public class RuleSetTag extends RuleTagSupport
65 {
66 // ------------------------------------------------------------
67 // Instance members
68 // ------------------------------------------------------------
69
70 /*** Rule-set name. */
71 private String name;
72
73 /*** The rule-set. */
74 private RuleSet ruleSet;
75
76 /*** Var name. */
77 private String var;
78
79 // ------------------------------------------------------------
80 // Constructors
81 // ------------------------------------------------------------
82
83 /*** Construct.
84 */
85 public RuleSetTag()
86 {
87 // intentionally left blank
88 }
89
90 // ------------------------------------------------------------
91 // Instance methods
92 // ------------------------------------------------------------
93
94 /*** Set the <code>RuleSet</code> name.
95 *
96 * @param name The name.
97 */
98 public void setName(String name)
99 {
100 this.name = name;
101 }
102
103 /*** Retrieve the <code>RuleSet</code> name.
104 *
105 * @return The name.
106 */
107 public String getName()
108 {
109 return this.name;
110 }
111
112 /*** Set the variable in which to store the <code>RuleSet</code>.
113 *
114 * @param var The variable name.
115 */
116 public void setVar(String var)
117 {
118 this.var = var;
119 }
120
121 /*** Retrieve the variable in which to store the <code>RuleSet</code>.
122 *
123 * @return The variable name.
124 */
125 public String getVar()
126 {
127 return this.var;
128 }
129
130 /*** Retrieve the <code>RuleSet</code>.
131 *
132 * @return The rule-set.
133 */
134 public RuleSet getRuleSet()
135 {
136 return this.ruleSet;
137 }
138
139 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
140 // org.apache.commons.jelly.Tag
141 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
142
143 /*** Perform this tag.
144 *
145 * @param output The output sink.
146 *
147 * @throws JellyTagException If an error occurs while attempting
148 * to perform this tag.
149 */
150 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
151 {
152 requiredAttribute( "name",
153 this.name );
154
155 this.ruleSet = new RuleSet( this.name );
156
157 if ( this.var != null )
158 {
159 getContext().setVariable( this.var,
160 this.ruleSet );
161 }
162
163 getContext().setVariable( "org.drools.ruleset",
164 this.ruleSet );
165
166 invokeBody( output );
167
168 RuleSetLoader loader = (RuleSetLoader) getContext().getVariable( "org.drools.io.RuleSetLoader" );
169
170 if ( loader != null )
171 {
172 loader.addRuleSet( this.ruleSet );
173 }
174
175 RuleBaseTag tag = (RuleBaseTag) findAncestorWithClass( RuleBaseTag.class );
176
177 if ( tag != null )
178 {
179 tag.addRuleSet( this.ruleSet );
180 }
181 }
182 }
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