1 package org.drools.tags.knowledge;
2
3 /*
4 $Id: RuleBaseTag.java,v 1.5 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.TagSupport;
52 import org.apache.commons.jelly.XMLOutput;
53 import org.drools.RuleBase;
54 import org.drools.RuleIntegrationException;
55 import org.drools.rule.Rule;
56 import org.drools.rule.RuleSet;
57
58 /*** Create a <code>RuleBase</code>.
59 *
60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
61 *
62 * @version $Id: RuleBaseTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $
63 */
64 public class RuleBaseTag extends TagSupport
65 {
66 // ------------------------------------------------------------
67 // Instance members
68 // ------------------------------------------------------------
69
70 /*** The rule-base. */
71 private RuleBase ruleBase;
72
73 /*** The variable. */
74 private String var;
75
76 // ------------------------------------------------------------
77 // Constructors
78 // ------------------------------------------------------------
79
80 /*** Construct.
81 */
82 public RuleBaseTag()
83 {
84 super( true );
85 this.ruleBase = null;
86 }
87
88 // ------------------------------------------------------------
89 // Instance methods
90 // ------------------------------------------------------------
91
92 /*** Set the variable in which to store the <code>RuleBase</code>.
93 *
94 * @param var The variable name.
95 */
96 public void setVar(String var)
97 {
98 this.var = var;
99 }
100
101 /*** Retrieve the variable in which to store the <code>RuleBase</code>.
102 *
103 * @return The variable name.
104 */
105 public String getVar()
106 {
107 return this.var;
108 }
109
110 /*** Retrieve the <code>RuleBase</code>.
111 *
112 * @return The rule-base.
113 */
114 public RuleBase getRuleBase()
115 {
116 return this.ruleBase;
117 }
118
119 /*** Add a <code>RuleSet</code> to the <code>RuleBase</code>.
120 *
121 * @param ruleSet The rule-set to add.
122 *
123 * @throws JellyTagException If an error occurs while attempting
124 * to add the rule-set.
125 */
126 public void addRuleSet(RuleSet ruleSet) throws JellyTagException
127 {
128 try
129 {
130 getRuleBase().addRuleSet( ruleSet );
131 }
132 catch (RuleIntegrationException e)
133 {
134 throw new JellyTagException( e );
135 }
136 }
137
138 /*** Add a <code>Rule</code> to the <code>RuleBase</code>.
139 *
140 * @param rule The rule to add.
141 *
142 * @throws JellyTagException If an error occurs while attempting
143 * to add the rule.
144 */
145 public void addRule(Rule rule) throws JellyTagException
146 {
147 try
148 {
149 getRuleBase().addRule( rule );
150 }
151 catch (RuleIntegrationException e)
152 {
153 throw new JellyTagException( e );
154 }
155 }
156
157 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
158 // org.apache.commons.jelly.Tag
159 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
160
161 /*** Perform this tag.
162 *
163 * @param output The output sink.
164 *
165 * @throws JellyTagException If an error occurs while attempting
166 * to perform this tag.
167 */
168 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
169 {
170 if ( this.var == null )
171 {
172 throw new MissingAttributeException( "var" );
173 }
174
175 this.ruleBase = new RuleBase();
176
177 getContext().setVariable( this.var,
178 this.ruleBase );
179
180 invokeBody( output );
181 }
182 }
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