1 package org.drools.tags.rule;
2
3 /*
4 $Id: ConditionTag.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.XMLOutput;
52 import org.drools.rule.Rule;
53 import org.drools.spi.Condition;
54
55 /*** Construct a <code>Condition</code> for a <code>Rule</code>.
56 *
57 * @see Condition
58 *
59 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
60 *
61 * @version $Id: ConditionTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $
62 */
63 public class ConditionTag extends RuleTagSupport implements ConditionReceptor
64 {
65 // ------------------------------------------------------------
66 // Instance members
67 // ------------------------------------------------------------
68
69 /*** The condition.*/
70 private Condition condition;
71
72 /*** The variable. */
73 private String var;
74
75 // ------------------------------------------------------------
76 // Constructors
77 // ------------------------------------------------------------
78
79 /*** Construct.
80 */
81 public ConditionTag()
82 {
83 this.condition = null;
84 }
85
86 // ------------------------------------------------------------
87 // Instance members
88 // ------------------------------------------------------------
89
90 /*** Set the <code>Condition</code>.
91 *
92 * @param condition The condition.
93 */
94 public void setCondition(Condition condition)
95 {
96 this.condition = condition;
97 }
98
99 /*** Retrieve the <code>Condition</code>.
100 *
101 * @return The condition.
102 */
103 public Condition getCondition()
104 {
105 return this.condition;
106 }
107
108 /*** Set the variable in which to store the <code>Condition</code>.
109 *
110 * @param var The variable name.
111 */
112 public void setVar(String var)
113 {
114 this.var = var;
115 }
116
117 /*** Retrieve the variable in which to store the <code>Condition</code>.
118 *
119 * @return The variable name.
120 */
121 public String getVar()
122 {
123 return this.var;
124 }
125
126 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
127 // org.drools.tags.rule.ConditionReceptor
128 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
129
130 /*** Receive a <code>Condition</code>.
131 *
132 * @param condition The condition.
133 */
134 public void receiveCondition(Condition condition)
135 {
136 setCondition( condition );
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 Rule rule = getRule();
153
154 if ( rule == null )
155 {
156 throw new JellyTagException( "No rule available" );
157 }
158
159 invokeBody( output );
160
161 if ( this.condition == null )
162 {
163 throw new JellyTagException( "Condition expected" );
164 }
165
166 if ( this.var != null )
167 {
168 getContext().setVariable( this.var,
169 this.condition );
170 }
171
172 rule.addCondition( this.condition );
173 }
174 }
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