1 package org.drools.tags.knowledge;
2
3 /*
4 $Id: KnowledgeTag.java,v 1.4 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.WorkingMemory;
55
56 /*** Work in a knowledge session.
57 *
58 * @see WorkingMemory
59 *
60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
61 *
62 * @version $Id: KnowledgeTag.java,v 1.4 2003/03/25 19:47:32 tdiesler Exp $
63 */
64 public class KnowledgeTag extends TagSupport
65 {
66 // ------------------------------------------------------------
67 // Instance members
68 // ------------------------------------------------------------
69
70 /*** The variable. */
71 private String var;
72
73 /*** Transactional flag. */
74 private boolean transactional;
75
76 /*** The working memory. */
77 private WorkingMemory workingMemory;
78
79 /*** The rule base. */
80 private RuleBase ruleBase;
81
82 // ------------------------------------------------------------
83 // Constructors
84 // ------------------------------------------------------------
85
86 /*** Construct.
87 */
88 public KnowledgeTag()
89 {
90 super( true );
91 this.transactional = false;
92 }
93
94 // ------------------------------------------------------------
95 // Instance methods
96 // ------------------------------------------------------------
97
98 /*** Set the transactionality flag.
99 *
100 * @param transactional Transactionality flag.
101 */
102 public void setTransactional(boolean transactional)
103 {
104 this.transactional = transactional;
105 }
106
107 /*** Retrieve the transactionality flag.
108 *
109 * @return The transactionality flag.
110 */
111 public boolean getTransactional()
112 {
113 return this.transactional;
114 }
115
116 /*** Set the variable in which to store the <code>WorkingMemory</code>.
117 *
118 * @param var The variable name.
119 */
120 public void setVar(String var)
121 {
122 this.var = var;
123 }
124
125 /*** Retrieve the variable in which to store the <code>WorkingMemory</code>.
126 *
127 * @return The variable name.
128 */
129 public String getVar()
130 {
131 return this.var;
132 }
133
134 /*** Set the <code>WorkingMemory</code>.
135 *
136 * @param memory The working memory.
137 */
138 public void setMemory(WorkingMemory memory)
139 {
140 this.workingMemory = memory;
141 }
142
143 /*** Retrieve the <code>WorkingMemory</code>.
144 *
145 * @return The working memory.
146 */
147 public WorkingMemory getMemory()
148 {
149 return this.workingMemory;
150 }
151
152 /*** Set the <code>RuleBase</code>.
153 *
154 * @param ruleBase The rule-base.
155 */
156 public void setRules(RuleBase ruleBase)
157 {
158 this.ruleBase = ruleBase;
159 }
160
161 /*** Retrieve the <code>RuleBase</code>.
162 *
163 * @return The rule-base.
164 */
165 public RuleBase getRules()
166 {
167 return this.ruleBase;
168 }
169
170 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
171 // org.apache.commons.jelly.Tag
172 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
173
174 /*** Perform this tag.
175 *
176 * @param output The output sink.
177 *
178 * @throws JellyTagException If an error occurs while attempting
179 * to perform this tag.
180 */
181 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
182 {
183 if ( this.workingMemory == null
184 &&
185 this.ruleBase == null )
186 {
187 throw new JellyTagException( "Either 'memory' or 'rulebase' attribute must be specified" );
188 }
189
190 if ( this.workingMemory == null )
191 {
192 if ( this.transactional )
193 {
194 this.workingMemory = this.ruleBase.createTransactionalWorkingMemory();
195 }
196 else
197 {
198 this.workingMemory = this.ruleBase.createWorkingMemory();
199 }
200 }
201
202 invokeBody( output );
203 }
204 }
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