1 package org.drools.semantics.java;
2
3 /*
4 $Id: BlockConsequence.java,v 1.9 2003/03/25 19:47:29 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 bsh.NameSpace;
50 import org.drools.WorkingMemory;
51 import org.drools.rule.Declaration;
52 import org.drools.smf.ConfigurableConsequence;
53 import org.drools.smf.ConfigurationException;
54 import org.drools.spi.ConsequenceException;
55 import org.drools.spi.Tuple;
56
57 /*** Java block semantics <code>Consequence</code>.
58 *
59 * @author <a href="mailto:bob@werken.com">bob@werken.com</a>
60 *
61 * @version $Id: BlockConsequence.java,v 1.9 2003/03/25 19:47:29 tdiesler Exp $
62 */
63 public class BlockConsequence extends Interp implements ConfigurableConsequence
64 {
65 // ------------------------------------------------------------
66 // Constructors
67 // ------------------------------------------------------------
68
69 /*** Construct, partially.
70 *
71 * @see Interp#setText
72 */
73 public BlockConsequence()
74 {
75 // intentionally left blank
76 }
77
78 /*** Construct.
79 *
80 * @param block The statement block.
81 */
82 public BlockConsequence(String block)
83 {
84 setText( block );
85 }
86
87 // ------------------------------------------------------------
88 // Instance methods
89 // ------------------------------------------------------------
90
91 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
92 // org.drools.smf.ConfigurableConsequence
93 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
94
95 /*** Configure.
96 *
97 * @param text Configuration text.
98 * @param decls Available declarations.
99 *
100 * @throws ConfigurationException If an error occurs while
101 * attempting to perform configuration.
102 */
103 public void configure(String text,
104 Declaration[] decls) throws ConfigurationException
105 {
106 setText( text );
107 }
108
109 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
110 // org.drools.spi.Consequence
111 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
112
113 /*** Execute the consequence for the supplied
114 * matching <code>Tuple</code>.
115 *
116 * @param tuple The matching tuple.
117 * @param workingMemory The working memory session.
118 *
119 * @throws ConsequenceException If an error occurs while
120 * attempting to invoke the consequence.
121 * @throws NullPointerException If the working memory is
122 * <code>null</code>.
123 */
124 public void invoke(Tuple tuple,
125 WorkingMemory workingMemory) throws ConsequenceException
126 {
127 try
128 {
129 NameSpace ns = setUpNameSpace( tuple );
130
131 ns.setVariable( "drools$working$memory",
132 workingMemory );
133
134 ns.setVariable( "appData",
135 workingMemory.getApplicationData() );
136
137 evaluate( ns );
138 }
139 catch (Exception e)
140 {
141 throw new ConsequenceException( e );
142 }
143 }
144 }
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