1 package org.drools.semantics.jelly;
2
3 /*
4 $Id: JellyConsequence.java,v 1.7 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.JellyContext;
50 import org.apache.commons.jelly.Script;
51 import org.apache.commons.jelly.XMLOutput;
52 import org.drools.WorkingMemory;
53 import org.drools.rule.Declaration;
54 import org.drools.spi.Consequence;
55 import org.drools.spi.ConsequenceException;
56 import org.drools.spi.Tuple;
57
58 import java.util.Iterator;
59 import java.util.Set;
60
61 /*** Jelly-script semantics <code>Consequence</code>.
62 *
63 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirteR</a>
64 *
65 * @version $Id: JellyConsequence.java,v 1.7 2003/03/25 19:47:32 tdiesler Exp $
66 */
67 public class JellyConsequence implements Consequence
68 {
69 // ------------------------------------------------------------
70 // Instance members
71 // ------------------------------------------------------------
72
73 /*** The script. */
74 private Script script;
75
76 /*** The output sink. */
77 private XMLOutput output;
78
79 // ------------------------------------------------------------
80 // Constructors
81 // ------------------------------------------------------------
82
83 /*** Construct.
84 *
85 * @param script The script to execute when matched.
86 * @param output The output sink for the script.
87 */
88 public JellyConsequence(Script script,
89 XMLOutput output)
90 {
91 this.script = script;
92 this.output = output;
93 }
94
95 // ------------------------------------------------------------
96 // Instance methods
97 // ------------------------------------------------------------
98
99 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
100 // org.drools.spi.Consequence
101 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
102
103 /*** Execute the consequence for the supplied
104 * matching <code>Tuple</code>.
105 *
106 * @param tuple The matching tuple.
107 * @param workingMemory The working memory session.
108 *
109 * @throws ConsequenceException If an error occurs while
110 * attempting to invoke the consequence.
111 */
112 public void invoke(Tuple tuple,
113 WorkingMemory workingMemory) throws ConsequenceException
114 {
115 JellyContext context = new JellyContext();
116
117 Set decls = tuple.getDeclarations();
118
119 Iterator declIter = decls.iterator();
120 Declaration eachDecl = null;
121 Object eachObj = null;
122
123 while ( declIter.hasNext() )
124 {
125 eachDecl = (Declaration) declIter.next();
126
127 context.setVariable( eachDecl.getIdentifier(),
128 tuple.get( eachDecl ) );
129
130 }
131
132 WorkingMemory origMemory = null;
133
134 try
135 {
136 origMemory = (WorkingMemory) context.getVariable( "org.drools.working-memory" );
137
138 context.setVariable( "org.drools.working-memory",
139 workingMemory );
140
141 context.setVariable( "appData",
142 workingMemory.getApplicationData() );
143
144 this.script.run( context,
145 this.output );
146 }
147 catch (Exception e)
148 {
149 throw new ConsequenceException( e );
150 }
151 finally
152 {
153 if ( origMemory != null )
154 {
155 context.setVariable( "org.drools.working-memory",
156 origMemory );
157 }
158 }
159 }
160 }
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