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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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