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1 package org.drools.rule; 2 3 /* 4 $Id: Extraction.java,v 1.1 2002/08/18 19:17:50 bob 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.drools.spi.Extractor; 50 51 /*** A <code>Condition</code> representing a <i>consistent assignment</i> 52 * as defined by the Rete-OO algorithm. 53 * 54 * The assignment occurs through the process of extracting a 55 * new fact from existing facts. 56 * 57 * @see Extractor 58 * 59 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 60 */ 61 public class Extraction 62 { 63 // ------------------------------------------------------------ 64 // Instance members 65 // ------------------------------------------------------------ 66 67 /*** The target of the assignment. */ 68 private Declaration targetDeclaration; 69 70 /*** Extractor to acquire value for assignment. */ 71 private Extractor extractor; 72 73 // ------------------------------------------------------------ 74 // Constructors 75 // ------------------------------------------------------------ 76 77 /*** Construct. 78 * 79 * @param targetDeclaration The target of this assignment. 80 * @param extractor Value generator for the assignment. 81 */ 82 public Extraction(Declaration targetDeclaration, 83 Extractor extractor) 84 { 85 this.targetDeclaration = targetDeclaration; 86 this.extractor = extractor; 87 } 88 89 // ------------------------------------------------------------ 90 // Instance methods 91 // ------------------------------------------------------------ 92 93 /*** Retrieve the <code>Declaration</code> for the target 94 * of the assignment. 95 * 96 * @return The target's <code>Declaration</code> 97 */ 98 public Declaration getTargetDeclaration() 99 { 100 return this.targetDeclaration; 101 } 102 103 /*** Retrieve the <code>Extractor</code> responsible 104 * for generating the assignment value. 105 * 106 * @return The <code>Extractor</code>. 107 */ 108 public Extractor getExtractor() 109 { 110 return this.extractor; 111 } 112 113 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 114 // org.drools.spi.Condition 115 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 116 117 /*** Retrieve the array of <code>Declaration</code>s required 118 * by this condition to perform its duties. 119 * 120 * @return The array of <code>Declarations</code> expected 121 * on incoming <code>Tuple</code>s. 122 */ 123 public Declaration[] getRequiredTupleMembers() 124 { 125 return getExtractor().getRequiredTupleMembers(); 126 } 127 }

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