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1 package org.drools.semantics.python; 2 3 /* 4 $Id: ExprCondition.java,v 1.3 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.drools.smf.ConfigurableCondition; 50 import org.drools.spi.ConditionException; 51 import org.drools.spi.Tuple; 52 import org.python.core.PyException; 53 54 /*** Python expression semantics <code>Condition</code>. 55 * 56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 57 * 58 * @version $Id: ExprCondition.java,v 1.3 2003/03/25 19:47:32 tdiesler Exp $ 59 */ 60 public class ExprCondition extends Eval implements ConfigurableCondition 61 { 62 // ------------------------------------------------------------ 63 // Constructors 64 // ------------------------------------------------------------ 65 66 /*** Construct. 67 * 68 * @param expr The expression. 69 */ 70 public ExprCondition(String expr) 71 { 72 setExpression( expr ); 73 } 74 75 /*** Construct, partially. 76 */ 77 public ExprCondition() 78 { 79 // intentionally left blank. 80 } 81 82 // ------------------------------------------------------------ 83 // Instance methods 84 // ------------------------------------------------------------ 85 86 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87 // org.drools.spi.Condition 88 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 89 90 /*** Determine if the supplied <code>Tuple</code> is allowed 91 * by this condition. 92 * 93 * @param tuple The <code>Tuple</code> to test. 94 * 95 * @return <code>true</code> if the <code>Tuple</code> 96 * passes this condition, else <code>false</code>. 97 * 98 * @throws ConditionException if an error occurs during filtering. 99 */ 100 public boolean isAllowed(Tuple tuple) throws ConditionException 101 { 102 try 103 { 104 Object answer = evaluate( tuple ); 105 106 if ( ! ( answer instanceof Number ) ) 107 { 108 throw new NonBooleanExprException( getExpression() ); 109 } 110 111 return ( ( ((Number)answer).intValue() == 0 ) 112 ? false 113 : true 114 ); 115 } 116 catch (PyException e) 117 { 118 throw new ConditionException( e ); 119 } 120 } 121 122 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 123 // java.lang.String 124 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 125 126 /*** Produce a debug string. 127 * 128 * @return The debug string. 129 */ 130 public String toString() 131 { 132 return "[ExprCondition: expr=" + getExpression() + "]"; 133 } 134 }

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