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1 package org.drools.semantics.java; 2 3 /* 4 $Id: ExprCondition.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 org.drools.rule.Declaration; 50 import org.drools.smf.ConfigurableCondition; 51 import org.drools.smf.ConfigurationException; 52 import org.drools.spi.ConditionException; 53 import org.drools.spi.Tuple; 54 55 /*** Java expression semantics <code>Condition</code>. 56 * 57 * @author <a href="mailto:bob@werken.com">bob@werken.com</a> 58 * 59 * @version $Id: ExprCondition.java,v 1.9 2003/03/25 19:47:29 tdiesler Exp $ 60 */ 61 public class ExprCondition extends Expr implements ConfigurableCondition 62 { 63 // ------------------------------------------------------------ 64 // Constructors 65 // ------------------------------------------------------------ 66 67 /*** Construct, partially. 68 * 69 * @see Expr#configure 70 */ 71 public ExprCondition() 72 { 73 // intentionally left blank. 74 } 75 76 /*** Construct. 77 * 78 * @param expr The expression. 79 * @param availDecls The available declarations. 80 * 81 * @throws ConfigurationException If an error occurs while 82 * attempting to perform configuration. 83 */ 84 public ExprCondition(String expr, 85 Declaration[] availDecls) throws ConfigurationException 86 { 87 super( expr, 88 availDecls ); 89 } 90 91 // ------------------------------------------------------------ 92 // Instance methods 93 // ------------------------------------------------------------ 94 95 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96 // org.drools.spi.Condition 97 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98 99 /*** Determine if the supplied <code>Tuple</code> is allowed 100 * by this condition. 101 * 102 * @param tuple The <code>Tuple</code> to test. 103 * 104 * @return <code>true</code> if the <code>Tuple</code> 105 * passes this condition, else <code>false</code>. 106 * 107 * @throws ConditionException if an error occurs during filtering. 108 */ 109 public boolean isAllowed(Tuple tuple) throws ConditionException 110 { 111 try 112 { 113 Object result = evaluate( tuple ); 114 115 if ( result instanceof Boolean ) 116 { 117 return ((Boolean)result).booleanValue(); 118 } 119 } 120 catch (Exception e) 121 { 122 throw new ConditionException( e ); 123 } 124 125 throw new NonBooleanExprException( getExpression() ); 126 } 127 128 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 129 // java.lang.Object 130 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 131 132 /*** Produce a debug string. 133 * 134 * @return The debug string. 135 */ 136 public String toString() 137 { 138 return "[ExprCondition: expr=" + getExpression() + "]"; 139 } 140 }

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