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1 /*** 2 * Redistribution and use of this software and associated documentation 3 * ("Software"), with or without modification, are permitted provided 4 * that the following conditions are met: 5 * 6 * 1. Redistributions of source code must retain copyright 7 * statements and notices. Redistributions must also contain a 8 * copy of this document. 9 * 10 * 2. Redistributions in binary form must reproduce the 11 * above copyright notice, this list of conditions and the 12 * following disclaimer in the documentation and/or other 13 * materials provided with the distribution. 14 * 15 * 3. The name "Exolab" must not be used to endorse or promote 16 * products derived from this Software without prior written 17 * permission of Exoffice Technologies. For written permission, 18 * please contact info@exolab.org. 19 * 20 * 4. Products derived from this Software may not be called "Exolab" 21 * nor may "Exolab" appear in their names without prior written 22 * permission of Exoffice Technologies. Exolab is a registered 23 * trademark of Exoffice Technologies. 24 * 25 * 5. Due credit should be given to the Exolab Project 26 * (http://www.exolab.org/). 27 * 28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 39 * OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Copyright 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved. 42 */ 43 44 package org.exolab.jms.selector; 45 46 import javax.jms.Message; 47 48 49 /*** 50 * This class implements an 'and' expression. 51 * 52 * @version $Revision: 1.4 $ $Date: 2003/08/09 15:49:50 $ 53 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a> 54 * @see Expression 55 * @see LogicalOperator 56 * @see SBool 57 */ 58 class Or extends LogicalOperator { 59 60 /*** 61 * The expression context, for error reporting purposes 62 */ 63 private static final String CONTEXT = "or operator"; 64 65 /*** 66 * Construct a new <code>And</code> operator 67 * 68 * @param lhs the left hand side of the expression 69 * @param rhs the right hand side of the expression 70 */ 71 public Or(final Expression lhs, final Expression rhs) { 72 super("or", lhs, rhs); 73 } 74 75 /*** 76 * Evaluate the expression 77 * 78 * @param msg the message to use to obtain any header identifier and 79 * property values 80 * @return the evaluated result, or <code>null</code> if the value of the 81 * expression is unknown 82 * @throws TypeMismatchException if the expression tries to evaluate 83 * mismatched types. 84 */ 85 public SObject evaluate(final Message msg) throws TypeMismatchException { 86 SBool result = null; 87 SBool lhs = TypeCaster.castToBool(left().evaluate(msg), CONTEXT); 88 if (lhs != null) { 89 if (lhs.value()) { 90 result = SBool.TRUE; 91 } else { 92 SBool rhs = TypeCaster.castToBool(right().evaluate(msg), 93 CONTEXT); 94 result = lhs.or(rhs); 95 } 96 } else { 97 SBool rhs = TypeCaster.castToBool(right().evaluate(msg), CONTEXT); 98 if (rhs != null) { 99 result = rhs.or(lhs); 100 } 101 } 102 return result; 103 } 104 105 } //-- Or

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