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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 a 'between' expression. 51 * This is a boolean expression of the form: 52 * numeric-expr1 between numeric-expr2 and numeric-expr3 53 * This is equivalent to: 54 * numeric-expr1 >= numeric-expr2 and numeric-expr1 <= numeric-expr3 55 * 56 * @version $Revision: 1.5 $ $Date: 2003/08/09 15:49:50 $ 57 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a> 58 * @see Expression 59 * @see SBool 60 */ 61 class BetweenExpression implements Expression { 62 63 /*** 64 * Corresponds to numeric-expr1 65 */ 66 private final Expression _num1; 67 68 /*** 69 * Corresponds to numeric-expr2 70 */ 71 private final Expression _num2; 72 73 /*** 74 * Corresponds to numeric-expr3 75 */ 76 private final Expression _num3; 77 78 /*** 79 * The expression context, for error reporting purposes 80 */ 81 private static final String CONTEXT = "between expression"; 82 83 84 /*** 85 * Construct an expression that returns num1 >= num2 and num1 <= num3 86 * when evaluated 87 * 88 * @param num1 arithmetic expression 89 * @param num2 arithmetic expression representing the 90 * lower bound 91 * @param num3 arithmetic expression representing the 92 * upper bound 93 */ 94 public BetweenExpression(final Expression num1, final Expression num2, 95 final Expression num3) { 96 _num1 = num1; 97 _num2 = num2; 98 _num3 = num3; 99 } 100 101 /*** 102 * Evaluate the 'between' expression 103 * 104 * @param msg the message to evalulate the expression against 105 * @return an SBool instance 106 * @throws TypeMismatchException if any of the expressions are not numeric 107 */ 108 public final SObject evaluate(final Message msg) 109 throws TypeMismatchException { 110 SBool result = null; 111 SNumber val1 = TypeCaster.castToNumber(_num1.evaluate(msg), CONTEXT); 112 if (val1 != null) { 113 SNumber val2 = TypeCaster.castToNumber(_num2.evaluate(msg), 114 CONTEXT); 115 if (val2 != null) { 116 SNumber val3 = TypeCaster.castToNumber(_num3.evaluate(msg), 117 CONTEXT); 118 if (val3 != null) { 119 if (val1.greaterEqual(val2).value() 120 && val1.lessEqual(val3).value()) { 121 result = SBool.TRUE; 122 } else { 123 result = SBool.FALSE; 124 } 125 } 126 } 127 } 128 return result; 129 } 130 131 /*** 132 * Return a string representation of this expression 133 * 134 * @return a string representation of this expression 135 */ 136 public final String toString() { 137 StringBuffer result = new StringBuffer(); 138 result.append('('); 139 result.append(_num1.toString()); 140 result.append(" between "); 141 result.append(_num2.toString()); 142 result.append(" and "); 143 result.append(_num3.toString()); 144 result.append(')'); 145 return result.toString(); 146 } 147 148 } //-- BetweenExpression

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