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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 47 /*** 48 * This class is an adapter for the Boolean type. 49 * 50 * @version $Revision: 1.5 $ $Date: 2003/08/10 07:09:12 $ 51 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a> 52 * @see SObject 53 */ 54 class SBool extends SObject { 55 56 /*** 57 * Boolean true 58 */ 59 public static final SBool TRUE = new SBool(Boolean.TRUE); 60 61 /*** 62 * Boolean false 63 */ 64 public static final SBool FALSE = new SBool(Boolean.FALSE); 65 66 /*** 67 * The wrapped value 68 */ 69 private Boolean _value; 70 71 72 /*** 73 * Construct a new <code>SBool</code> 74 * 75 * @param value the boolean value 76 */ 77 public SBool(final Boolean value) { 78 _value = value; 79 } 80 81 /*** 82 * Returns the value of this, wrapped in a <code>Boolean</code> 83 * 84 * @return the value of this, wrapped in a <code>Boolean</code> 85 */ 86 public final Object getObject() { 87 return _value; 88 } 89 90 /*** 91 * Returns the value of this 92 * 93 * @return the value of this 94 */ 95 public final boolean value() { 96 return _value.booleanValue(); 97 } 98 99 /*** 100 * Evaluates <code>this AND rhs</code> 101 * 102 * @param rhs the right hand side of the expression. May be null 103 * @return <code>SBool.TRUE</code> if <code>this</code> and 104 * <code>rhs</code> are <code>true</code>, <code>SBool.FALSE</code> 105 * if one is <code>false</code>, or <code>null</code> if <code>rhs</code> 106 * is <code>null</code> 107 */ 108 public final SBool and(final SBool rhs) { 109 SBool result = null; 110 if (rhs != null) { 111 if (value() && rhs.value()) { 112 result = SBool.TRUE; 113 } else { 114 result = SBool.FALSE; 115 } 116 } else if (!value()) { 117 result = SBool.FALSE; 118 } 119 120 return result; 121 } 122 123 /*** 124 * Evaluates <code>this OR rhs</code> 125 * 126 * @param rhs the right hand side of the expression. May be null 127 * @return <code>SBool.TRUE</code> if <code>this</code> is 128 * <code>true</code>, otherwise <code>rhs</code> 129 */ 130 public final SBool or(final SBool rhs) { 131 SBool result = null; 132 if (value()) { 133 result = SBool.TRUE; 134 } else { 135 result = rhs; 136 } 137 return result; 138 } 139 140 /*** 141 * Evaluates <code>NOT this</code> 142 * 143 * @return <code>SBool.TRUE</code> if <code>this</code> is 144 * <code>false</code>, otherwise <code>SBool.FALSE</code> 145 */ 146 public final SBool not() { 147 SBool result = SBool.TRUE; 148 if (value()) { 149 result = SBool.FALSE; 150 } 151 return result; 152 } 153 154 /*** 155 * Returns the type of this 156 * 157 * @return {@link Type#BOOLEAN} 158 */ 159 public final Type type() { 160 return Type.BOOLEAN; 161 } 162 163 } //-- SBool

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