1 /* 2 * $Header: /cvsroot/jaxen/jaxen/src/java/main/org/jaxen/expr/DefaultAndExpr.java,v 1.5 2002/04/26 17:17:34 jstrachan Exp $ 3 * $Revision: 1.5 $ 4 * $Date: 2002/04/26 17:17:34 $ 5 * 6 * ==================================================================== 7 * 8 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 * 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions, and the disclaimer that follows 20 * these conditions in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * 3. The name "Jaxen" must not be used to endorse or promote products 24 * derived from this software without prior written permission. For 25 * written permission, please contact license@jaxen.org. 26 * 27 * 4. Products derived from this software may not be called "Jaxen", nor 28 * may "Jaxen" appear in their name, without prior written permission 29 * from the Jaxen Project Management (pm@jaxen.org). 30 * 31 * In addition, we request (but do not require) that you include in the 32 * end-user documentation provided with the redistribution and/or in the 33 * software itself an acknowledgement equivalent to the following: 34 * "This product includes software developed by the 35 * Jaxen Project (http://www.jaxen.org/)." 36 * Alternatively, the acknowledgment may be graphical using the logos 37 * available at http://www.jaxen.org/ 38 * 39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT 43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * ==================================================================== 53 * This software consists of voluntary contributions made by many 54 * individuals on behalf of the Jaxen Project and was originally 55 * created by bob mcwhirter <bob@werken.com> and 56 * James Strachan <jstrachan@apache.org>. For more information on the 57 * Jaxen Project, please see <http://www.jaxen.org/>. 58 * 59 * $Id: DefaultAndExpr.java,v 1.5 2002/04/26 17:17:34 jstrachan Exp $ 60 */ 61 62 package org.jaxen.expr; 63 64 import org.jaxen.Context; 65 import org.jaxen.JaxenException; 66 import org.jaxen.Navigator; 67 import org.jaxen.function.BooleanFunction; 68 69 class DefaultAndExpr extends DefaultLogicalExpr 70 { DefaultAndExpr(Expr lhs, Expr rhs)71 public DefaultAndExpr(Expr lhs, 72 Expr rhs) 73 { 74 super( lhs, 75 rhs ); 76 } 77 getOperator()78 public String getOperator() 79 { 80 return "and"; 81 } 82 toString()83 public String toString() 84 { 85 return "[(DefaultAndExpr): " + getLHS() + ", " + getRHS() + "]"; 86 } 87 evaluate(Context context)88 public Object evaluate(Context context) throws JaxenException 89 { 90 Navigator nav = context.getNavigator(); 91 Boolean lhsValue = BooleanFunction.evaluate( getLHS().evaluate( context ), nav ); 92 93 if ( lhsValue == Boolean.FALSE ) 94 { 95 return Boolean.FALSE; 96 } 97 98 Boolean rhsValue = BooleanFunction.evaluate( getRHS().evaluate( context ), nav ); 99 100 if ( rhsValue == Boolean.FALSE ) 101 { 102 return Boolean.FALSE; 103 } 104 105 return Boolean.TRUE; 106 } 107 } 108