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Wed Mar 24 16:00:00 GMT 2004
OrExp
package examples.interpreter.java; /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * This file is part of the design patterns project at UBC * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is ca.ubc.cs.spl.patterns. * * Contributor(s): */ /** * Implements an OR expression for booleans. This is a concrete boolean * expression * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 */ public class OrExp implements BooleanExp { /** * stores the first part of the OR expression */ protected BooleanExp op1 = null; /** * stores the second part of the OR expression */ protected BooleanExp op2 = null; /** * Creates a new OR expression with the given parts * * @param op1 the first expression * @param op1 the second expression */ public OrExp(BooleanExp op1, BooleanExp op2) { this.op1 = op1; this.op2 = op2; } /** * Evaluates this expression in the given <i>Context</i> * * @param c the context to evaluate the expression in * @returns the boolean value of the expression */ public boolean evaluate(Context c) { return (op1.evaluate(c) || op2.evaluate(c)); } /** * Replaces a variable with an expression * * @param name the name of the variable * @param exp the expression to replace the variable * @returns a copy of this expression with the variable replaced */ public BooleanExp replace(String name, BooleanExp exp) { return new OrExp(op1.replace(name, exp), op2.replace(name,exp)); } /** * Copies this expression * * @returns the copied expression */ public BooleanExp copy() { return new OrExp(op1.copy(), op2.copy()); } }
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