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Wed Mar 24 16:00:00 GMT 2004
Context
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): */ import java.util.Hashtable; /** * Implements a <i>Context</i> for the interpretation of boolean * expressions<p> * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see BooleanExp */ public class Context { /** * stores the mapping between variable names and values */ protected Hashtable assignments = new Hashtable(); /** * Returns the current value for a variable * * @param name the name of the variable * @returns the value of the variable */ public boolean lookup(String name) { Boolean value = (Boolean) assignments.get(name); if (value == null) { throw new ExpressionException("No variable \""+name+"\" declared."); } return value.booleanValue(); } /** * Assigns a boolean value to a <code>VariableExp</code> * * @param varExp the varaible expression to assign a value to * @param bool the boolean value to assign */ public void assign(VariableExp varExp, boolean bool) { assignments.put(varExp.getName(), new Boolean(bool)); } }
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