/* $Id: CalculatorImpl.java,v 1.8 1999/08/03 01:57:23 janssen Exp $
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 Copyright (c) 1991-1999 Xerox Corporation.  All Rights Reserved.

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 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 EXPRESSLY DISCLAIMED, WHETHER ARISING IN CONTRACT, TORT (INCLUDING
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 EndILUCopyright
*/
/* Chris Jacobi, November 23, 1998 5:33 pm PST */
/* Last edited by Mike Spreitzer October 9, 1998 1:45 pm PDT */

package Tutorial;

/*
 * While this class matches the Tutorial.isl specification
 * it is a local implementation.  Its instances need to be
 * registered explicitely or implicitely with Ilu before they 
 * are publicly accessible.
 */

public class CalculatorImpl   
            // You could remove the following "extends" line and it it would 
            // be more truly local. This line is necessary for the non-local
            // case, but doesn't harm the local case. 
            extends xerox.ilu.IluObjectBase
            implements Tutorial.Calculator {
    
    double theValue = 0.0;
    
    public CalculatorImpl(){
        theValue = 0.0;
    }
    
    public void SetValue(double v) {
        theValue = v;
    }
    
    public double GetValue() {
        return theValue;
    }
    
    public void Add(double v) {
        theValue = theValue + v;
    }
    
    public void Subtract(double v) {
        theValue = theValue - v;
    }
    
    public void Multiply(double v) {
        theValue = theValue * v;
    }
    
    public void Divide(double v) throws Tutorial.DivideByZero {
        if (v==0.0) throw new Tutorial.DivideByZero();
        theValue = theValue / v;
    }
    
} //CalculatorImpl
