/*
* $Id: QECalculatorImpl.java 9840 2012-10-01 20:33:28Z another $
*
* This file is part of the MoSKito software project
* that is hosted at http://moskito.dev.java.net.
*
* All MoSKito files are distributed under MIT License:
*
* Copyright (c) 2006 The MoSKito Project Team.
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and
* associated documentation files (the "Software"),
* to deal in the Software without restriction,
* including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice
* shall be included in all copies
* or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY
* OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.anotheria.moskitodemo.usecases.qe.business;
public class QECalculatorImpl implements IQECalculator{
public int calculateDeterminant(int a, int b, int c) throws QECalculatorException {
int d = b*b-4*a*c;
if (d<0)
throw new NegativeDeterminantException(d);
return d;
}
public DoubleEquationResult solveForPositiveDeterminat(int a, int b, int c) throws QECalculatorException {
int D = calculateDeterminant(a,b,c);
if (D==0)
throw new QECalculatorException("Determinant is zero");
double x1 = ((-1*b)+Math.sqrt(D))/(2*a);
double x2 = ((-1*b)-Math.sqrt(D))/(2*a);
return new DoubleEquationResult(x1, x2);
}
public int solveForZeroDeterminant(int a, int b, int c) throws QECalculatorException {
//just to check that D is really zero
int D = calculateDeterminant(a,b,c);
if (D!=0)
throw new QECalculatorException("Determinant isn't zero.");
return (-1*b)/(2*a);
}
}