package chapter9;

/**
 * Title:        Chapter 9, "Object-Oriented Software Development"
 * Description:  Examples for Chapter 9
 * Copyright:    Copyright (c) 2000
 * Company:      Armstrong Atlantic State University
 * @author Y. Daniel Liang
 * @version 1.0
 */

/**RationalMatrix.java:
   Declare RationalMatrix derived from GenericMatrix*/
public class RationalMatrix extends GenericMatrix
{
  /**Construct a RationalMatrix for a given Rational array*/
  public RationalMatrix(Rational[][] m1)
  {
    super(m1);
  }

  /**Implement the createGenericMatrix method*/
  public GenericMatrix createGenericMatrix()
  {
    Rational[][] matrix =
      new Rational[getMatrix().length][getMatrix().length];
    return new RationalMatrix(matrix);
  }

  /**Implement the add method for adding two rational elements*/
  protected Object add(Object o1, Object o2)
  {
    Rational r1 = (Rational)o1;
    Rational r2 = (Rational)o2;
    return r1.add(r2);
  }

  /**Implement the multiply method for multiplying
     two rational elements*/
  protected Object multiply(Object o1, Object o2)
  {
    Rational r1 = (Rational)o1;
    Rational r2 = (Rational)o2;
    return r1.multiply(r2);
  }

  /**Implement the zero method to specify zero for Rational*/
  protected Object zero()
  {
    return new Rational(0,1);
  }
}