// Fig. 10.15: CommissionEmployee.java
// CommissionEmployee class extends Employee.

public class CommissionEmployee extends Employee {
  private double grossSales;      // gross weekly sales
  private double commissionRate;  // commission percentage

  // constructor
  public CommissionEmployee( String first, String last,
                             String socialSecurityNumber,
                             double grossWeeklySales, double percent )
  {
    super( first, last, socialSecurityNumber );
    setGrossSales( grossWeeklySales );
    setCommissionRate( percent );
  }

  // set commission employee's rate
  public void setCommissionRate( double rate )
  {
    commissionRate = ( rate > 0.0 && rate < 1.0 ) ? rate : 0.0;
  }

  // return commission employee's rate
  public double getCommissionRate()
  {
    return commissionRate;
  }

  // set commission employee's weekly base salary
  public void setGrossSales( double sales )
  {
    grossSales = sales < 0.0 ? 0.0 : sales;
  }

  // return commission employee's gross sales amount
  public double getGrossSales()
  {
    return grossSales;
  }

  // calculate commission employee's pay;
  // override abstract method earnings in Employee
  public double earnings()
  {
    return getCommissionRate() * getGrossSales();
  }

  // return String representation of CommissionEmployee object
  public String toString()
  {
    return "\ncommission employee: " + super.toString();
  }

} // end class CommissionEmployee