package username.functions;

/**
 * Functions that represent that product of two functions. 
 * E.g., f(x) = g(x) * h(x).
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2006
 */
public class ProductUIF
  implements UnaryIntegerFunction
{

// +--------+-----------------------------------------------
// | Fields |
// +--------+

  /** The first function in the product. */
  UnaryIntegerFunction fun1;
  /** The econd function in the product. */
  UnaryIntegerFunction fun2;

// +--------------+-----------------------------------------
// | Constructors |
// +--------------+

  /** Build a new function that returns f1(x)*f2(x). */
  public ProductUIF(UnaryIntegerFunction f1, UnaryIntegerFunction f2)
  {
    this.fun1 = f1;
    this.fun2 = f2;
  } // ProductUIF(UnaryIntegerFunction,UnaryIntegerFunction)

// +------------------+-------------------------------------
// | Standard Methods |
// +------------------+

  public String toString() 
  {
    String str1 = fun1.toString();
    String str2 = fun2.toString();
    if (str1.length() > 1) { str1 = "(" + str1 + ")"; }
    if (str2.length() > 1) { str2 = "(" + str2 + ")"; }

    return str1 + "*" + str2;
  } // toString

// +----------------+---------------------------------------
// | Public Methods |
// +----------------+

  public int apply(int x)
  {
    return this.fun1.apply(x) * this.fun2.apply(x);
  } // apply(int)

} // ProductUIF