import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;

/** The actual implementation of the RemoteIntegral interface.
 *
 *  Taken from Core Web Programming from 
 *  Prentice Hall and Sun Microsystems Press,
 *  http://www.corewebprogramming.com/.
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class RemoteIntegralImpl extends UnicastRemoteObject
                                implements RemoteIntegral {
         
  /** Constructor must throw RemoteException. */
         
  public RemoteIntegralImpl() throws RemoteException {}

  /** Returns the sum of f(x) from x=start to x=stop, where the
   *  function f is defined by the evaluate method of the
   *  Evaluatable object.
   */
         
  public double sum(double start, double stop, double stepSize,
                    Evaluatable evalObj) {
    return(Integral.sum(start, stop, stepSize, evalObj));
  }
         
  /** Returns an approximation of the integral of f(x) from
   *  start to stop, using the midpoint rule. The function f is
   *  defined by the evaluate method of the Evaluatable object.
   * @see #sum
   */
  
  public double integrate(double start, double stop, int numSteps,
                          Evaluatable evalObj) {
    return(Integral.integrate(start, stop, numSteps, evalObj));
  }
}