/** Driver.java -- main module for our encryption program
 */

import java.io.*;          // where BufferedReader is defined

public class Driver
{
  public static void main(String [] args) throws IOException
  {
   //System.out.println("There are " + args.length + " arguments.");

    System.out.print("Do you wish to encrypt or decrypt? (e/d)  ");
    BufferedReader kbd = new BufferedReader(new InputStreamReader(System.in));
    char choice = kbd.readLine().charAt(0);

    // Let's use the Caesar cipher as our encryption scheme.  If we want
    // to change to another scheme, just use a different class that 
    // implements the Encryption interface.
    Caesar cipher = new Caesar();

    if (choice == 'e')
    {
      System.out.print("Enter text to encrypt:  ");
      String input = kbd.readLine();
      cipher.encrypt(input);
    }
    else if (choice == 'd')
    {
      System.out.print("Enter encrypted text:  ");
      String input = kbd.readLine();
      cipher.decrypt(input);
    }
  }
}