import java.io.File;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

/**
   A program to test the Caesar cipher encryptor.
*/
public class EncryptorTest
{  
   public static void main(String[] args)
   {  
      try
      {  
         JFileChooser chooser = new JFileChooser();
         if (chooser.showOpenDialog(null) != JFileChooser.APPROVE_OPTION) System.exit(0);
         
         File inFile = chooser.getSelectedFile();
         if (chooser.showSaveDialog(null) != JFileChooser.APPROVE_OPTION) System.exit(0);
         File outFile = chooser.getSelectedFile();
         String input = JOptionPane.showInputDialog("Key");
         int key = Integer.parseInt(input);
         Encryptor crypt = new Encryptor(key);
         crypt.encryptFile(inFile, outFile);
      }
      catch (NumberFormatException exception)
      {  
         System.out.println("Key must be an integer: " + exception);
      }
      catch (IOException exception)
      {  
         System.out.println("Error processing file: " + exception);
      }
      System.exit(0);
   }
}