// This class encapsulates the details of text file IO in Java
// 
// It has two methods:
//    openRead --- takes a filename (String) as a parameter and
//                 returns a Scanner for reading from that file
//    openWrite -- takes a filename (String) as a parameter and
//                 returns a PrintWriter for writing to that file
//
// M. Branicky, 10/09/06

import java.io.File;        // needed for opening/accessing/closing files
import java.util.Scanner;   // needed for input processing using Scanner
import java.io.PrintWriter; // needed for output processing using PrintWriter
import java.io.FileNotFoundException;  // needed for exception handling

public class TextFileIO 
{
  public static Scanner openRead (String filename) {
    Scanner input = null;
    File file = new File(filename);
    try {
      input = new Scanner(file);
    }
    catch (FileNotFoundException f)
    {
      System.out.println(filename + " not found.");
      System.exit(1);
    }
    return input;
  }

  public static PrintWriter openWrite (String filename) {
    PrintWriter output = null;
    File file = new File(filename);
    try {
      output = new PrintWriter(file);
    }
    catch (FileNotFoundException f)
    {
      System.out.println("Could not open "+filename);
      System.exit(1);
    }
    return output;
  }
}