/**
 * Title: SerializeArgs
 * Description: Using Serializable interface and ObjectStreams
 *   to read and write args to a file.
 *
 * @author hollingd@cs.rpi.edu
 */

import java.io.*;


// save argv in a file as an array of Strings

public class SerializeArgs {

  // The name of the file we read/write
  static final String fileName = "saveargs";

  static public void main(String []args) {
	// first read whatever was last saved in the file
	read();
	// now save whatever we got in args
	write(args);

  }

  /** read will read from the file, treating it as an
   *  objectstream. The assumption is that the file contains
   *  a copy of argv from the last time the program was run...
   */
  static void read() {
	String []blah;
	try {
		ObjectInputStream ois = new ObjectInputStream(
								  new FileInputStream(fileName));

		blah = (String[]) ois.readObject();

		// print out what we got
		System.out.println("Here is what we found in " + fileName);
		for (String s : blah) {
		  System.out.println(s);
		}
	} catch (IOException ioe) {
	  System.out.println("Reading failed  - no file ?");
	} catch (ClassNotFoundException cnfe) {
	  System.out.println("Something is wrong with the file....");
	}
  }

  /** write will serialize the arrary of strings and write
   *  to the file. 
   */
  static void write(String[] args) {
	try {
	  ObjectOutputStream dos = new ObjectOutputStream(
								new FileOutputStream(fileName));
	  dos.writeObject(args);
	  dos.close();
	} catch (IOException ioe) {
	  System.out.println("Error writing to " + fileName);
	}
  }
}