/**
 * Title: SerializePlay
 * Description: Using Serializable interface and ObjectStreams
 * @author hollingd@cs.rpi.edu
 */

import java.io.*;

// a base class that includes a couple of fields

abstract class Base {
	int x;
	String name;

	Base() {
		x=0;
		name="noname";
	}

	Base(int i, String s) {
		x=i;
		name=s;
	}
}


// a derived class that adds a new field and is serializable

class Foo extends Base implements Serializable{

	String fooString;

	Foo() {
		super();
		fooString="nofoostring";
	}

	Foo( int x, String n, String f) {
		super(x,n);
		fooString=f;
	}

	public String toString() {
		return "Foo:\n\tx: " + x + "\n\t" +
			"Name: " + name + "\n\t" +
			"FooString: " + fooString + "\n";
	}
}


// a main and a couple of methods for playing with 
// serializeable objects. 
public class SerializePlay {

	static public void main(String []args)
	     throws IOException,ClassNotFoundException{
		 // probably want to comment out one of these for testing
		 write();
		 // read();
	}

	// write() generates a list of 5 Foo objects and then writes
	// them to the file named "save" (as Objects)

	static public void write() throws IOException,ClassNotFoundException{
		Foo[] f = new Foo[5];

		for (int i=0;i<5;i++) {
			f[i] = new Foo(i,"my name is " + Integer.toString(i), "Foo # " + i);
		}

		for (int i=0;i<5;i++) {
			System.out.println(f[i]);
		}

		// create an ObjectOutputStream associated with the file "save"
		ObjectOutputStream dos = new ObjectOutputStream(
													new FileOutputStream("save"));
		// write each Foo object to the file
		for (int i=0;i<5;i++) {
			dos.writeObject(f[i]);
		}
		dos.close();
		System.out.println("Done");
	}


	// read() reads 5 Foo objects from the file "save"
	// and prints them out.

	static public void read() throws IOException,ClassNotFoundException{
		ObjectInputStream ois = new ObjectInputStream(
							  new FileInputStream("save"));

		Foo[] blah = new Foo[5];

		int i=0;
		boolean done=false;

		// Use EOFException to control when the loop ends

		while (! done) {
			try {
				blah[i] = (Foo) ois.readObject();
				System.out.println("Read one foo");
				i++;
			} catch( EOFException e) {
				done=true;
			}
		} 
		// print out the 5 we got.
		for ( i=0;i<5;i++) {
			System.out.println(blah[i]);
		}

	}
}