package dk.itu.oop.testexamf2004;
import java.io.*;

class Test4{
	public static void main(String[] args){
		PersonFileWriter pf = new PersonFileWriter("Persons.txt");
		Person p1 = new Person("Knud",34);
		Person p2 = new Person("Lise",32);
		pf.print(p1);
		pf.print(p2);
		pf.close();

		try{
			PersonFileReader pfr = new PersonFileReader("Persons.txt");
			Person pp1 = pfr.getNext();
			System.out.println("Read: " + pp1);
			Person pp2 = pfr.getNext();
			System.out.println("Read: " + pp2);
			pfr.close();
		}catch(PersonFileReaderException uups){
			System.out.println(uups);
		}
		printAllPersons("Persons.txt");
	}

	static void printAllPersons(String fileName){
		System.out.println("All persons in file: " + fileName);
		try{
			PersonFileReader pfr = new PersonFileReader("Persons.txt");
			while (pfr.hasMore())
				System.out.println( pfr.getNext().toString() );
		System.out.println("-----");
		}catch(PersonFileReaderException uups){
			System.out.println(uups);
		}
	}
}

class Person {
	private String name;
	private int age;

	Person(String name, int age){
		this.name = name;
		this.age = age;
	}

	public String toString(){
		return "Person " + name + " age " + age;
		//return "Person: " + name + " age: " + age;
	}
}


class PersonFileWriter {
	PrintWriter pw;
	PersonFileWriter(String fileName){
		try{
			pw = new PrintWriter(new FileWriter(fileName) );
		}catch(IOException uups){
			System.out.println(uups);
		}
	}

	void print(Person p){
		pw.println( p.toString() );
	}

	void close(){
		pw.close();
	}
}


class PersonFileReader {
	FileReader fr;
	StreamTokenizer t;
	PersonFileReader(String fileName){
		try{
			fr = new FileReader(fileName);
			t = new StreamTokenizer(fr);
			t.nextToken();
		}catch(IOException uups){
			System.out.println(uups);
		}
	}

	boolean hasMore(){
		return t.ttype != StreamTokenizer.TT_EOF;
	}

	void close(){
		try{
			fr.close();
		}catch(IOException uups){
			System.out.println(uups);
		}
	}

	Person getNext() throws PersonFileReaderException{
		try{
			if (! t.sval.equals("Person") )
				throw new PersonFileReaderException("Expected Person, found " + t.sval);
			t.nextToken();
			String name = t.sval;

			t.nextToken();
			if (! t.sval.equals("age") )
				throw new PersonFileReaderException("Expected age, found " + t.sval);

			t.nextToken();
			int age = (int)t.nval;
			t.nextToken();
			return new Person(name, age);
		}catch(IOException uups){
			throw new PersonFileReaderException(uups.toString());
		}
	}
}

class PersonFileReaderException extends IOException{
	public PersonFileReaderException(String msg){
		super(msg);
	}
}