/* Thursday am lecture - Part 1: Circularly Referential Data
  
--- CSU213 Fall 2006 Lecture Notes ---------
Copyright 2006 Viera K. Proulx, et. al.

Lecture 15: October 11, 2006
Circularly Referential Data

*/

class Author{
  String name;
  Book book;

  Author(String name){
    this.name = name;
    this.book = null;
  }

  // add the book the author wrote
  void add(Book book){
    this.book = book;
  }
}

class Book{
  String title;
  Author author;

  Book(String title, Author author){
    this.title = title;
    this.author = author;
    this.author.add(this);
  }
}

class Examples {
  Examples() {}

  Author dh = new Author("DH");

  boolean testAuthor1 = (check this.dh.name expect "DH") &&
                        (check this.dh.book expect null);

  Book geb = new Book("GEB", this.dh);

  boolean testAuthor2 = (check this.dh.name expect "DH") &&
                        (check this.dh.book.title expect "GEB")&&
                        (check this.dh.book expect this.geb);

  boolean testBook =  (check this.geb.author.name expect "DH") &&
                      (check this.geb.title expect "GEB") &&
                      (check this.geb.author expect this.dh);
                      
  Author dh2 = new Author("DH");
  Book geb2 = new Book("GEB", this.dh2);
  
  boolean test1 = check geb2 expect geb;
                      

}