//********************************************************************
//  BookList.java       Author: Lewis and Loftus
//
//  Represents a collection of books.
//*******************************************************************

import Book;

public class BookList
{
   private BookNode list;

   //----------------------------------------------------------------
   //  Sets up an initially empty list of books.
   //----------------------------------------------------------------
   BookList()
   {
      list = null;
   }

   //----------------------------------------------------------------
   //  Creates a new Book object and adds it to the end of
   //  the linked list.
   //----------------------------------------------------------------
   public void add (Book newBook)
   {

      BookNode node = new BookNode (newBook);
      BookNode current;

      if (list == null)
         list = node;
      else
      {
         current = list;
         while (current.next != null)
            current = current.next;
         current.next = node;
      }
   }

   //----------------------------------------------------------------
   //  Returns this list of books as a string.
   //----------------------------------------------------------------
   public String toString ()
   {
      String result = "";

      BookNode current = list;

      while (current != null)
      {
         result += current.book.toString() + "\n";
         current = current.next;
      }

      return result;
   }

   //*****************************************************************
   //  An inner class that represents a node in the book list. The
   //  public variables are accessed by the BookList class.
   //*****************************************************************
   private class BookNode
   {
      public Book book;
      public BookNode next;

      //--------------------------------------------------------------
      //  Sets up the node
      //--------------------------------------------------------------
      public BookNode (Book theBook)
      {
         book = theBook;
         next = null;
      }
   }
}