/* This application reads data in from a file and stores it in a class. */
public class StoreList
{
     public static void main (String [] args)
     {
          ProductList productList = new ProductList ();
          productList.readList ();
          productList.displayList ();
          productList.findProduct ();
     } // main method
} // class Store

class Product
{
     protected String type, id;
     protected double price;
     protected Product next;

     protected Product (String type) {this.type = type;}
     protected Product getNext () {return next;}
     protected void setNext (Product n) {next = n;}

     protected String getId () {return id;}

     public void readData (BufferedReader infile) throws IOException
     {
          try
          {
               id = infile.readLine ();
               price = Double.parseDouble (infile.readLine ());
          } catch (NumberFormatException e)
          {
               System.out.print ("Number Format Exception in the price for ");
               System.out.println (type + " " + id);
          }
     } // readData

     public void displayData ()
     {
          System.out.println ("Type: " + type);
          System.out.println ("ID: " + id);
          System.out.println ("Price: $" + decimals (price));
     } // displayData

     private String decimals (double num)
     {
          DecimalFormat decFor = new DecimalFormat ();
          decFor.setMaximumFractionDigits (2);
          decFor.setMinimumFractionDigits (2);
          return decFor.format (num);
     } // decimals
} // Product

class Fruit extends Product
{
     private String name;
     private String variety;

     Fruit (String type)
     {
          super (type);
     } // constructor

     public void readData (BufferedReader infile) throws IOException
     {
          super.readData (infile);
          name = infile.readLine ();
          variety = infile.readLine ();
     } // readData

     public void displayData ()
     {
          super.displayData ();
          System.out.println ("Name: " + name);
          System.out.println ("Variety: " + variety);
     } // displayData
} // Fruit

class Vegetable extends Product
{
     private String name;
     private String color;

     Vegetable (String type) {super (type);}

     public void readData (BufferedReader infile) throws IOException
     {
          super.readData (infile);
          name = infile.readLine ();
          color = infile.readLine ();
     } // readData

     public void displayData ()
     {
          super.displayData ();
          System.out.println ("Name: " + name);
          System.out.println ("Color: " + color);
     } // displayData
} // Vegetable

class ProductList
{
     Product listHead, listRear;

     ProductList ()
     {
          listHead = null;
          listRear = null;
     } // constructor

     public void readList ()
     {
          Product product;
          try
          {
               BufferedReader infile = new BufferedReader (new InputStreamReader (new FileInputStream ("products.txt")));
               String type = infile.readLine ();
               while (type != null)
               {
                    if (type.equals ("Fruit"))
                         product = new Fruit (type);
                    else product = new Vegetable (type);
                    product.readData (infile);
                    addToList (product);
                    type = infile.readLine ();
               }
               infile.close ();
         } catch (IOException e) {System.out.println ("File not found");}
     } // readList

     private void addToList (Product product)
     {
          if (listHead == null)
          {
               listHead = product;
               listRear = product;
          }
          else
          {
               listRear.setNext (product);
               listRear = product;
          }
     } // addToList

     public void displayList ()
     {
          Product tempNode = listHead;
          while (tempNode != null)
          {
               System.out.println ();
               tempNode.displayData ();
               tempNode = tempNode.getNext ();
          }
     } // displayList

     public void findProduct ()
     {
          try
          {
               BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in));
               System.out.println ();
               System.out.print ("Enter ID of product: ");
               String keyId = stdin.readLine ();
               Product product = findId (keyId);
               if (product != null) product.displayData ();
               else System.out.println ("ID not in list");
          } catch (IOException e) { System.out.println ("IO Exception");}
     } // findProduct

     private Product findId (String keyId)
     {
          Product tempNode = listHead;
          while ((tempNode != null) && !keyId.equals (tempNode.getId ()))
               tempNode = tempNode.getNext ();
          if (tempNode == null) return null;
          else return tempNode;
} // findId

} // ProductList