// **********************************************************************************
//   UpdateInventory.java        Author: Lewis/Loftus (with modification)
//
//   Demonstrates the use of character file I/O.
// **********************************************************************************
import java.io.*;
import java.util.StringTokenizer;

public class UpdateInventory
{
   // -------------------------------------------------------------------
   //  Reads data about a store inventory from an input file, creating
   //  an array of InventoryItem objects. For each inventory item, gets
   //  the number of additional units and updates the total units
   //  available (restocks), then writes the updated inventory back to
   //  the file.
   // -------------------------------------------------------------------
   public static void main (String[] args)
   {
      final int MAX = 100;
      InventoryItem[] items = new InventoryItem[MAX];
      StringTokenizer tokenizer;
      String line, name, file = "inventory.dat";
      int units, count = 0;
      int addedUnits;
      float price;

      try
      {
         FileReader fr = new FileReader (file);
         BufferedReader inFile = new BufferedReader (fr);

         line = inFile.readLine();
         while (line != null)
         {
            tokenizer = new StringTokenizer (line);
            name = tokenizer.nextToken();
            try
            {
               units = Integer.parseInt (tokenizer.nextToken());
               price = Float.parseFloat (tokenizer.nextToken());
               items[count++] = new InventoryItem (name, units, price);
            }
            catch (NumberFormatException exception)
            {
                System.out.println ("Error in input. Line ignored.");
                System.out.println (line);
            }
            line = inFile.readLine();
         }
         inFile.close();

         System.out.println ("\nEnter the number of additional units of each item: ");

         // Set up the output file stream

         for (int scan = 0; scan < count; scan++)
         {
            System.out.println (items[scan]);
         }

         // Close the output file stream

      }
      catch (FileNotFoundException exception)
      {
         System.out.println ("The file " + file + " was not found.");
      }
      catch (IOException exception)
      {
         System.out.println (exception);
      }
   }
}