Enum and Generic : Enum « Language Basics « Java






Enum and Generic

Enum and Generic
  

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

/**
 * MediaInvoicer - Simple applicatin of Media, MediaFactory &c.
 * 
 * @author ian
 * @version $Id: MediaInvoicer.java,v 1.2 2004/03/08 03:30:59 ian Exp $
 */
public class MediaInvoicer {

  public static void main(String[] args) throws IOException {
    MediaInvoicer mi = new MediaInvoicer(System.in);
    Invoice i = mi.getInvoice();
    i.print(System.out);
  }
  BufferedReader myFile;
  public MediaInvoicer(InputStream is) {
    myFile = new BufferedReader(new InputStreamReader(is));
  }

  public Invoice getInvoice() throws IOException {
    String line;
    List < Item > items = new ArrayList < Item > ();
    while ((line = myFile.readLine()) != null) {
      if (line.startsWith("#")) {
        continue;
      }
      StringTokenizer st = new StringTokenizer(line);
      st.nextToken();
      Media m = MediaFactory.getMedia(st.nextToken());
      int stock = Integer.parseInt(st.nextToken());
      int qty = Integer.parseInt(st.nextToken());
      Item tmp = new Item(m, stock, qty);
      items.add(tmp);
    }
    return new Invoice(1, 3,
      (Item[]) items.toArray(new Item[items.size()]));
  }

  /** Inner class for line order item */
  class Item {
    Media product;
    int stockNumber;
    int quantity;
    /**
     * @param product
     * @param stockNumber
     * @param quantity
     */
    public Item(Media product, int stockNumber, int quantity) {
      super();
      this.product = product;
      this.stockNumber = stockNumber;
      this.quantity = quantity;
    }
    public String toString() {
      return "Item[" + product + " " + stockNumber + "]";
    }
  }
  /** Inner class for one invoice */
  class Invoice {
    int orderNumber;
    int custNumber;
    Item[] items;

    public Invoice(int orderNumber, int custNumber, Item[] items) {
      super();
      this.orderNumber = orderNumber;
      this.custNumber = custNumber;
      this.items = items;
    }
    public void print(PrintStream ps) {
      ps.println("*** Invoice ***");
      ps.println("Customer: " + custNumber + ")");
      ps.println("Our order number: " + orderNumber);
      for (int i = 0; i < items.length; i++) {
        Item it = items[i];
        ps.println(it);
      }
    }
  }
}


enum Media {

  book, music_cd, music_vinyl, movie_vhs, movie_dvd;

}


           
         
    
  








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