Saturday, 11 January 2014

Visitor Design pattern - Implementation [Products]



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Visitor Design pattern - Implementation [Products]

Visitor Design pattern - Implementation [Products] - Class Diagram




















Product.java

/*
 * Visitable Class
 */
public abstract class Product
{
protected int price;

public abstract void accept( ShoppingMallVisitor shoppingMallVisitor );

public int getPrice()
{
return price;
}
}

Book.java

public class Book extends Product
{

private String name;
private String isbnNumber;

public Book( String name, String isbnNumber, int price )
{
super();
this.name = name;
this.isbnNumber = isbnNumber;
this.price = price;
}

public String getName()
{
return name;
}

public String getIsbnNumber()
{
return isbnNumber;
}

@Override
public void accept( ShoppingMallVisitor shoppingMallVisitor )
{
shoppingMallVisitor.visit(this);
}

@Override
public String toString()
{
return "Book [name=" + name + ", isbnNumber=" + isbnNumber + ", price=" + price + "]";
}

}

DVD.java

public class DVD extends Product
{

private String name;

public DVD( String name, int price )
{
super();
this.name = name;
this.price = price;
}

public String getName()
{
return name;
}

@Override
public void accept( ShoppingMallVisitor shoppingMallVisitor )
{
shoppingMallVisitor.visit(this);
}

@Override
public String toString()
{
return "DVD [name=" + name + ", price=" + price + "]";
}

}

Shirt.java

public class Shirt extends Product
{

private String brandName;
private String size;

public Shirt( String brandName, String size, int price )
{
super();
this.brandName = brandName;
this.size = size;
this.price = price;
}

public String getBrandName()
{
return brandName;
}

public String getSize()
{
return size;
}

@Override
public void accept( ShoppingMallVisitor shoppingMallVisitor )
{
shoppingMallVisitor.visit(this);
}

@Override
public String toString()
{
return "Shirt [brandName=" + brandName + ", size=" + size + ", price=" + price + "]";
}

}

ShoppingMallVisitor.java

public interface ShoppingMallVisitor
{
public void visit(Product product);
}

Cashier.java

public class Cashier implements ShoppingMallVisitor
{

private String name;

private int    totalPrice = 0;

public int getTotalPrice()
{
return totalPrice;
}

public Cashier( String name )
{
super();
this.name = name;
}

public String getName()
{
return name;
}

@Override
public void visit( Product product )
{
totalPrice = totalPrice + product.getPrice();
}

}

ShoppingMallProducts.java

import java.util.ArrayList;
import java.util.LinkedHashMap;

public class ShoppingMallProducts
{

static LinkedHashMap<String, Product> productMap;

static
{
productMap = new LinkedHashMap<String, Product>();

Book weArebackBook = new Book("We are Back", "ISBN-999", 200);
Book jesusStoryBook = new Book("Jesus Story", "ISBN-1999", 500);
Book moralStoryBook = new Book("Moral Story", "ISBN-2999", 600);

DVD dieHard2Dvd = new DVD("Die Hard 2", 100);
DVD terminatorDvd = new DVD("The Terminator", 150);
DVD titanicDvd = new DVD("Titanic", 120);

Shirt zeroShirt = new Shirt("Zero", "42", 1500);
Shirt peterEnglandShirt = new Shirt("Peter England", "42", 2500);
Shirt johnPlayersShirt = new Shirt("John Players", "40", 2500);

productMap.put("weArebackBook", weArebackBook);
productMap.put("jesusStoryBook", jesusStoryBook);
productMap.put("moralStoryBook", moralStoryBook);
productMap.put("dieHard2Dvd", dieHard2Dvd);
productMap.put("terminatorDvd", terminatorDvd);
productMap.put("titanicDvd", titanicDvd);
productMap.put("zeroShirt", zeroShirt);
productMap.put("peterEnglandShirt", peterEnglandShirt);
productMap.put("johnPlayersShirt", johnPlayersShirt);

}

public int getTotalAmount( ArrayList<Product> purchasedProductList )
{
Cashier cashier = new Cashier("John");

System.out.println("Puschased Products details : \n");
for( Product product : purchasedProductList )
{
// Each product accepts the visitor
product.accept(cashier);
System.out.println(product+"\n");
}

return cashier.getTotalPrice();
}

}


Client.java

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Set;


public class Client
{

public static void main( String[] args )
{
LinkedHashMap<String, Product> productMap = ShoppingMallProducts.productMap;
Set<String> products=productMap.keySet();
System.out.println("Products Available \n");
for( String string : products )
                {
System.out.println(productMap.get(string));
                }
System.out.println(" \n############################################################# \n");
ArrayList<Product>    purchasedProductList = new ArrayList<Product>();
purchasedProductList.add(productMap.get("weArebackBook"));
purchasedProductList.add(productMap.get("jesusStoryBook"));
purchasedProductList.add(productMap.get("dieHard2Dvd"));
purchasedProductList.add(productMap.get("terminatorDvd"));
purchasedProductList.add(productMap.get("zeroShirt"));
purchasedProductList.add(productMap.get("peterEnglandShirt"));
ShoppingMallProducts shoppingMallProducts = new ShoppingMallProducts();
System.out.println("Total Amount : "+shoppingMallProducts.getTotalAmount(purchasedProductList) + "Rs");
}

}


Output

Products Available 

Book [name=We are Back, isbnNumber=ISBN-999, price=200]
Book [name=Jesus Story, isbnNumber=ISBN-1999, price=500]
Book [name=Moral Story, isbnNumber=ISBN-2999, price=600]
DVD [name=Die Hard 2, price=100]
DVD [name=The Terminator, price=150]
DVD [name=Titanic, price=120]
Shirt [brandName=Zero, size=42, price=1500]
Shirt [brandName=Peter England, size=42, price=2500]
Shirt [brandName=John Players, size=40, price=2500]
############################################################# 

Puschased Products details : 

Book [name=We are Back, isbnNumber=ISBN-999, price=200]

Book [name=Jesus Story, isbnNumber=ISBN-1999, price=500]

DVD [name=Die Hard 2, price=100]

DVD [name=The Terminator, price=150]

Shirt [brandName=Zero, size=42, price=1500]

Shirt [brandName=Peter England, size=42, price=2500]

Total Amount : 4950Rs


See also:

  • Visitor Design pattern - Introduction
  • Visitor Design pattern - Real time Example [Kids]
  • Visitor Design pattern - Real time Example [Products]
  • Visitor Design pattern - Class Diagram
  • Visitor Design pattern - Implementation [Kids]
  • Visitor Design pattern - KeyPoints
  • All Design Patterns Links
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