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| Visitor Design pattern - Implementation [Products] |
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| 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
Thank you my friend, you helped a alot!
ReplyDeleteThanks...
Deletethank you bro
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