Monday, 2 December 2013

Builder Design pattern - Implementation [Beverage]


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Builder Design pattern - Implementation [Beverage]
Builder Design pattern - Implementation [Beverage] - Class Diagram













































Beverage.java

public class Beverage
{

private int    water;
private int    milk;
private int    sugar;
private int    powderQuantity;
private String beverageName;

public int getWater()
{
return water;
}

public void setWater( int water )
{
this.water = water;
}

public int getMilk()
{
return milk;
}

public void setMilk( int milk )
{
this.milk = milk;
}

public int getSugar()
{
return sugar;
}

public void setSugar( int sugar )
{
this.sugar = sugar;
}

public int getPowderQuantity()
{
return powderQuantity;
}

public void setPowderQuantity( int powderQuantity )
{
this.powderQuantity = powderQuantity;
}

public String getBeverageName()
{
return beverageName;
}

public void setBeverageName( String beverageName )
{
this.beverageName = beverageName;
}

public String toString()
{
return "Hot " + beverageName + "!!!!  [" + water + " ml of water, " + milk + "ml of milk, " + sugar
               + " gm of sugar, " + powderQuantity + " gm of " + beverageName + "]\n";
}

}

BeverageBuilder.java

/**
 * 
 * BeverageBuilder is a blue print for any Class that wants to create
 * Beverage. It will have different subClass implementations of BeverageBuilder
 * for different beverages[e.g. coffee,tea,Horlicks etc].
 */
public abstract class BeverageBuilder
{

private Beverage beverage;

public Beverage getBeverage()
{
return beverage;
}

public void setBeverage( Beverage beverage )
{
this.beverage = beverage;
}

/*
* Template method that creates Beverage Object and returns Beverage
* Object after adding components in required proportion.
*/
public final Beverage buildBeverage()
{
Beverage beverage = createBeverage();
setBeverage(beverage);
setBeverageType();
setWater();
setMilk();
setSugar();
setPowderQuantity();
return beverage;
}

abstract void setBeverageType();

abstract void setWater();

abstract void setMilk();

abstract void setSugar();

abstract void setPowderQuantity();

abstract Beverage createBeverage();

}


CoffeeBuilder.java

/* 
 * CoffeeBuilder creates coffee by mixing the components[water,milk,sugar,coffee powder]. 
 * CoffeeBuilder implements BeverageBuilder which is bluePrint for creating beverage objects.
 * */
public class CoffeeBuilder extends BeverageBuilder
{
Beverage createBeverage()
{
return new Beverage();
}

public void setWater()
{
System.out.println("Step 1 : Boiling water");
getBeverage().setWater(40);
}

public void setMilk()
{
System.out.println("Step 2 : Adding milk");
getBeverage().setMilk(50);
}

void setSugar()
{
System.out.println("Step 3 : Adding sugar");
getBeverage().setSugar(10);
}

void setPowderQuantity()
{
System.out.println("Step 4 : Adding 9 Grams of coffee powder");
getBeverage().setPowderQuantity(9);
}

void setBeverageType()
{
System.out.println("Coffee");
getBeverage().setBeverageName("Coffee");
}

}

TeaBuider.java

/* 
 * TeaBuilder creates Tea by mixing the components[water,milk,sugar,tea powder]. 
 * It implements BeverageBuilder which is bluePrint for creating beverage objects.
 * */
public class TeaBuider extends BeverageBuilder
{

Beverage createBeverage()
{
return new Beverage();
}

public void setWater()
{
System.out.println("Step 1 : Boiling water");
getBeverage().setWater(40);
}

public void setMilk()
{
System.out.println("Step 2 : Adding milk");
getBeverage().setMilk(50);
}

void setSugar()
{
System.out.println("Step 3 : Adding sugar");
getBeverage().setSugar(10);
}

void setPowderQuantity()
{
System.out.println("Step 4 : Adding 9 Grams of tea powder");
getBeverage().setPowderQuantity(9);
}


void setBeverageType()
{
System.out.println("Tea");
getBeverage().setBeverageName("Tea");
}

}


HotelWaiter.java

public class HotelWaiter
{

public static Beverage takeOrder( String beverageType )
{

BeverageBuilder beverageBuilder = null;

if( beverageType.equalsIgnoreCase("tea") )
{
beverageBuilder = new TeaBuider();
}
else if( beverageType.equalsIgnoreCase("coffee") )
{
beverageBuilder = new CoffeeBuilder();
}
else
{
System.out.println("Sorry we don't take order for  " + beverageType);
}
return beverageBuilder.buildBeverage();
}

}


BuilderClient.java

/*
 *  Customer who is in hotel and customer can place order to 
 *  HotelWaiter or Servant.
 */
public class BuilderClient
{
public static void main( String[] args )
{

Beverage tea = HotelWaiter.takeOrder("tea");
System.out.println(tea);
Beverage coffee = HotelWaiter.takeOrder("coffee");
System.out.println(coffee);
}
}


Output

Tea
Step 1 : Boiling water
Step 2 : Adding milk
Step 3 : Adding sugar
Step 4 : Adding 9 Grams of tea powder
Hot Tea!!!!  [40 ml of water, 50ml of milk, 10 gm of sugar, 9 gm of Tea]

Coffee
Step 1 : Boiling water
Step 2 : Adding milk
Step 3 : Adding sugar
Step 4 : Adding 9 Grams of coffee powder
Hot Coffee!!!!  [40 ml of water, 50ml of milk, 10 gm of sugar, 9 gm of Coffee]

See also:

  • Builder Design Pattern - Introduction
  • Builder Design pattern - Real Time Example [Meal Package]
  • Builder Design pattern - Real Time Example [Animal Toys]
  • Builder Design pattern - Real Time Example [Beverage]
  • Builder Design Pattern - Class Diagram
  • Builder Design Pattern - Sequence Diagram
  • Builder Design Pattern - Implementation [Animal Toy]
  • Builder Design Pattern - KeyPoints
  • All Design Patterns Links
  • 5 comments:

    1. This comment has been removed by a blog administrator.

      ReplyDelete
      Replies
      1. any intention on removing the previous comments?

        Delete
      2. No specific intention.Yes your below suggestion is valid.Thanks for the feedback.

        'Would n't it be nice if you mention the code, as you showed in sequence diagram, like client should create concrete builder and director, and get the final product'

        Delete
    2. Hello sir,
      when im using the class BeverageBuilder - im getting error message as - "the public type BeverageBuilder must be defined in its own file". how to resolve this?

      ReplyDelete
      Replies
      1. Looks like classname and the java file name is different.please check and correct

        e.g.if class name is Class A then java file name should be A.java

        Delete

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