Thursday, 17 October 2013

Prototype Design pattern - Implementation


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Prototype Design pattern - Implementation
Prototype Design pattern - Implementation - Class Diagram









































Dogear.java

public class Dogear
{
private int numberOfEars;

public int getNumberOfEars()
{
return numberOfEars;
}

public void setNumberOfEars( int numberOfEars )
{
this.numberOfEars = numberOfEars;
}

@Override
        public String toString()
        {
       return "Dogear [numberOfEars=" + numberOfEars + "]";
        }


}

Dogeye.java

public class Dogeye
{
private int numberOfEyes;

public int getNumberOfEyes()
{
return numberOfEyes;
}

public void setNumberOfEyes( int numberOfEyes )
{
this.numberOfEyes = numberOfEyes;
}

@Override
        public String toString()
        {
       return "Dogeye [numberOfEyes=" + numberOfEyes + "]";
        }


}


Dogleg.java

public class Dogleg
{
private int numberOflegs;

public int getNumberOflegs()
{
return numberOflegs;
}

public void setNumberOflegs( int numberOflegs )
{
this.numberOflegs = numberOflegs;
}

@Override
        public String toString()
        {
       return "Dogleg [numberOflegs=" + numberOflegs + "]";
        }


}


Dogtail.java

public class Dogtail
{
private String tailLength; // long or small

public String getTailLength()
{
return tailLength;
}

public void setTailLength( String tailLength )
{
this.tailLength = tailLength;
}

@Override
        public String toString()
        {
       return "Dogtail [tailLength=" + tailLength + "]";
        }

}


Animal.java

public interface Animal extends Cloneable
{
 public Animal clone();

}


Dog.java

public class Dog implements Animal
{

private String  name;
private int     age;
private String  color;
private Dogleg  dogleg;
private Dogtail dogtail;
private Dogear  dogear;
private Dogeye  dogeye;

public Dog( String name, int age, String color, Dogleg dogleg, Dogtail dogtail, Dogear dogear, Dogeye dogeye )
{
super();
this.name = name;
this.age = age;
this.color = color;
this.dogleg = dogleg;
this.dogtail = dogtail;
this.dogear = dogear;
this.dogeye = dogeye;
}

public Dogleg getDogleg()
{
return dogleg;
}

public void setDogleg( Dogleg dogleg )
{
this.dogleg = dogleg;
}

public Dogtail getDogtail()
{
return dogtail;
}

public void setDogtail( Dogtail dogtail )
{
this.dogtail = dogtail;
}

public Dogear getDogear()
{
return dogear;
}

public void setDogear( Dogear dogear )
{
this.dogear = dogear;
}

public Dogeye getDogeye()
{
return dogeye;
}

public void setDogeye( Dogeye dogeye )
{
this.dogeye = dogeye;
}

public String getName()
{
return name;
}

public void setName( String name )
{
this.name = name;
}

public int getAge()
{
return age;
}

public void setAge( int age )
{
this.age = age;
}

public String getColor()
{
return color;
}

public void setColor( String color )
{
this.color = color;
}

public Animal clone()
{

Dog dogObject = null;

try
{

dogObject = (Dog) super.clone();

}

catch( CloneNotSupportedException e )
{

e.printStackTrace();

}

return dogObject;
}

@Override
public String toString()
{
return "Dog [name=" + name + ", age=" + age + ", color=" + color + ", dogleg=" + dogleg + ", dogtail="
               + dogtail + ", dogear=" + dogear + ", dogeye=" + dogeye + "]";
}

}


AnimalCache.java

import java.util.Hashtable;

public class AnimalCache
{
private static Hashtable<String, Animal> AnimalMap = new Hashtable<String, Animal>();

public static Animal getAnimal( String animalType )
{
Dog dog = (Dog) AnimalMap.get(animalType);
if( dog == null )
{
Dogleg dogleg = new Dogleg();
dogleg.setNumberOflegs(4);

Dogear dogear = new Dogear();
dogear.setNumberOfEars(2);

Dogtail dogtail = new Dogtail();
dogtail.setTailLength("long");

Dogeye dogeye = new Dogeye();
dogeye.setNumberOfEyes(2);

dog = new Dog("Tommy", 3, "White", dogleg, dogtail, dogear, dogeye);
AnimalMap.put("dog", dog);
System.out.println("New Dog Object is created and return\n");
return dog;
}
System.out.println("\nCloned Dog Object is created and return\n");
return dog.clone();
}
}


PrototypePatternDemo.java

public class PrototypePatternDemo
{

public static void main(String[] args)
{

Dog dog = (Dog) AnimalCache.getAnimal("dog");
displayAnimalProperty(dog);

Dog cloneddog1 = (Dog) AnimalCache.getAnimal("dog");
cloneddog1.setName("Jonnie");
cloneddog1.setAge(4);
cloneddog1.setColor("Brown");
displayAnimalProperty(cloneddog1);

Dog cloneddog2 = (Dog) AnimalCache.getAnimal("dog");
cloneddog2.setName("Tony");
cloneddog2.setAge(5);
cloneddog2.setColor("Brown");
displayAnimalProperty(cloneddog2);

Dog cloneddog3 = (Dog) AnimalCache.getAnimal("dog");
cloneddog3.setName("Jimmy");
cloneddog3.setAge(8);
cloneddog3.setColor("Brown");
displayAnimalProperty(cloneddog3);

}

public static void displayAnimalProperty(Animal animal)
{
if (animal instanceof Dog)
{
Dog dog = (Dog) animal;
System.out.println(dog.toString());
System.out.println("-----------------------------------------------------------------------------------------------------");

}
}

}

Output

New Dog Object is created and return

Dog [name=Tommy, age=3, color=White, dogleg=Dogleg [numberOflegs=4], dogtail=Dogtail [tailLength=long], dogear=Dogear [numberOfEars=2], dogeye=Dogeye [numberOfEyes=2]]
-----------------------------------------------------------------------------------------------------

Cloned Dog Object is created and return

Dog [name=Jonnie, age=4, color=Brown, dogleg=Dogleg [numberOflegs=4], dogtail=Dogtail [tailLength=long], dogear=Dogear [numberOfEars=2], dogeye=Dogeye [numberOfEyes=2]]
-----------------------------------------------------------------------------------------------------

Cloned Dog Object is created and return

Dog [name=Tony, age=5, color=Brown, dogleg=Dogleg [numberOflegs=4], dogtail=Dogtail [tailLength=long], dogear=Dogear [numberOfEars=2], dogeye=Dogeye [numberOfEyes=2]]
-----------------------------------------------------------------------------------------------------

Cloned Dog Object is created and return

Dog [name=Jimmy, age=8, color=Brown, dogleg=Dogleg [numberOflegs=4], dogtail=Dogtail [tailLength=long], dogear=Dogear [numberOfEars=2], dogeye=Dogeye [numberOfEyes=2]]
-----------------------------------------------------------------------------------------------------


See also:


  • Prototype Design Pattern - Introduction
  • Prototype Design Pattern - Class Diagram
  • Prototype Design Pattern - KeyPoints
  • All Design Patterns Links
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