Wednesday, May 8, 2013

Published 9:50 PM by with 0 comment

Template Method Pattern



Template Method Pattern

[Download cs c#]
Definition
Define the skeleton of an algorithm in an operation, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure.

abstract class AbstractClass
    {
        public abstract void PrimitiveOperation1();
        public abstract void PrimitiveOperation2();

        public void TemplateMethod()
        {
            PrimitiveOperation1();
            PrimitiveOperation2();
            Console.WriteLine("Call Template Method");
        }
    }

    //Concrete Class A
    class ConcreteClassA : AbstractClass
    {
        public override void PrimitiveOperation1()
        {
            Console.WriteLine("concreate A primi 1");
        }

        public override void PrimitiveOperation2()
        {
            Console.WriteLine("concreate A primi 2");
        }
    }

    //Concrete Class B
    class ConcreteClassB : AbstractClass
    {
        public override void PrimitiveOperation1()
        {
            Console.WriteLine("concreate B primi 1");
        }

        public override void PrimitiveOperation2()
        {
            Console.WriteLine("concreate B primi 2");
        }
    }

//calling…
            //Template Method
            AbstractClass a = new ConcreteClassA();
            a.TemplateMethod();

            AbstractClass b = new ConcreteClassB();
            b.TemplateMethod();

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Published 1:44 AM by with 0 comment

Composite Pattern - [Structural Patterns]


Definition
[Download cs c#]
Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.

    //Component class
    abstract class Component
    {
        protected string name;

        public Component(string name)
        {
            this.name = name;
        }

        public abstract void Add(Component c);
        public abstract void Remove(Component c);
        public abstract void Display(int Dept);
    }

    //Composite Class
    class Composite : Component
    {
        private List<Component> _com = new List<Component>();

        public Composite(string name):base(name)
        {

        }
        public override void Add(Component c)
        {
            _com.Add(c);
        }
        public override void Remove(Component c)
        {
            _com.Remove(c);
        }
        public override void Display(int Dept)
        {
            Console.WriteLine(new String('-',Dept)+name);

            foreach (Component component in _com)
            {
                component.Display(Dept + 2);
            }
        }
    }

        //Leaf Class
        class Leaf : Component
        {
            public Leaf(string name):base(name)
            {

            }
            public override void Add(Component c)
            {
                Console.WriteLine("Can not add to a leaf");
            }
            public override void Remove(Component c)
            {
                Console.WriteLine("Can not remove from a leaf");
            }
            public override void Display(int Dept)
            {
                Console.WriteLine(new String('-', Dept) + name);
            }
        }


            //---Composite Calling...
            Composite root = new Composite("root");
            root.Add(new Leaf("Leaf A"));
            root.Add(new Leaf("Leaf B"));

            Composite comp = new Composite("Composite X");
            comp.Add(new Leaf("Leaf XA"));
            comp.Add(new Leaf("Leaf XAB"));

            root.Add(comp);
            root.Add(new Leaf("Leaf C"));

            // Add and remove a leaf
            Leaf leaf = new Leaf("Leaf D");
            root.Add(leaf);
            root.Remove(leaf);

            // Recursively display tree
            root.Display(1);



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Monday, May 6, 2013

Published 2:39 AM by with 0 comment

Composite Design Pattern - [Structural Patterns]



Composite Pattern

[Download cs c#] 

Definition

Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.



    //Component class
    abstract class Component
    {
        protected string name;

        public Component(string name)
        {
            this.name = name;
        }

        public abstract void Add(Component c);
        public abstract void Remove(Component c);
        public abstract void Display(int Dept);
    }

    //Composite Class
    class Composite : Component
    {
        private List<Component> _com = new List<Component>();

        public Composite(string name):base(name)
        {

        }
        public override void Add(Component c)
        {
            _com.Add(c);
        }
        public override void Remove(Component c)
        {
            _com.Remove(c);
        }
        public override void Display(int Dept)
        {
            Console.WriteLine(new String('-',Dept)+name);

            foreach (Component component in _com)
            {
                component.Display(Dept + 2);
            }
        }
    }

        //Leaf Class
        class Leaf : Component
        {
            public Leaf(string name):base(name)
            {

            }
            public override void Add(Component c)
            {
                Console.WriteLine("Can not add to a leaf");
            }
            public override void Remove(Component c)
            {
                Console.WriteLine("Can not remove from a leaf");
            }
            public override void Display(int Dept)
            {
                Console.WriteLine(new String('-', Dept) + name);
            }
        }



            //---Composite Calling...
            Composite root = new Composite("root");
            root.Add(new Leaf("Leaf A"));
            root.Add(new Leaf("Leaf B"));

            Composite comp = new Composite("Composite X");
            comp.Add(new Leaf("Leaf XA"));
            comp.Add(new Leaf("Leaf XAB"));

            root.Add(comp);
            root.Add(new Leaf("Leaf C"));

            // Add and remove a leaf
            Leaf leaf = new Leaf("Leaf D");
            root.Add(leaf);
            root.Remove(leaf);

            // Recursively display tree
            root.Display(1);

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