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Programming - Strategy Behavioral Design Pattern

• Strategy
  • declares an interface common to all supported algorithms. Context uses this interface to call the algorithm defined by a ConcreteStrategy
• ConcreteStrategy
  • implements the algorithm using the Strategy interface
• Context
  • is configured with a ConcreteStrategy object
  • maintains a reference to a Strategy object
  • may define an interface that lets Strategy access its data.

System;

namespace DoFactory.GangOfFour.Strategy.Structural
{

// MainApp test application

class MainApp
{
static void Main()
{
Context context;

// Three contexts following different strategies
context = new Context(new ConcreteStrategyA());
context.ContextInterface();

context = new Context(new ConcreteStrategyB());
context.ContextInterface();

context = new Context(new ConcreteStrategyC());
context.ContextInterface();

// Wait for user
Console.Read();
}
}

// "Strategy"

abstract class Strategy
{
public abstract void AlgorithmInterface();
}

// "ConcreteStrategyA"

class ConcreteStrategyA : Strategy
{
public override void AlgorithmInterface()
{
Console.WriteLine(
"Called ConcreteStrategyA.AlgorithmInterface()");
}
}

// "ConcreteStrategyB"

class ConcreteStrategyB : Strategy
{
public override void AlgorithmInterface()
{
Console.WriteLine(
"Called ConcreteStrategyB.AlgorithmInterface()");
}
}

// "ConcreteStrategyC"

class ConcreteStrategyC : Strategy
{
public override void AlgorithmInterface()
{
Console.WriteLine(
"Called ConcreteStrategyC.AlgorithmInterface()");
}
}

// "Context"

class Context
{
Strategy strategy;

// Constructor
public Context(Strategy strategy)
{
this.strategy = strategy;
}

public void ContextInterface()
{
strategy.AlgorithmInterface();
}
}
}




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