gistfile1.scala

trait ICalculatingStrategy {
	def calculate(a: Int, b: Int): Int
}

object AdderStrategy extends ICalculatingStrategy{
	override def calculate(a: Int, b: Int) = a + b
}

object MultiplierStrategy extends ICalculatingStrategy{
	override def calculate(a: Int, b: Int) = a * b
}

object CalculatingStrategyFactory {
	@inline val StrategyAdd = 2
	@inline val StrategyMultiply = 3
	
	private val Strategies = Map(
		StrategyAdd -> AdderStrategy,
		StrategyMultiply -> MultiplierStrategy
	)
	
	def create(strategy: Int) = Strategies(strategy)
}

CalculatingStrategyFactory.create(CalculatingStrategyFactory.StrategyMultiply).calculate(3, 2)