cof_inheritance.kt

abstract class BaseAction(
    private val nextAction: Action?
) : Action {

    override fun execute(response: Response) {
        nextAction?.execute(response)
    }
}

class Print : Action {

    override val name: String = "print"

    override fun execute(response: Response) {
        println("printing ${response.value}...")
    }
}

class PrintInErrorStream(
    nextAction: Action?
) : BaseAction(nextAction) {

    override val name: String = "print"

    override fun execute(response: Response) {
        if (response.isError) {
            System.err.println("printing (in error stream) ${response.value}...")
            return
        }
        super.execute(response)
    }
}