AddToEndSingleWithTagStrategy.kt

import com.arellomobile.mvp.MvpView
import com.arellomobile.mvp.viewstate.ViewCommand
import com.arellomobile.mvp.viewstate.strategy.StateStrategy

class AddToEndSingleWithTagStrategy : StateStrategy {

    override fun <View : MvpView> beforeApply(currentState: MutableList<ViewCommand<View>>,
                                              incomingCommand: ViewCommand<View>) {
        val iterator = currentState.iterator()

        while (iterator.hasNext()) {
            val entry = iterator.next()
            if (entry.tag == incomingCommand.tag) {
                iterator.remove()
                break
            }
        }

        currentState.add(incomingCommand)
    }

    override fun <View : MvpView> afterApply(currentState: List<ViewCommand<View>>,
                                             incomingCommand: ViewCommand<View>) {
        // pass
    }
}