package ;

import java.util.LinkedList;

import javax.annotation.Nonnull;

import rx.functions.Action1;

public class ViewState<V extends ViewState.View> {
    public interface View {}

    private final LinkedList<Action1<V>> mActions = new LinkedList<>();
    private V mView;

    public void attach(V view) {
        mView = view;
        processUnfinishedActions();
    }

    public void detach() {
        mView = null;
    }

    public void apply(@Nonnull Action1<V> action) {
        if (mView == null) {
            mActions.add(action);
        } else {
            action.call(mView);
        }
    }

    private void processUnfinishedActions() {
        if (mActions.size() == 0) return;

        while (mActions.peek() != null) {
            mActions.pop().call(mView);
        }
    }
}