gistfile1.txt

/**
 * Базвый нафигатор фрагметов
 *
 * @param <T>
 */
abstract class BaseFragmentNavigator<T extends Provider<?>> implements Navigator {
    protected final T provider;

    BaseFragmentNavigator(T provider) {
        this.provider = provider;
    }

    @IntDef({TRANSIT_NONE, TRANSIT_FRAGMENT_OPEN, TRANSIT_FRAGMENT_CLOSE, TRANSIT_FRAGMENT_FADE})
    @Retention(RetentionPolicy.SOURCE)
    private @interface Transit {
    }

    abstract FragmentManager getFragmentManager();

    public void add(FragmentRoute route, boolean stackable, @Transit int transition) {
        int viewContainerId = getViewContainerIdOrThrow();
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.executePendingTransactions();

        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(viewContainerId, route.createFragment(), route.getTag());
        fragmentTransaction.setTransition(transition);
        if (stackable) {
            fragmentTransaction.addToBackStack(route.getTag());
        }

        fragmentTransaction.commit();
    }

    public void replace(FragmentRoute route, boolean stackable, @Transit int transition) {
        int viewContainerId = getViewContainerIdOrThrow();
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.executePendingTransactions();

        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(viewContainerId, route.createFragment(), route.getTag());
        fragmentTransaction.setTransition(transition);
        if (stackable) {
            fragmentTransaction.addToBackStack(route.getTag());
        }

        fragmentTransaction.commit();
    }

    /**
     * @return возвращает {@code true} если фрагмент был удален успешно
     */
    public boolean remove(FragmentRoute route, @Transit int transition) {
        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.executePendingTransactions();

        Fragment fragment = fragmentManager.findFragmentByTag(route.getTag());
        if (fragment == null) {
            return false;
        }

        fragmentManager.beginTransaction()
                .setTransition(transition)
                .remove(fragment)
                .commit();
        return true;
    }

    /**
     * @return возвращает {@code true} если фрагмент успешно отобразился
     */
    public boolean show(FragmentRoute route, @Transit int transition) {
        return toggleVisibility(route, true, transition);
    }

    /**
     * @return возвращает {@code true} если фрагмент был скрыт успешно
     */
    public boolean hide(FragmentRoute route, @Transit int transition) {
        return toggleVisibility(route, false, transition);
    }
}

/**
 * базовый маршрут для открытия фрагмента
 * см {@link Route}
 */
public abstract class FragmentRoute implements Route {

    protected abstract Class<? extends Fragment> getFragmentClass();

    public String getTag(){
        return getFragmentClass().getCanonicalName();
    }

    public Fragment createFragment(){
        try {
            return getFragmentClass().newInstance();
        } catch (InstantiationException | IllegalAccessException e) {
            throw new IllegalStateException(e);
        }
    }
}

/**
 * см {@link Route}
 */
public abstract class FragmentWithParamsRoute extends FragmentRoute {

    public FragmentWithParamsRoute(){
    }

    public FragmentWithParamsRoute(Bundle bundle){

    }

    protected abstract Bundle prepareBundle();

    @Override
    public Fragment createFragment(){
        Fragment fragment = super.createFragment();
        fragment.setArguments(prepareBundle());
        return fragment;
    }
}


/**
 * Маршрут экрана списка заказов
 */
@Data
public class OrdersFragmentRoute extends FragmentRoute {

    public OrdersFragmentRoute() {
    }

    @Override
    protected Class<? extends Fragment> getFragmentClass() {
        return OrdersFragmentView.class;
    }


}