import java.util.Optional;

public interface PluginManagerInternal extends PluginManager {
    void apply(PluginImplementation<?> plugin);

    <P extends Plugin> P addImperativePlugin(PluginImplementation<P> plugin);

    <P extends Plugin> P addImperativePlugin(Class<P> plugin);

    PluginContainer getPluginContainer();

    <P extends Plugin<?>> Optional<PluginId> findPluginIdForClass(Class<P> plugin);

    }

    @Override
    public <P extends Plugin> P addImperativePlugin(PluginImplementation<P> plugin) {
        doApply(plugin);
        Class<? extends P> pluginClass = plugin.asClass();
        return pluginClass.cast(instances.get(pluginClass));
    }

    @Override
    public <P extends Plugin> P addImperativePlugin(Class<P> type) {
        return addImperativePlugin(pluginRegistry.inspect(type));
    }

        } else {
            return pluginManager.addImperativePlugin(Cast.<PluginImplementation<Plugin<?>>>uncheckedNonnullCast(plugin));
        }
    }

    @Override
    @SuppressWarnings("rawtypes")
    public <P extends Plugin> P apply(Class<P> type) {
        return pluginManager.addImperativePlugin(type);
    }

    @Override
    public boolean hasPlugin(String id) {