Minestom/src/main/java/fr/themode/minestom/Viewable.java

package fr.themode.minestom;

import fr.themode.minestom.entity.Player;

import java.util.Set;

public interface Viewable {

    void addViewer(Player player);

    void removeViewer(Player player);

    Set<Player> getViewers();

    default boolean isViewer(Player player) {
        return getViewers().contains(player);
    }

}