OnlinePlayerMapAdapter.java

package tc.oc.commons.bukkit.util;

import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.plugin.Plugin;

import java.util.Map;
import javax.inject.Inject;

/**
 * Uses {@link ListeningMapAdapter} to guarantee that the map only contains online players.
 */
public class OnlinePlayerMapAdapter<V> extends ListeningMapAdapter<Player, V> implements Listener {

    @Inject public OnlinePlayerMapAdapter(Plugin plugin) {
        super(plugin);
    }

    public OnlinePlayerMapAdapter(Map<Player, V> map, Plugin plugin) {
        super(map, plugin);
    }

    @Override
    public boolean isValid(Player key) {
        return key.willBeOnline();
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onPlayerQuit(PlayerQuitEvent event) {
        this.remove(event.getPlayer());
    }

    @Override
    protected Map<Player, V> delegate() {
        return this.map;
    }
}