トロッコ自動破壊プラグインのコード

FragileCart.java

package com.troidworks.fragilecart;

import org.bukkit.Material;
import org.bukkit.entity.*;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerLoginEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.event.vehicle.VehicleExitEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.metadata.FixedMetadataValue;
import org.bukkit.metadata.MetadataValue;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.List;
import java.util.logging.Logger;

/**
 * Created with IntelliJ IDEA.
 * User: Karno
 * Date: 13/08/08
 * Time: 23:12
 * To change this template use File | Settings | File Templates.
 */
public class FragileCart extends JavaPlugin implements Listener {
    static final String TICKET = "com.troidworks.fragilecart::VehicleTicket";

    static Logger logger = null;

    @Override
    public void onEnable() {
        logger = this.getLogger();
        // register listener
        this.getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onPlayerGetOff(VehicleExitEvent event) {
        // if player being logged log out, ignore exit event
        if (!checkMetadata(event.getExited())) {
            return;
        }
        Vehicle vehicle = event.getVehicle();
        if (vehicle instanceof Minecart) {
            Minecart cart = (Minecart) vehicle;
            cart.getWorld().dropItemNaturally(cart.getLocation(),
                    new ItemStack(Material.MINECART, 1));
            cart.remove();
        }
    }

    private boolean checkMetadata(LivingEntity entity) {
        List<MetadataValue> metadata = entity.getMetadata(TICKET);
        return metadata.size() == 1 && metadata.get(0).asBoolean();
    }

    @EventHandler
    public void onPlayerLoggedIn(PlayerLoginEvent event) {
        event.getPlayer().setMetadata(TICKET, new FixedMetadataValue(this, true));
    }

    @EventHandler
    public void onPlayerLoggedOut(PlayerQuitEvent event) {
        event.getPlayer().setMetadata(TICKET, new FixedMetadataValue(this, false));
    }
}