ChestNuker.java

package me.vemacs.chestnuker;

import org.bukkit.Chunk;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockState;
import org.bukkit.block.Chest;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.HandlerList;
import org.bukkit.event.Listener;
import org.bukkit.event.world.ChunkLoadEvent;
import org.bukkit.plugin.java.JavaPlugin;

import java.util.List;

public class ChestNuker extends JavaPlugin implements Listener {
    public static final String MATCH_STRING = "plot";
    public static final String PARSED_KEY = "parsed";

    @Override
    public void onEnable() {
        saveDefaultConfig();
        getServer().getPluginManager().registerEvents(this, this);
    }

    @Override
    public void onDisable() {
        HandlerList.unregisterAll((Listener) this);
        saveConfig();
    }

    @EventHandler(priority = EventPriority.MONITOR)
    public void onChunkLoad(ChunkLoadEvent event) {
        if (!event.getWorld().getName().contains(MATCH_STRING)) return;
        List<String> parsed = getConfig().getStringList(PARSED_KEY);
        Chunk chunk = event.getChunk();
        String chunkCode = chunk.getX() + "," + chunk.getZ();
        if (parsed.contains(chunkCode)) return;
        for (BlockState bs : chunk.getTileEntities()) {
            if (bs instanceof Chest) {
                Chest chest = (Chest) bs;
                chest.getInventory().clear();
                getLogger().info("Nuking chest at " + bs.getBlock().getLocation().toString());
            }
        }
        parsed.add(chunkCode);
        getConfig().set(PARSED_KEY, parsed);
    }
}