AikarMobFix

gistfile1.java

package com.empireminecraft.AikarMobFix;

import java.util.logging.Logger;

import org.bukkit.Chunk;
import org.bukkit.World;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Monster;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.CreatureSpawnEvent;
import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
import org.bukkit.plugin.java.JavaPlugin;


public class AikarMobFix extends JavaPlugin implements Listener {
	Logger log;
		
	public void onEnable() {
		log = this.getLogger();
		    
		getServer().getPluginManager().registerEvents(this, this);
	}

	private int countMobsInChunk(Chunk chunk) {
		int count = 0;
		for( Entity entity : chunk.getEntities()) {
			if( entity instanceof Monster ) {
				count ++;
			}
		}
		return count;
	}
	
	@SuppressWarnings("unused")
	@EventHandler
	private void entitySpawn(CreatureSpawnEvent event) {
		if( event.getSpawnReason() == SpawnReason.SPAWNER 
		|| (getConfig().getBoolean("limitNatural") && event.getSpawnReason() == SpawnReason.NATURAL)
		) { 
			Chunk chunk = event.getLocation().getChunk();
			
			int mobCount = countMobsInChunk(chunk);
			if( getConfig().getBoolean("countSurrounding") ) { 
				World world = chunk.getWorld();
				mobCount += countMobsInChunk(world.getChunkAt(chunk.getX()+1, chunk.getZ()));
				mobCount += countMobsInChunk(world.getChunkAt(chunk.getX()-1, chunk.getZ()));
				mobCount += countMobsInChunk(world.getChunkAt(chunk.getX(),   chunk.getZ()+1));
				mobCount += countMobsInChunk(world.getChunkAt(chunk.getX(),   chunk.getZ()-1));
			}
			
			if( mobCount > getConfig().getInt("cap.chunk") ) {
				event.setCancelled(true);
			}
		}
	}
}