EraseCommand.java

package net.charter.orion_pax.OasisExtras.Commands;

import java.util.HashSet;
import java.util.Iterator;
import java.util.List;

import net.charter.orion_pax.OasisExtras.OasisExtras;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Item;
import org.bukkit.entity.Player;
import org.bukkit.util.Vector;

public class EraseCommand implements CommandExecutor {

    int radius,x,y,z;
    private Location loc;
    private World world;
    private Vector origin;
    private OasisExtras plugin;
    private List<Entity> list;
    private Iterator<Entity> it;
    public EraseCommand(OasisExtras plugin) {
        this.plugin=plugin;
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(args.length==4){
            final Player player = (Player) sender;
            try {
                x=Integer.parseInt(args[0]);
                y=Integer.parseInt(args[1]);
                z=Integer.parseInt(args[2]);
                radius=Integer.parseInt(args[3]);
            } catch (NumberFormatException e) {
                sender.sendMessage(ChatColor.RED + "Check your arguments! One of them is not a number!");
                return false;
            }
            loc=new Location(player.getWorld(),x,y,z);
            world=loc.getWorld();
            plugin.eList.add(world.getChunkAt(x, z));
            world.loadChunk(x, z);
            for(int x=-radius;x<radius; x = x + 16){
                for(int z=-radius;z<radius;z=z+16){
                    plugin.eList.add(world.getChunkAt(this.x + x, this.z + z));
                    world.loadChunk(this.x + x, this.z + z);
                }
            }
            plugin.getServer().getScheduler().runTaskLater(plugin, new Runnable(){

                @Override
                public void run() {
                    player.sendMessage(ChatColor.RED + Integer.toString(removeEntities(loc.toVector(),radius)) + " items removed!");
                    plugin.eList.clear();
                }

            }, 100L);
            return true;


        }
        sender.sendMessage(ChatColor.RED + "Check your arguments!");
        return false;
    }

    private int removeEntities(Vector origin, int radius){
        int num = 0;
        double radiusSq = Math.pow(radius, 2);
        for(Entity ent : world.getEntities()){
            if(origin.distanceSquared(ent.getLocation().toVector()) > radiusSq){
                continue;
            }
            if(ent instanceof Item){
                ent.remove();
                num++;
            }
        }
        return num;
    }
}