Spawner class

package laviRZ.bukkit.BedWars;




import java.util.TreeMap;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.Server;
import org.bukkit.inventory.ItemStack;
import org.bukkit.util.Vector;

public class Spawner {

    public String oName;
    private int ticks = 0;
    private Location location;
    private boolean enabled = false;
    private int ironRate, goldRate, emeraldRate;

    ItemStack ironIngot = new ItemStack(Material.IRON_INGOT, 1);
    ItemStack goldIngot = new ItemStack(Material.GOLD_INGOT, 1);
    ItemStack emerald = new ItemStack(Material.EMERALD, 1);

    public static Server server;

    public Spawner(final Location location, String name, Main main) {
        this.location = location;
        oName = name;
        ticks = 0;
        Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(main, new Runnable() {

            public void run() {
                if(enabled) {
                    if(ironRate != 0 && ticks % ironRate == 0) {
                        location.getWorld().dropItem(location, ironIngot).setVelocity(new Vector(0, 0.1, 0));
                    }
                    if(goldRate != 0 && ticks % goldRate == 0) {
                        location.getWorld().dropItem(location, goldIngot).setVelocity(new Vector(0, 0.1, 0));
                    }
                    if(emeraldRate != 0 && (ticks % emeraldRate == 0)) {
                        location.getWorld().dropItem(location, emerald).setVelocity(new Vector(0, 0.1, 0));
                    }
                    ticks++;
                }
            }

        }, 20, 1);
    }

    public Spawner(TreeMap<String, Object> values, Main main) {
        location = new Location(Bukkit.getServer().getWorld((String) values.get("world")), 0, 0, 0);
        ticks = 0;
        oName = (String) values.get("name");
        ticks = Integer.parseInt((String) values.get("ticks"));
        location.setX(Double.parseDouble((String) values.get("x")));
        location.setY(Double.parseDouble((String) values.get("y")));
        location.setZ(Double.parseDouble((String) values.get("z")));
        enabled = Boolean.parseBoolean((String) values.get("enabled"));
        ironRate = Integer.parseInt((String) values.get("ironRate"));
        goldRate = Integer.parseInt((String) values.get("goldRate"));
        emeraldRate = Integer.parseInt((String) values.get("emeraldRate"));
        Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(main, new Runnable() {
            public void run() {
                if(enabled) {
                    if(ironRate != 0 && ticks % ironRate == 0) {
                        location.getWorld().dropItem(location, ironIngot).setVelocity(new Vector(0, 0.1, 0));
                    }
                    if(goldRate != 0 && ticks % goldRate == 0) {
                        location.getWorld().dropItem(location, goldIngot).setVelocity(new Vector(0, 0.1, 0));
                    }
                    if(emeraldRate != 0 && (ticks % emeraldRate == 0)) {
                        location.getWorld().dropItem(location, emerald).setVelocity(new Vector(0, 0.1, 0));
                    }
                    ticks++;
                }
            }

        }, 20, 1);
    }

    public void setIronRate(int ironR) {
        ironRate = ironR;
    }

    public void setGoldRate(int goldR) {
        goldRate = goldR;
    }

    public void setEmeraldRate(int emeraldR) {
        emeraldRate = emeraldR;
    }

    public Location getLocation() {
        return location;
    }

    public void setEnable(boolean set) {
        enabled = set;
    }

    public boolean getEnable() {
        return enabled;
    }

    public TreeMap<String, Object> getData() {
        TreeMap<String, Object> data = new TreeMap<String, Object>();

        data.put("name", oName);
        data.put("ticks", Integer.toString(ticks));
        data.put("x", Double.toString(location.getX()));
        data.put("y", Double.toString(location.getY()));
        data.put("z", Double.toString(location.getZ()));
        data.put("world", location.getWorld().getName());
        data.put("enabled", Boolean.toString(enabled));
        data.put("ironRate", Integer.toString(ironRate) );
        data.put("goldRate", Integer.toString(goldRate));
        data.put("emeraldRate", Integer.toString(emeraldRate));

        return data;
    }

}