Stack Command

package de.SkyPvP.System.Commands;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;

import de.SkyPvP.System.Data.Data;

public class Command_Stack implements CommandExecutor, Listener {

	@SuppressWarnings("deprecation")
	@Override
	public boolean onCommand(CommandSender sender, Command cmd, String str,
			String[] args) {
		if ((sender instanceof Player)) {
			Player p = (Player) sender;
			if (cmd.getName().equalsIgnoreCase("stack")) {
				if (p.hasPermission("system.stack")) {
					boolean ignoreMax = true;
					ItemStack[] items = p.getInventory().getContents();
					int len = items.length;

					int affected = 0;
					for (int i = 0; i < len; i++) {
						ItemStack item = items[i];
						if ((item != null)
								&& (item.getAmount() > 0)
								&& ((ignoreMax) || (item.getMaxStackSize() != 1))) {
							int max = ignoreMax ? 64 : item.getMaxStackSize();
							if (item.getAmount() < max) {
								int needed = max - item.getAmount();
								for (int j = i + 1; j < len; j++) {
									ItemStack item2 = items[j];
									if ((item2 != null)
											&& (item2.getAmount() > 0)
											&& ((ignoreMax) || (item
													.getMaxStackSize() != 1))) {
										if ((item2.getTypeId() == item
												.getTypeId())
												&& (item.getDurability() == item2
														.getDurability())
												&& (((item.getItemMeta() == null) && (item2
														.getItemMeta() == null)) || ((item
														.getItemMeta() != null) && (item
														.getItemMeta()
														.equals(item2
																.getItemMeta()))))) {
											if (item2.getAmount() > needed) {
												item.setAmount(max);
												item2.setAmount(item2
														.getAmount() - needed);
												break;
											}
											items[j] = null;
											item.setAmount(item.getAmount()
													+ item2.getAmount());
											needed = max - item.getAmount();

											affected++;
										}
									}
								}
							}
						}
					}
					if (affected > 0) {
						p.getInventory().setContents(items);
					}
					p.sendMessage(Data.Prefix +"§7Alle deine Items wurden gestackt!");
				}else{
					p.sendMessage(Data.NOPERM);
				}
			}
		}
		return false;
	}

}