NoSpambots Bukkit plugin

NoSpambots

package main.java.net.bigbadcraft.nospambots;

import java.util.HashMap;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.player.AsyncPlayerChatEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class NoSpambots extends JavaPlugin implements Listener {

	private final String bypass_permission = "nospambots.bypass";
	private HashMap<String, Location> locations = new HashMap<String, Location>();
	
	public void onEnable() {
		getServer().getPluginManager().registerEvents(this, this);
	}
	
	@EventHandler
	public void onJoin(PlayerJoinEvent e) {
		Player player = e.getPlayer();
		Location loc = player.getLocation();
		if (!player.hasPermission(bypass_permission)) {
			locations.put(player.getName(), loc);
		}
	}
	
	@EventHandler
	public void onMove(PlayerMoveEvent e) {
		Player player = e.getPlayer();
		if (locations.containsKey(player.getName())) {
			Location loc = locations.get(player.getName());
			if (player.getLocation().distance(loc) >= 1) {
				locations.remove(player.getName());
				player.sendMessage(ChatColor.GREEN + "You are now free to chat.");
			}
		}
	}
	
	@EventHandler(priority=EventPriority.MONITOR, ignoreCancelled=true)
	public void onChat(AsyncPlayerChatEvent e) {
		Player player = e.getPlayer();
		if (locations.containsKey(player.getName())) {
			e.setCancelled(true);
			player.sendMessage(ChatColor.RED + "You must move a block to chat.");
		}
	}
	
}