Bukkit

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package asofold.simplyvanish;

import java.util.HashSet;
import java.util.Set;

import org.bukkit.ChatColor;
import org.bukkit.Server;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.EntityTargetEvent;
import org.bukkit.event.player.PlayerDropItemEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerPickupItemEvent;
import org.bukkit.plugin.java.JavaPlugin;

/**
 * Example plugin for the vanish API as of CB 1914 !
 * Vanish + God mode + No Target + No pickup.
 * @author mc_dev
 *
 */
public class SimplyVanish extends JavaPlugin implements Listener {
    
    /**
     * Vanished players.
     */
    Set<String> vanished = new HashSet<String>();

    @Override
    public boolean onCommand(CommandSender sender, Command command,
            String label, String[] args) {
        
        if ( !(sender instanceof Player)){
            sender.sendMessage("[SimplyVanish] Commands are only available for players!");
        }
        Player player = (Player) sender;
        if ( label.equalsIgnoreCase("vanish")){
            if ( !hasPermission(player, "simplyvanish.vanish")){
                player.sendMessage(ChatColor.DARK_RED+"[SimplyVanish] No permission.");
                return false;
            }
            vanish(player);
            return true;
        } else if (label.equalsIgnoreCase("reappear")){
            if ( !hasPermission(player, "simplyvanish.vanish")){
                player.sendMessage(ChatColor.DARK_RED+"[SimplyVanish] No permission.");
                return false;
            }
            reappear(player);
            return true;
        }
        return false;
    }

    @Override
    public void onDisable() {
        System.out.println("[SimplyVanish] Disabled.");
    }

    @Override
    public void onEnable() {
        // just in case quadratic time checking:
        for ( Player player : getServer().getOnlinePlayers()){
            updateVanishState(player);
        }
        getServer().getPluginManager().registerEvents(this, this);
        System.out.println("[SimplyVanish] Enabled");
    }
    
    @EventHandler(priority=EventPriority.MONITOR)
    void onPlayerJoin( PlayerJoinEvent event){
        updateVanishState(event.getPlayer());
    }
    
    @EventHandler(priority=EventPriority.LOW)
    void onEntityTarget(EntityTargetEvent event){
        if ( event.isCancelled() ) return;
        Entity target = event.getTarget();
        if (!(target instanceof Player)) return;
        String playerName = ((Player) target).getName();
        if ( vanished.contains(playerName)) event.setTarget(null);
    }
    
    @EventHandler(priority=EventPriority.LOW)
    void onEntityDamage(EntityDamageEvent event){
        if ( event.isCancelled() ) return;
        Entity entity = event.getEntity();
        if (!(entity instanceof Player)) return;
        String playerName = ((Player) entity).getName();
        if ( !vanished.contains(playerName)) return;
        event.setCancelled(true);
        if ( entity.getFireTicks()>0) entity.setFireTicks(0);
    }
    
    @EventHandler(priority=EventPriority.LOW)
    void onItemPickUp(PlayerPickupItemEvent event){
        if ( event.isCancelled() ) return;
        Player player = event.getPlayer();
        if ( !vanished.contains(player.getName())) return;
        event.setCancelled(true);
    }
    
    @EventHandler(priority=EventPriority.LOW)
    void onItemDrop(PlayerDropItemEvent event){
        if ( event.isCancelled() ) return;
        Player player = event.getPlayer();
        if ( !vanished.contains(player.getName())) return;
        event.setCancelled(true);
    }
    
    public void vanish(Player player) {
        vanished.add(player.getName());
        for ( Player other : getServer().getOnlinePlayers()){
            if (!other.equals(player) && other.canSee(player)){
                if ( !hasPermission(other, "simplyvanish.see-all")) other.hidePlayer(player);
            }
        }
        player.sendMessage(ChatColor.GOLD+"[SimplyVanish] "+ChatColor.GRAY+"You are now "+ChatColor.GREEN+"invisible"+ChatColor.GRAY+" to normal players!");

    }

    public void reappear(Player player) {
        vanished.remove(player.getName());
        for ( Player other : getServer().getOnlinePlayers()){
            if (!other.equals(player) && !other.canSee(player)){
                other.showPlayer(player);
            }
        }
        player.sendMessage(ChatColor.GOLD+"[SimplyVanish] "+ChatColor.GRAY+"You are now "+ChatColor.RED+"visible"+ChatColor.GRAY+" to everyone!");
    }
    
    public void updateVanishState(Player player){
        String playerName = player.getName();
        Server server = getServer();
        if ( vanished.contains(playerName)) vanish(player);
        else{
            for (Player other : server.getOnlinePlayers()){
                if ( !other.canSee(player)) other.showPlayer(player);
            }
        }
        if ( !hasPermission(player, "simplyvanish.see-all")){
            for (String name : vanished){
                if ( name.equals(playerName)) continue;
                Player other = server.getPlayerExact(name);
                if ( other != null){
                    if ( player.canSee(other)) player.hidePlayer(other);
                }
            }
        } else{
            for (String name : vanished){
                if ( name.equals(playerName)) continue;
                Player other = server.getPlayerExact(name);
                if ( other != null){
                    if ( !player.canSee(other)) player.showPlayer(other);
                }
            }
        }
    }

    /**
     * Simplistic.
     * @param player
     * @param perm
     * @return
     */
    boolean hasPermission(Player player, String perm) {
        return player.isOp() || player.hasPermission(perm);
    }

}