Fly

package com.nappo.bukkit;

import java.util.ArrayList;

import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Event;
import org.bukkit.event.Event.Priority;
import org.bukkit.event.player.PlayerListener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

/**
 * Allows players to fly.
 * @author Canownueasy
 */
public class FlyPlugin extends JavaPlugin {

    private ArrayList<Player> flyers = new ArrayList<Player>();

    @Override
    public void onDisable() { flyers.clear(); }

    @Override
    public void onEnable() {
        PluginManager pm = getServer().getPluginManager();

        pm.registerEvent(Event.Type.PLAYER_MOVE, new PlayerListener() {
            @Override
            public void onPlayerMove(PlayerMoveEvent event) {
                Player player = event.getPlayer();
                if(flyers.contains(player)) {
                    Block to = player.getWorld().getBlockAt(event.getTo());
                    if(to.getType().equals(Material.AIR)) to.setType(Material.WATER);
                    Block from = player.getWorld().getBlockAt(event.getFrom());
                    if(from.getType().equals(Material.WATER)) from.setType(Material.AIR);
                }
            }
        }, Priority.Normal, this);
        getCommand("fly").setExecutor(new CommandExecutor() {

            @Override
            public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
                if(sender instanceof Player) {
                    if(flyers.contains((Player)sender)) {
                        if(flyers.remove((Player)sender)) sender.sendMessage("You have stopped flying!"); return true;
                    }
                    if(flyers.add((Player)sender)) sender.sendMessage("You are now flying!"); return true;
                }
                return false;
            }
        });
    }



}