Double Jump Plus - Main Class - v1.0

package net.thegamingcraft.DoubleJump;

import java.util.ArrayList;
import java.util.HashMap;

import org.bukkit.Bukkit;
import org.bukkit.Effect;
import org.bukkit.GameMode;
import org.bukkit.block.Block;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.event.player.PlayerToggleFlightEvent;
import org.bukkit.event.player.PlayerToggleSneakEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.Vector;

public class Main extends JavaPlugin implements Listener {

    HashMap<Player, Boolean> cooldown = new HashMap<Player, Boolean>();
    ArrayList<Player> smash = new ArrayList<Player>();

    @Override
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onDamage(EntityDamageEvent e) {
        if (e.getCause() == DamageCause.FALL) {
            if (e.getEntity().getType() == EntityType.PLAYER) {
                Player p = (Player) e.getEntity();

                e.setCancelled(true);

                if (smash.contains(p)) {
                    ArrayList<Block> blocks = new ArrayList<Block>();
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(0, 1, 0)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(1, 1, 0)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(0, 1, 1)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(-1, 1, 0)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(0, 1, -1)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(1, 1, 1)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(-1, 1, -1)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(2, 1, 0)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(-2, 1, 0)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(0, 1, 2)));
                    blocks.add(p.getWorld().getBlockAt(p.getLocation().subtract(0, 1, -2)));

                    for (Block b : blocks) {
                        for (Player pl : Bukkit.getOnlinePlayers()) {
                            pl.playEffect(b.getLocation(), Effect.STEP_SOUND, b.getTypeId());
                        }
                    }

                    smash.remove(p);
                }
            }
        }
    }

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onMove(PlayerMoveEvent e) {
        Player p = e.getPlayer();

        if (p.getGameMode() == GameMode.CREATIVE) return;

        if (cooldown.get(p) != null && cooldown.get(p) == true) {
            p.setAllowFlight(true);
        } else {
            p.setAllowFlight(false);
        }

        if (p.isOnGround()) {
            cooldown.put(p, true);
        }

        if (cooldown.get(p) != null && cooldown.get(p) == false) {
            for (Player pl : Bukkit.getOnlinePlayers()) {
                pl.playEffect(p.getLocation(), Effect.SMOKE, 2004);
            }
        }
    }

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onFly(PlayerToggleFlightEvent e) {
        Player p = e.getPlayer();

        if (p.getGameMode() == GameMode.CREATIVE) return;

        if (cooldown.get(p) == true) {
            e.setCancelled(true);
            cooldown.put(p, false);
            p.setVelocity(p.getLocation().getDirection().multiply(1.6D).setY(1.0D));

            for (Player pl : Bukkit.getOnlinePlayers()) {
                pl.playEffect(p.getLocation(), Effect.MOBSPAWNER_FLAMES, 2004);
            }

            p.setAllowFlight(false);
        }
    }

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onSneak(PlayerToggleSneakEvent e) {
        Player p = e.getPlayer();

        if (p.getGameMode() == GameMode.CREATIVE) return;

        if (p.isOnGround() == false && cooldown.get(p) != null && cooldown.get(p) == false) {
            p.setVelocity(new Vector(0, -5, 0));
            smash.add(p);
        }
    }

}