@EventHandler
public void onWitherSkullExplosion(EntityDamageByEntityEvent e) {
    if (!witherEnabled
            || !(e.getEntity() instanceof WitherSkull)
            || !plugin.getWorldManager().isSkyAssociatedWorld(e.getEntity().getWorld())) {
        return;
    }
    // Find owner
    ProjectileSource shooter = ((WitherSkull) e.getEntity()).getShooter();
    if (shooter instanceof Wither) {
        handleWitherRampage(e, (Wither) shooter, e.getDamager().getLocation());
    }
}
 

@SuppressWarnings("unchecked")
public <T extends Projectile> T launchProjectile(Class<? extends T> projectile, Vector velocity) {
    net.minecraft.world.World world = ((CraftWorld) getWorld()).getHandle();
    net.minecraft.entity.Entity launch = null;

    if (Snowball.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.projectile.EntitySnowball(world, getHandle());
    } else if (Egg.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.projectile.EntityEgg(world, getHandle());
    } else if (EnderPearl.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.item.EntityEnderPearl(world, getHandle());
    } else if (Arrow.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.projectile.EntityArrow(world, getHandle(), 1);
    } else if (ThrownPotion.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.projectile.EntityPotion(world, getHandle(), CraftItemStack.asNMSCopy(new ItemStack(Material.POTION, 1)));
    } else if (ThrownExpBottle.class.isAssignableFrom(projectile)) {
        launch = new net.minecraft.entity.item.EntityExpBottle(world, getHandle());
    } else if (Fish.class.isAssignableFrom(projectile) && getHandle() instanceof net.minecraft.entity.player.EntityPlayer) {
        launch = new net.minecraft.entity.projectile.EntityFishHook(world, (net.minecraft.entity.player.EntityPlayer) getHandle());
    } else if (Fireball.class.isAssignableFrom(projectile)) {
        Location location = getEyeLocation();
        Vector direction = location.getDirection().multiply(10);

        if (SmallFireball.class.isAssignableFrom(projectile)) {
            launch = new net.minecraft.entity.projectile.EntitySmallFireball(world, getHandle(), direction.getX(), direction.getY(), direction.getZ());
        } else if (WitherSkull.class.isAssignableFrom(projectile)) {
            launch = new net.minecraft.entity.projectile.EntityWitherSkull(world, getHandle(), direction.getX(), direction.getY(), direction.getZ());
        } else {
            launch = new net.minecraft.entity.projectile.EntityLargeFireball(world, getHandle(), direction.getX(), direction.getY(), direction.getZ());
        }

        ((net.minecraft.entity.projectile.EntityFireball) launch).projectileSource = this;
        launch.setLocationAndAngles(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
    }

    Validate.notNull(launch, "Projectile not supported");

    if (velocity != null) {
        ((T) launch.getBukkitEntity()).setVelocity(velocity);
    }

    world.spawnEntityInWorld(launch);
    return (T) launch.getBukkitEntity();
}
 

@Override
public boolean effect(Event event, Player player) {
    PlayerInteractEvent e = (PlayerInteractEvent) event;
    ItemMeta im = e.getPlayer().getItemInHand().getItemMeta();
    List<String> lore = new ArrayList<String>();
    if (!im.hasLore()) {
        lore.add(spells.get(0));
        im.setLore(lore);
        e.getPlayer().getItemInHand().setItemMeta(im);
    }
    lore = im.getLore();
    int lastElement = lore.size() - 1;

    if (e.getAction().toString().startsWith("LEFT")) {

        int nextSpellIndex = spells.indexOf(lore.get(lastElement)) + 1;

        if (nextSpellIndex == 3)
            nextSpellIndex = 0;

        String nextSpell = spells.get(nextSpellIndex);

        lore.set(lastElement, nextSpell);
        im.setLore(lore);
        e.getPlayer().getItemInHand().setItemMeta(im);

        player.sendMessage(ChatColor.GRAY + "Changed Spell to " + nextSpell.split(": ")[1] + ChatColor.GRAY + ".");
        player.getWorld().playEffect(player.getLocation(), Effect.CLICK1, 10);
    } else if (e.getAction().toString().startsWith("RIGHT")) {

        int spell = -1;
        int cost = -1;
        int cooldown = -1;

        // Get all values
        if (lore.get(lastElement).equals(spells.get(0))) {
            spell = 0;
            cost = WitherCost;
            cooldown = WitherCooldown;
        } else if (lore.get(lastElement).equals(spells.get(1))) {
            spell = 1;
            cost = FireballCost;
            cooldown = FireballCooldown;
        } else if (lore.get(lastElement).equals(spells.get(2))) {
            spell = 2;
            cost = LightningCost;
            cooldown = LightningCooldown;
        }

        // Apply costs
        if (player.getInventory().contains(Fuel, cost) || player.getGameMode().equals(GameMode.CREATIVE)) {
            if (!player.getGameMode().equals(GameMode.CREATIVE)) {
                ItemStack mana = new ItemStack(Fuel, cost);
                player.getInventory().removeItem(mana);
                player.updateInventory();
            }

            Location l = player.getLocation();

            // Apply effect
            if (spell == 0) {
                if (Tools.checkWorldGuard(l, player, "PVP", true)) {
                    WitherSkull ws = player.launchProjectile(WitherSkull.class);
                    ws.setVelocity(l.getDirection().multiply(2));
                    if (!Main.createExplosions)
                        ws.setMetadata("ce.explosive", new FixedMetadataValue(getPlugin(), null));
                    EffectManager.playSound(l, "ENTITY_WITHER_IDLE", 0.5f, 10f);
                } else {
                    EffectManager.playSound(l, "ENTITY_CAT_HISS", 0.3f, 5f);
                }
            } else if (spell == 1) {
                player.launchProjectile(SmallFireball.class).setVelocity(l.getDirection().multiply(1.5));
                EffectManager.playSound(l, "ENTITY_BLAZE_HIT", 0.2f, 0f);
            } else if (spell == 2) {
                Location target = player.getTargetBlock((Set<Material>) null, 20).getLocation();
                player.getWorld().strikeLightning(target);
                if (Tools.checkWorldGuard(l, player, "TNT", true))
                    player.getWorld().createExplosion(target, 1);
                EffectManager.playSound(target, "ENTITY_ENDERDRAGON_GROWL", 0.5f, 2f);
            }

            // Generate the cooldown based on the cooldown value
            generateCooldown(player, cooldown);
        } else {
            player.sendMessage(ChatColor.RED + "You need " + cost + " " + Fuel.toString().toLowerCase().replace("_", " ") + " to cast this spell.");
        }

    }
    return false; // The Staff generates it's own cooldowns, so it always
                  // returns false
}
 

@Override
public void onShootBow(EntityShootBowEvent event, DelayedPlayerDetails details) {
	Entity skull = event.getEntity().launchProjectile(WitherSkull.class);
	skull.setVelocity(event.getProjectile().getVelocity());
	event.setProjectile(skull);
}