public ItemStack b(ISourceBlock isourceblock, ItemStack itemstack) {
    EnumFacing enumfacing = BlockDispenser.b(isourceblock.h());
    double d0 = isourceblock.getX() + (double) enumfacing.c();
    double d1 = (double) ((float) isourceblock.getBlockY() + 0.2F);
    double d2 = isourceblock.getZ() + (double) enumfacing.e();

    // CraftBukkit start
    World world = isourceblock.k();
    ItemStack itemstack1 = itemstack.a(1);
    org.bukkit.block.Block block =
        world
            .getWorld()
            .getBlockAt(
                isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
    CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);

    BlockDispenseEvent event =
        new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(d0, d1, d2));
    if (!BlockDispenser.eventFired) {
      world.getServer().getPluginManager().callEvent(event);
    }

    if (event.isCancelled()) {
      itemstack.count++;
      return itemstack;
    }

    if (!event.getItem().equals(craftItem)) {
      itemstack.count++;
      // Chain to handler for new item
      ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
      IDispenseBehavior idispensebehavior =
          (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
      if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
        idispensebehavior.a(isourceblock, eventStack);
        return itemstack;
      }
    }

    itemstack1 = CraftItemStack.asNMSCopy(event.getItem());
    EntityFireworks entityfireworks =
        new EntityFireworks(
            isourceblock.k(),
            event.getVelocity().getX(),
            event.getVelocity().getY(),
            event.getVelocity().getZ(),
            itemstack1);

    isourceblock.k().addEntity(entityfireworks);
    // itemstack.a(1); // Handled during event processing
    // CraftBukkit end

    return itemstack;
  }
 protected void a(ISourceBlock isourceblock) {
   isourceblock
       .k()
       .triggerEffect(
           1002, isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ(), 0);
 }