How to compare blocks in hand and in the world?

Plugins Plugin Development
1

For example Ic2:generator:

  1. GetID in hand:
    ItemStack mainHandItem = player.getItemInHand(HandTypes.MAIN_HAND).get();
    DataContainer container = mainHandItem.toContainer();
    DataQuery query = DataQuery.of(’/’, “UnsafeDamage”);

     int unsafeDamage = Integer.parseInt(container.get(query).get().toString());
 String itemId = mainHandItem.getType().getId();
 if (unsafeDamage != 0) {
     itemId = itemId + ":" + unsafeDamage;
 }

Return itemId = “ic2:te:3”.
(mainHandItem.getType().getId() for this example return “ic2:te”, returns this the same for all items from IC2)

  1. GetID from Listener:
    @Listener
    public void onBlockPlace(ChangeBlockEvent.Place event, @Root Player player) {
    BlockSnapshot targetBlock = event.getTransactions().get(0).getFinal();
    final BlockState blockstate = targetBlock .getState();
    ItemStack itemStack = ItemStack.builder().fromBlockState(blockstate).build();
    id = itemStack.getType().getId();// + “.” + itemStack.getItemDamage();

                 DataContainer container = itemStack.toContainer();
             DataQuery query = DataQuery.of('/', "UnsafeDamage");
             int unsafeDamage = Integer.parseInt(container.get(query).get().toString());
             if (unsafeDamage != 0) {
                 id = id + ":" + unsafeDamage;
             }

This code Return Id is only (without “:3”) = “ic2:te”. returns this the same for all items from IC2

It doesn’t work right. How to implement the comparison of blocks in hand and blocks placed in the world?

2

Right. Your going this all wrong. Sponge has never supported BlockId’s nor ItemIds and they are removed in 1.13.

You want to compare the material. This is very simple.

ItemStack itemInHand;
Location<World> blockToCompare;

You need to find a common ground between the two. In this case its its either BlockType or ItemType depending on which one you rather use.

ItemType itemTypeInHand = itemInHand.getType();
BlockType blockType = blockToCompare.getType();

The current problem is you cannot compare a BlockType with a ItemType. So you essentially need to convert one to the other.

For the example im going to show, its going to be conveting the BlockType to an ItemType

Optional<ItemType> opBlock = blockType.getItem();
if(opBlock.isPresent()){
  //Safe to compare using .equals()
}

When you request the itemType from the blockType there is a chance that Sponge has no idea what the ItemType of that block is and thats why it returns optional.

I belive this way works for modded items such as your example of IC2