CoolerProMC

I made a block entity in forge 1.20.1, I want to prevent hopper from taking input slot item, i tried to override the extractItem method, it prevented hopper from taking input slot item, but the player also unable to take/change the item in input slot unless the slot is empty. public class FluidSeparatorBlockEntity extends BlockEntity implements MenuProvider { private static final int INPUT_SLOT = 0; private final CustomItemHandler itemHandler = new CustomItemHandler(3){ @Override protected void onContentsChanged(int slot) { setChanged(); } @Override public boolean isItemValid(int slot, @NotNull ItemStack stack) { return slot == INPUT_SLOT; } @Override public @NotNull ItemStack extractItem(int slot, int amount, boolean simulate) { if (slot == INPUT_SLOT) { return ItemStack.EMPTY; } return super.extractItem(slot, amount, simulate); } }; private LazyOptional<IItemHandler> lazyItemHandler = LazyOptional.empty(); protected final ContainerData data; private int progress = 0; private int maxProgress = 78; public FluidSeparatorBlockEntity(BlockPos pPos, BlockState pBlockState) { super(ModBlockEntities.FLUID_SEPARATOR_BE.get(), pPos, pBlockState); this.data = new ContainerData() { @Override public int get(int pIndex) { return switch (pIndex) { case 0 -> FluidSeparatorBlockEntity.this.progress; case 1, 2 -> FluidSeparatorBlockEntity.this.maxProgress; default -> 0; }; } @Override public void set(int pIndex, int pValue) { switch (pIndex) { case 0 -> FluidSeparatorBlockEntity.this.progress = pValue; case 1, 2 -> FluidSeparatorBlockEntity.this.maxProgress = pValue; } } @Override public int getCount() { return 3; } }; } @Override public @NotNull <T> LazyOptional<T> getCapability(@NotNull Capability<T> cap, @Nullable Direction side) { if(cap == ForgeCapabilities.ITEM_HANDLER) { return lazyItemHandler.cast(); } return super.getCapability(cap, side); } @Override public void onLoad() { super.onLoad(); lazyItemHandler = LazyOptional.of(() -> itemHandler); } @Override public void invalidateCaps() { super.invalidateCaps(); lazyItemHandler.invalidate(); } public void drops() { SimpleContainer inventory = new SimpleContainer(itemHandler.getSlots()); for(int i = 0; i < itemHandler.getSlots(); i++) { inventory.setItem(i, itemHandler.getStackInSlot(i)); } Containers.dropContents(this.level, this.worldPosition, inventory); } @Override public Component getDisplayName() { return Component.translatable("block.chemmaster.fluid_separator"); } @Nullable @Override public AbstractContainerMenu createMenu(int pContainerId, Inventory pPlayerInventory, Player pPlayer) { return new FluidSeparatorMenu(pContainerId, pPlayerInventory, this, this.data); } @Override protected void saveAdditional(CompoundTag pTag) { pTag.put("inventory", itemHandler.serializeNBT()); pTag.putInt("fluid_separator.progress", progress); super.saveAdditional(pTag); } @Override public void load(CompoundTag pTag) { super.load(pTag); itemHandler.deserializeNBT(pTag.getCompound("inventory")); progress = pTag.getInt("fluid_separator.progress"); } public void tick(Level pLevel, BlockPos pPos, BlockState pState) { ItemStack inputStack = this.itemHandler.getStackInSlot(INPUT_SLOT); if (inputStack.getCount() < 2) { resetProgress(); return; } if(hasRecipe()) { increaseCraftingProgress(); setChanged(pLevel, pPos, pState); if(hasProgressFinished()) { craftItem(); resetProgress(); } } else { resetProgress(); } } private void resetProgress() { progress = 0; } private void craftItem() { Optional<FluidSeparatingRecipe> recipe = getCurrentRecipe(); if (recipe.isPresent()) { List<ItemStack> results = recipe.get().getOutputs(); ItemStack inputStack = this.itemHandler.getStackInSlot(INPUT_SLOT); if (inputStack.getCount() < 2) { // If there are not enough items, do not proceed with crafting return; } // Extract the input item from the input slot this.itemHandler.internalExtractItem(INPUT_SLOT, 2, false); // Loop through each result item and find suitable output slots for (ItemStack result : results) { int outputSlot = findSuitableOutputSlot(result); if (outputSlot != -1) { this.itemHandler.setStackInSlot(outputSlot, new ItemStack(result.getItem(), this.itemHandler.getStackInSlot(outputSlot).getCount() + result.getCount())); } else { // Handle the case where no suitable output slot is found // This can be logging an error, throwing an exception, or any other handling logic System.err.println("No suitable output slot found for item: " + result); } } } } private int findSuitableOutputSlot(ItemStack result) { // Implement logic to find a suitable output slot for the given result // Return the slot index or -1 if no suitable slot is found for (int i = 0; i < this.itemHandler.getSlots(); i++) { // Ensure we do not place the output item in the input slot if (i == INPUT_SLOT) { continue; } ItemStack stackInSlot = this.itemHandler.getStackInSlot(i); if (stackInSlot.isEmpty() || (stackInSlot.getItem() == result.getItem() && stackInSlot.getCount() + result.getCount() <= stackInSlot.getMaxStackSize())) { return i; } } return -1; } private boolean hasRecipe() { Optional<FluidSeparatingRecipe> recipe = getCurrentRecipe(); if (recipe.isEmpty()) { return false; } List<ItemStack> results = recipe.get().getOutputs(); for (ItemStack result : results) { if (!canInsertAmountIntoOutputSlot(result) || !canInsertItemIntoOutputSlot(result.getItem())) { return false; } } return true; } private Optional<FluidSeparatingRecipe> getCurrentRecipe(){ SimpleContainer inventory = new SimpleContainer(this.itemHandler.getSlots()); for (int i = 0; i < itemHandler.getSlots(); i++) { inventory.setItem(i, this.itemHandler.getStackInSlot(i)); } return this.level.getRecipeManager().getRecipeFor(FluidSeparatingRecipe.Type.INSTANCE, inventory, level); } private boolean canInsertAmountIntoOutputSlot(ItemStack result) { for (int i = 1; i < this.itemHandler.getSlots(); i++) { ItemStack stackInSlot = this.itemHandler.getStackInSlot(i); if (stackInSlot.isEmpty() || (stackInSlot.getItem() == result.getItem() && stackInSlot.getCount() + result.getCount() <= stackInSlot.getMaxStackSize())) { return true; } } return false; } private boolean canInsertItemIntoOutputSlot(Item item) { for (int i = 1; i < this.itemHandler.getSlots(); i++) { ItemStack stackInSlot = this.itemHandler.getStackInSlot(i); if (stackInSlot.isEmpty() || stackInSlot.getItem() == item) { return true; } } return false; } private boolean hasProgressFinished() { return progress >= maxProgress; } private void increaseCraftingProgress() { progress++; } }