Java Code Examples for net.minecraft.block.Block#canPlaceBlockAt()

/** Attempts to place down a backpack, unequipping it
 *  if the specified entity is currently wearing it. */
public static boolean placeBackpack(World world, BlockPos pos, ItemStack stack,
                                    EntityLivingBase entity, boolean ignoreEntities) {
	
	EntityPlayer player = ((entity instanceof EntityPlayer) ? (EntityPlayer)entity : null);
	if ((player != null) && !player.canPlayerEdit(pos, EnumFacing.UP, stack))
		return false;
	// TODO: Should permission things be handled outside the API method?
	// TODO: For mobs, use mob griefing gamerule?
	
	Item item = stack.getItem();
	// Would use this instead, but gotta avoid depending on the rest of WearableBackpacks.
	//Block block = MiscUtils.getBlockFromItem(item);
	Block block = Block.REGISTRY.getObject(item.getRegistryName());
	if (ignoreEntities ? !block.canPlaceBlockAt(world, pos)
	                   : !world.mayPlace(block, pos, false, EnumFacing.UP, null))
		return false;
	
	// Actually go ahead and try to set the block in the world.
	IBlockState state = block.getStateForPlacement(
		world, pos, EnumFacing.UP, 0.5F, 0.5F, 0.5F,
		item.getMetadata(stack.getMetadata()), player, EnumHand.MAIN_HAND);
	if (!world.setBlockState(pos, state, 3) ||
	    (world.getBlockState(pos).getBlock() != block)) return false;
	block.onBlockPlacedBy(world, pos, state, entity, stack);
	
	double x = pos.getX() + 0.5;
	double y = pos.getY() + 0.5;
	double z = pos.getZ() + 0.5;
	SoundType sound = block.getSoundType(state, world, pos, entity);
	world.playSound(x, y, z, sound.getPlaceSound(), SoundCategory.BLOCKS,
	                (sound.getVolume() + 1.0F) / 2.0F, sound.getPitch() * 0.8F, false);

	// This is used to transfer the BlockEntityTag from Ctrl+pick-blocking to the world.
	boolean alreadyConfigured = ItemBlock.setTileEntityNBT(world, player, pos, stack);

	TileEntity tileEntity = world.getTileEntity(pos);
	if (tileEntity == null) return true;
	IBackpack placedBackpack = BackpackHelper.getBackpack(tileEntity);
	if (placedBackpack == null) return true;
	
	IBackpack carrierBackpack = BackpackHelper.getBackpack(entity);
	boolean isEquipped = ((carrierBackpack != null) && (carrierBackpack.getStack() == stack));
	
	ItemStack stackOrig = stack;
	// Create a copy of the stack with stackSize set to 1 and transfer it.
	stack = stack.copy();
	stack.setCount(1);
	if (stack.hasTagCompound() && stack.getTagCompound().hasKey("BlockEntityTag")) {
		stack.getTagCompound().removeTag("BlockEntityTag");
	}
	placedBackpack.setStack(stack);
	
	if (!alreadyConfigured) {
		// If the carrier had the backpack equipped, transfer data and unequip.
		if (isEquipped) {
			
			IBackpackType type = carrierBackpack.getType();
			IBackpackData data = carrierBackpack.getData();
			if ((data == null) && !world.isRemote) {
				LOG.error("Backpack data was null when placing down equipped backpack");
				data = type.createBackpackData(stack);
			}
			
			placedBackpack.setData(data);
			
			if (!world.isRemote)
				BackpackHelper.setEquippedBackpack(entity, ItemStack.EMPTY, null);
			
			type.onUnequip(entity, tileEntity, placedBackpack);
			
		// Otherwise create a fresh backpack data on the server.
		} else if (!world.isRemote) placedBackpack.setData(
			placedBackpack.getType().createBackpackData(stack));
	}
	
	// We only shrink the original stack here instead of earlier
	// as its information is still needed for other checks, and
	// shrinking it from 1 to 0 would effectively empty the stack.
	stackOrig.shrink(1);
	return true;
	
}