ItemPosChip.java

package minestrapteam.mods.minestrappolation.item;

import net.minecraft.block.Block;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.BlockPos;
import net.minecraft.util.EnumChatFormatting;
import net.minecraft.util.EnumFacing;
import net.minecraft.world.World;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import java.util.List;

public class ItemPosChip extends Item
{

	public ItemPosChip()
	{
		this.setMaxStackSize(1);
	}

	@Override
	public void onCreated(ItemStack stack, World worldIn, EntityPlayer playerIn)
	{
		if (stack.getTagCompound() == null)
		{
			stack.setTagCompound(new NBTTagCompound());
		}

		if (!worldIn.isRemote)
		{
			stack.getTagCompound().setInteger("x", 0);
			stack.getTagCompound().setInteger("y", 0);
			stack.getTagCompound().setInteger("z", 0);
		}
	}

	@Override
	public boolean onItemUse(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)
	{
		stack.getTagCompound().setInteger("x", pos.getX());
		stack.getTagCompound().setInteger("y", pos.getY());
		stack.getTagCompound().setInteger("z", pos.getZ());
		return true;
	}

	@Override
	@SideOnly(Side.CLIENT)
	public void addInformation(ItemStack stack, EntityPlayer playerIn, List tooltip, boolean advanced)
	{
		if (stack.getTagCompound() == null)
		{
			stack.setTagCompound(new NBTTagCompound());
		}

		if (!stack.getTagCompound().hasKey("x"))
		{

		}
		else
		{
			tooltip.add(EnumChatFormatting.GREEN + playerIn.getEntityWorld().getBlockState(
				new BlockPos(stack.getTagCompound().getInteger("x"), stack.getTagCompound().getInteger("y"),
				             stack.getTagCompound().getInteger("z"))).getBlock().getLocalizedName());
			tooltip.add(
				EnumChatFormatting.GREEN + Integer.toString(stack.getTagCompound().getInteger("x")) + ", " + Integer
					                                                                                             .toString(
						                                                                                             stack
							                                                                                             .getTagCompound()
							                                                                                             .getInteger(
								                                                                                             "y"))
					+ ", " + Integer.toString(stack.getTagCompound().getInteger("z")));
		}
	}

	public Block getStoredBlock(World world, ItemStack stack)
	{
		return world.getBlockState(
			new BlockPos(stack.getTagCompound().getInteger("x"), stack.getTagCompound().getInteger("y"),
			             stack.getTagCompound().getInteger("z"))).getBlock();
	}

	public BlockPos getStoredBlockPos(World world, ItemStack stack)
	{
		return new BlockPos(stack.getTagCompound().getInteger("x"), stack.getTagCompound().getInteger("y"),
		                    stack.getTagCompound().getInteger("z"));
	}
}