I'm attempting to use the well-known "Coordinate Cache" item to assign NBT values to another item.

 

Here's the Coordinate Cache item Class:

 

package com.example.ubiquity.items;

import java.util.List;
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;

public class SwordCache extends Item{
@Override
public boolean onItemUse(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)
{
	if(!playerIn.isSneaking()){
		if(stack.getTagCompound() == null ){
			stack.setTagCompound(new NBTTagCompound());
		}
		NBTTagCompound posnbt = new NBTTagCompound();
		posnbt.setInteger("posX", pos.getX());
		posnbt.setInteger("posY", pos.getY());
		posnbt.setInteger("posZ", pos.getZ());
		stack.getTagCompound().setTag("coords", posnbt);
		stack.setStackDisplayName(EnumChatFormatting.GOLD + "Ubiquitous Link");
	}return true;
}
@Override
public ItemStack onItemRightClick(ItemStack stack, World worldIn, EntityPlayer playerIn){
if (playerIn.isSneaking()){
		if(stack.getTagCompound() != null){
			stack.getTagCompound().removeTag("coords");
			stack.clearCustomName();
		}
	}
	return stack;
}
@Override
@SideOnly(Side.CLIENT)
@SuppressWarnings("unchecked")
public void addInformation(ItemStack stack, EntityPlayer playerIn, List list, boolean advanced){
	if(stack.getTagCompound() != null){
		if(stack.getTagCompound().hasKey("coords")){
			NBTTagCompound posnbt = (NBTTagCompound) stack.getTagCompound().getTag("coords");
			int posX = posnbt.getInteger("posX");
			int posY = posnbt.getInteger("posY");
			int posZ = posnbt.getInteger("posZ");
			list.add("This item is bound to");
			list.add("X: " + posX + " Y: " + posY + " Z: " + posZ);
		}
	}
}
@Override
@SideOnly(Side.CLIENT)
public boolean hasEffect(ItemStack stack){
	NBTTagCompound nbtTagCompound = stack.getTagCompound();
	if(nbtTagCompound != null){
		return stack.getTagCompound().hasKey("coords");
	}
	return stack.isItemEnchanted();
}
}

 

My question is about this line in the OnItemUse method...

if(!playerIn.isSneaking()){

 

How can I change this to see if the player has another item, called "Coordinate Key", and then store the following NBT information in said item?

Iterate through the player's inventory and, if you find the ItemStack containing said item, you can add NBT to it with the instance you have from your for loop.

 

Pseudo-code with potentially dodgy syntax:

for (ItemStack stack : player.inventory) {
  if (stack != null && stack.getItem() == itemYouWant) {
     // modify and/or set the stack's tag compound
  }
}

Iterate through the player's inventory and, if you find the ItemStack containing said item, you can add NBT to it with the instance you have from your for loop.

 

Pseudo-code with potentially dodgy syntax:

for (ItemStack stack : player.inventory) {
  if (stack != null && stack.getItem() == itemYouWant) {
     // modify and/or set the stack's tag compound
  }
}

 

How would I parse itemYouWant?

Items.stick? Items.apple? YourModItems.crystalKey? Whichever Item you are searching for. And be sure to put a

'break;' statement after you find it, since you don't need to keep looking.

Items.stick? Items.apple? YourModItems.crystalKey? Whichever Item you are searching for. And be sure to put a

'break;' statement after you find it, since you don't need to keep looking.

 

Ah, okay. I was specifically talking about defining a mod item, wasn't sure how to do that, sorry!