AbstractMetaData.java

package world.bentobox.boxed.nms;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.bukkit.block.Block;

import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.protocol.game.PacketPlayOutTileEntityData;
import net.minecraft.world.level.block.entity.TileEntity;
import world.bentobox.bentobox.BentoBox;

public abstract class AbstractMetaData {

    public abstract String nmsData(Block block);

    protected String getData(TileEntity te, String method, String field) {
        try {
            // Check if the method 'j' exists
            Method updatePacketMethod = te.getClass().getDeclaredMethod(method);
            if (updatePacketMethod != null) {
                // Invoke the method to get the PacketPlayOutTileEntityData object
                updatePacketMethod.setAccessible(true);
                Object object = updatePacketMethod.invoke(te);
                PacketPlayOutTileEntityData packet = (PacketPlayOutTileEntityData) object;
                //if (object instanceof PacketPlayOutTileEntityData packet) {
                    // Access the private field for the NBTTagCompound getter in PacketPlayOutTileEntityData
                    Field fieldC = packet.getClass().getDeclaredField(field);
                    fieldC.setAccessible(true);
                    NBTTagCompound nbtTag = (NBTTagCompound) fieldC.get(packet);
        
                    return nbtTag.toString(); // This will show what you want
                    //} else {
                    //    throw new ClassNotFoundException(
                    //            object.getClass().getCanonicalName() + " is not a PacketPlayOutTileEntityData");
                    //}
            }
        } catch (Exception e) {
            System.out.println("The method '" + method + "' does not exist in the TileEntity class.");
            e.printStackTrace();
        }
        return "";

    }
}