Revered API changes

Because I obviously don't know what I'm doing. Building the jar wasn't working, so reverted for now.

src/main/java/wayoftime/bloodmagic/api/SerializerHelper.java

@@ -0,0 +1,129 @@
+package wayoftime.bloodmagic.api;
+
+import javax.annotation.Nonnull;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonSyntaxException;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+
+import net.minecraft.fluid.Fluid;
+import net.minecraft.fluid.Fluids;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.crafting.ShapedRecipe;
+import net.minecraft.nbt.CompoundNBT;
+import net.minecraft.nbt.JsonToNBT;
+import net.minecraft.util.JSONUtils;
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.fluids.FluidStack;
+import net.minecraftforge.registries.ForgeRegistries;
+import wayoftime.bloodmagic.util.Constants;
+
+/**
+ * Copied liberally from Mekanism. Thanks, pupnewfster!
+ *
+ */
+public class SerializerHelper
+{
+	private SerializerHelper()
+	{
+	}
+
+	private static final Gson GSON = new GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();
+
+	private static void validateKey(@Nonnull JsonObject json, @Nonnull String key)
+	{
+		if (!json.has(key))
+		{
+			throw new JsonSyntaxException("Missing '" + key + "', expected to find an object");
+		}
+		if (!json.get(key).isJsonObject())
+		{
+			throw new JsonSyntaxException("Expected '" + key + "' to be an object");
+		}
+	}
+
+	public static ItemStack getItemStack(@Nonnull JsonObject json, @Nonnull String key)
+	{
+		validateKey(json, key);
+		return ShapedRecipe.deserializeItem(JSONUtils.getJsonObject(json, key));
+	}
+
+	public static JsonElement serializeItemStack(@Nonnull ItemStack stack)
+	{
+		JsonObject json = new JsonObject();
+		json.addProperty(Constants.JSON.ITEM, stack.getItem().getRegistryName().toString());
+		if (stack.getCount() > 1)
+		{
+			json.addProperty(Constants.JSON.COUNT, stack.getCount());
+		}
+		if (stack.hasTag())
+		{
+			json.addProperty(Constants.JSON.NBT, stack.getTag().toString());
+		}
+		return json;
+	}
+
+	public static FluidStack getFluidStack(@Nonnull JsonObject json, @Nonnull String key)
+	{
+		validateKey(json, key);
+		return deserializeFluid(JSONUtils.getJsonObject(json, key));
+	}
+
+	public static FluidStack deserializeFluid(@Nonnull JsonObject json)
+	{
+		if (!json.has(Constants.JSON.AMOUNT))
+		{
+			throw new JsonSyntaxException("Expected to receive a amount that is greater than zero");
+		}
+		JsonElement count = json.get(Constants.JSON.AMOUNT);
+		if (!JSONUtils.isNumber(count))
+		{
+			throw new JsonSyntaxException("Expected amount to be a number greater than zero.");
+		}
+		int amount = count.getAsJsonPrimitive().getAsInt();
+		if (amount < 1)
+		{
+			throw new JsonSyntaxException("Expected amount to be greater than zero.");
+		}
+		ResourceLocation resourceLocation = new ResourceLocation(JSONUtils.getString(json, Constants.JSON.FLUID));
+		Fluid fluid = ForgeRegistries.FLUIDS.getValue(resourceLocation);
+		if (fluid == null || fluid == Fluids.EMPTY)
+		{
+			throw new JsonSyntaxException("Invalid fluid type '" + resourceLocation + "'");
+		}
+		CompoundNBT nbt = null;
+		if (json.has(Constants.JSON.NBT))
+		{
+			JsonElement jsonNBT = json.get(Constants.JSON.NBT);
+			try
+			{
+				if (jsonNBT.isJsonObject())
+				{
+					nbt = JsonToNBT.getTagFromJson(GSON.toJson(jsonNBT));
+				} else
+				{
+					nbt = JsonToNBT.getTagFromJson(JSONUtils.getString(jsonNBT, Constants.JSON.NBT));
+				}
+			} catch (CommandSyntaxException e)
+			{
+				throw new JsonSyntaxException("Invalid NBT entry for fluid '" + resourceLocation + "'");
+			}
+		}
+		return new FluidStack(fluid, amount, nbt);
+	}
+
+	public static JsonElement serializeFluidStack(@Nonnull FluidStack stack)
+	{
+		JsonObject json = new JsonObject();
+		json.addProperty(Constants.JSON.FLUID, stack.getFluid().getRegistryName().toString());
+		json.addProperty(Constants.JSON.AMOUNT, stack.getAmount());
+		if (stack.hasTag())
+		{
+			json.addProperty(Constants.JSON.NBT, stack.getTag().toString());
+		}
+		return json;
+	}
+}