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--- drafts:resourceconditions [2026/03/03 23:51] – datagen example infinitychances
+++ drafts:resourceconditions [2026/03/20 17:27] (current) – changed example again to not require build script changes infinitychances
@@ Line 215: / Line 215: @@
 This section will assume you have already set up a basic datagen setup. It will use recipes as an example.
-We will create a custom shaped recipe that turns a boiled egg from iljatech into an egg when it is above a water bucket and only when iljatech is loaded.
+We will create a recipe that creates a minecart with copper if the minecart improvements experiment is enabled.
-First, in our build.gradle we would define a dependency on iljatech through modLocalRuntime and modCompileOnly to access its code. However, as it does not have a maven, this is not possible(this mod was chosen just to show a simple example).
 Next, we can go into our recipe provider and begin.
@@ Line 229: / Line 227: @@
 			@Override
 			public void buildRecipes() {
-				shaped(RecipeCategory.FOOD, Items.EGG)
+				shaped(RecipeCategory.MISC, Items.MINECART)
-					.pattern("b")
+					.pattern("c c")
-					.pattern("w")
+					.pattern("ccc")
-					.define('b', ModItems.BOILED_EGG)
+					.define('c', Items.COPPER_INGOT)
-					.define('w', Items.WATER_BUCKET)
+					.unlockedBy(getHasName(Items.COPPER_INGOT), has(Items.COPPER_INGOT))
-					.unlockedBy(getHasName(ModItems.BOILED_EGG), has(ModItems.BOILED_EGG))
+					.save(withConditions(output, new FeaturesEnabledResourceCondition(Identifier.withDefaultNamespace("minecart_improvements");
-					.save(withConditions(output, new AllModsLoadedResourceCondition(List.of("iljatech"))));
 		};
 	}
@@ Line 242: / Line 239: @@
 The important part of this is when we call the save function. We can wrap our RecipeOutput with the withConditions method provided by FabricRecipeProvider, which allows us to place as many conditions as we want.
 The result will be this:
-<code>
+<code >
 {
   "fabric:load_conditions": [
     {
-      "condition": "fabric:all_mods_loaded",
+      "condition": "fabric:features_enabled",
-      "values": [
+      "features": [
-        "iljatech"
+        "minecraft:minecart_improvements"
       ]
     }
   ],
   "type": "minecraft:crafting_shaped",
-  "category": "food",
+  "category": "misc",
   "key": {
-    "b": "iljatech:boiled_egg",
+    "c": "minecraft:copper_ingot",
-    "w": "minecraft:water_bucket"
   },
   "pattern": [
-    "b",
+    "c c",
-    "w"
+    "ccc"
   ],
   "result": {
     "count": 1,
-    "id": "minecraft:egg"
+    "id": "minecraft:minecart"
   }
 }
 </code>
+===== Making A Custom Condition =====
+There are two things you need to do to make a custom condition: 1. Create the class and logic for it. 2. Register it.
+We are going to make a FalseResourceCondition.
+To begin, we must have our class implement ResourceCondition.
+We can make a codec through MapCodec.unit, and we will return to the getType method.
+The test method is where all the logic happens. It passes in a RegistryInfoLookup, which can get you a RegistryInfo from a ResourceKey.
+For our use, we do not need it. We can just return false.
+Your class should currently look something like this:
+<code java [enable_line_numbers="true"]>
+public class FalseResourceCondition implements ResourceCondition {
+    public static final MapCodec<FalseResourceCondition> CODEC = MapCodec.unit(FalseResourceCondition::new);
+    public ResourceConditionType<?> getType() {
+        return TYPE_HERE;
+    }
+    public boolean test(RegistryOps.@Nullable RegistryInfoLookup registryInfo) {
+        return false;
+    }
+}
+</code>
+Now, we must register the condition. You can refer to DefaultResourceConditionTypes to see how they are done.
+A register method will look something like this:
+<code java>
+protected static <T extends ResourceCondition> ResourceConditionType<T> createResourceConditionType(String name, MapCodec<T> codec) {
+	return ResourceConditionType.create(Identifier.fromNamespaceAndPath("tutorial", name), codec);
+}
+</code>
+For name, we can pass in "false", and codec is our ''FalseResourceCondition.CODEC''.
+In your ''ModInitializer'', do something like this:
+<code java>
+public static ResourceConditionType<FalseResourceCondition> FALSE;
+@Override
+public void onInitialize() {
+	FALSE = createResourceConditionType("false", FalseResourceCondition.CODEC)
+	// ...
+}
+protected static <T extends ResourceCondition> ResourceConditionType<T> createResourceConditionType(String name, MapCodec<T> codec) {
+	return ResourceConditionType.create(Identifier.fromNamespaceAndPath("tutorial", name), codec);
+}
+// ...
+</code>
+Now, replace TYPE_HERE with the new condition type.