diff --git a/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/api/object/builder/v1/advancement/CriterionRegistry.java b/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/api/object/builder/v1/advancement/CriterionRegistry.java
new file mode 100644
index 000000000..6e1261bc6
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/api/object/builder/v1/advancement/CriterionRegistry.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.api.object.builder.v1.advancement;
+
+import net.minecraft.advancement.criterion.Criterion;
+import net.minecraft.util.Identifier;
+
+import net.fabricmc.fabric.mixin.object.builder.CriteriaAccessor;
+
+/**
+ * Allows registering advancement criteria for triggers.
+ *
+ *
A registered criterion (trigger) can be retrieved through
+ * {@link net.minecraft.advancement.criterion.Criteria#getById(Identifier)}.
+ *
+ * @see net.minecraft.advancement.criterion.Criteria
+ */
+public final class CriterionRegistry {
+ /**
+ * Registers a criterion for a trigger for advancements.
+ *
+ * @param the criterion's type
+ * @param criterion the criterion registered
+ * @return the criterion registered, for chaining
+ * @throws IllegalArgumentException if a criterion with the same {@link
+ * Criterion#getId() id} exists
+ */
+ public static > T register(T criterion) {
+ CriteriaAccessor.callRegister(criterion);
+ return criterion;
+ }
+}
diff --git a/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/mixin/object/builder/CriteriaAccessor.java b/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/mixin/object/builder/CriteriaAccessor.java
new file mode 100644
index 000000000..1684caf23
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/main/java/net/fabricmc/fabric/mixin/object/builder/CriteriaAccessor.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.mixin.object.builder;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+import net.minecraft.advancement.criterion.Criteria;
+import net.minecraft.advancement.criterion.Criterion;
+
+@Mixin(Criteria.class)
+public interface CriteriaAccessor {
+ @Invoker
+ static > T callRegister(T object) {
+ throw new AssertionError("Mixin dummy");
+ }
+}
diff --git a/fabric-object-builder-api-v1/src/main/resources/assets/fabric-object-builder-v1/icon.png b/fabric-object-builder-api-v1/src/main/resources/assets/fabric-object-builder-api-v1/icon.png
similarity index 100%
rename from fabric-object-builder-api-v1/src/main/resources/assets/fabric-object-builder-v1/icon.png
rename to fabric-object-builder-api-v1/src/main/resources/assets/fabric-object-builder-api-v1/icon.png
diff --git a/fabric-object-builder-api-v1/src/main/resources/fabric-object-builder-v1.mixins.json b/fabric-object-builder-api-v1/src/main/resources/fabric-object-builder-v1.mixins.json
index f7f41f15d..f7e60c94e 100644
--- a/fabric-object-builder-api-v1/src/main/resources/fabric-object-builder-v1.mixins.json
+++ b/fabric-object-builder-api-v1/src/main/resources/fabric-object-builder-v1.mixins.json
@@ -6,6 +6,7 @@
"AbstractBlockAccessor",
"AbstractBlockSettingsAccessor",
"AbstractBlockSettingsMixin",
+ "CriteriaAccessor",
"DefaultAttributeRegistryAccessor",
"DefaultAttributeRegistryMixin",
"MaterialBuilderAccessor",
diff --git a/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/CriterionRegistryTest.java b/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/CriterionRegistryTest.java
new file mode 100644
index 000000000..ef1517e40
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/CriterionRegistryTest.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.test.object.builder;
+
+import com.google.gson.JsonObject;
+
+import net.minecraft.advancement.criterion.ImpossibleCriterion;
+import net.minecraft.predicate.entity.AdvancementEntityPredicateDeserializer;
+import net.minecraft.util.Identifier;
+
+import net.fabricmc.fabric.api.object.builder.v1.advancement.CriterionRegistry;
+
+public final class CriterionRegistryTest {
+ public static void init() {
+ CriterionRegistry.register(new CustomCriterion());
+ }
+
+ static class CustomCriterion extends ImpossibleCriterion {
+ static final Identifier ID = ObjectBuilderTestConstants.id("custom");
+
+ @Override
+ public Identifier getId() {
+ return ID;
+ }
+
+ @Override
+ public Conditions conditionsFromJson(JsonObject jsonObject, AdvancementEntityPredicateDeserializer advancementEntityPredicateDeserializer) {
+ ObjectBuilderTestConstants.LOGGER.info("Loading custom criterion in advancement!");
+ return super.conditionsFromJson(jsonObject, advancementEntityPredicateDeserializer);
+ }
+ }
+}
diff --git a/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/ObjectBuilderTestConstants.java b/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/ObjectBuilderTestConstants.java
new file mode 100644
index 000000000..13679dfa1
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/testmod/java/net/fabricmc/fabric/test/object/builder/ObjectBuilderTestConstants.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.test.object.builder;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import net.minecraft.util.Identifier;
+
+public final class ObjectBuilderTestConstants {
+ public static final String MOD_ID = "fabric-object-builder-api-v1-testmod";
+ public static final Logger LOGGER = LogManager.getLogger(MOD_ID);
+
+ public static Identifier id(String name) {
+ return new Identifier(MOD_ID, name);
+ }
+}
diff --git a/fabric-object-builder-api-v1/src/testmod/resources/assets/fabric-object-builder-api-v1-testmod/icon.png b/fabric-object-builder-api-v1/src/testmod/resources/assets/fabric-object-builder-api-v1-testmod/icon.png
new file mode 100644
index 000000000..2931efbf6
Binary files /dev/null and b/fabric-object-builder-api-v1/src/testmod/resources/assets/fabric-object-builder-api-v1-testmod/icon.png differ
diff --git a/fabric-object-builder-api-v1/src/testmod/resources/data/fabric-object-builder-api-v1-testmod/advancements/criterion_registry_test.json b/fabric-object-builder-api-v1/src/testmod/resources/data/fabric-object-builder-api-v1-testmod/advancements/criterion_registry_test.json
new file mode 100644
index 000000000..d96be7670
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/testmod/resources/data/fabric-object-builder-api-v1-testmod/advancements/criterion_registry_test.json
@@ -0,0 +1,28 @@
+{
+ "display": {
+ "icon": {
+ "item": "minecraft:command_block_minecart"
+ },
+ "title": {
+ "text": "Criterion registry test advancement"
+ },
+ "description": {
+ "text": "Criterion registry test advancement description"
+ },
+ "frame": "task",
+ "show_toast": false,
+ "announce_to_chat": false,
+ "hidden": false,
+ "background": "minecraft:textures/gui/advancements/backgrounds/stone.png"
+ },
+ "criteria": {
+ "custom": {
+ "trigger": "fabric-object-builder-api-v1-testmod:custom"
+ }
+ },
+ "requirements": [
+ [
+ "custom"
+ ]
+ ]
+}
diff --git a/fabric-object-builder-api-v1/src/testmod/resources/fabric.mod.json b/fabric-object-builder-api-v1/src/testmod/resources/fabric.mod.json
new file mode 100644
index 000000000..9fb467867
--- /dev/null
+++ b/fabric-object-builder-api-v1/src/testmod/resources/fabric.mod.json
@@ -0,0 +1,27 @@
+{
+ "schemaVersion": 1,
+ "id": "fabric-object-builder-api-v1-testmod",
+ "name": "Fabric Object Builder API (v1) Test Mod",
+ "version": "${version}",
+ "environment": "*",
+ "license": "Apache-2.0",
+ "icon": "assets/fabric-object-builder-api-v1-testmod/icon.png",
+ "contact": {
+ "homepage": "https://fabricmc.net",
+ "irc": "irc://irc.esper.net:6667/fabric",
+ "issues": "https://github.com/FabricMC/fabric/issues",
+ "sources": "https://github.com/FabricMC/fabric"
+ },
+ "authors": [
+ "FabricMC"
+ ],
+ "depends": {
+ "fabric-object-builder-api-v1": "*"
+ },
+ "description": "Test mod for fabric object builder API v1.",
+ "entrypoints": {
+ "main": [
+ "net.fabricmc.fabric.test.object.builder.CriterionRegistryTest::init"
+ ]
+ }
+}