Adds EntityAttributes (#83)

* Adds EntityAttributes

Signed-off-by: shedaniel <daniel@shedaniel.me>

* Switch to ConcurrentHashMap

Signed-off-by: shedaniel <daniel@shedaniel.me>

common/src/main/java/me/shedaniel/architectury/registry/entity/EntityAttributes.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package me.shedaniel.architectury.registry.entity;
+
+import me.shedaniel.architectury.annotations.ExpectPlatform;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
+
+import java.util.function.Supplier;
+
+public final class EntityAttributes {
+    private EntityAttributes() {}
+    
+    /**
+     * Registers default attributes to entities.
+     *
+     * @param type      the type of entity
+     * @param attribute the attributes to register
+     * @see net.minecraft.world.entity.ai.attributes.DefaultAttributes
+     */
+    @ExpectPlatform
+    public static void register(Supplier<EntityType<? extends LivingEntity>> type, Supplier<AttributeSupplier.Builder> attribute) {
+        throw new AssertionError();
+    }
+}

fabric/src/main/java/me/shedaniel/architectury/registry/entity/fabric/EntityAttributesImpl.java

@@ -0,0 +1,33 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package me.shedaniel.architectury.registry.entity.fabric;
+
+import net.fabricmc.fabric.api.object.builder.v1.entity.FabricDefaultAttributeRegistry;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
+
+import java.util.function.Supplier;
+
+public class EntityAttributesImpl {
+    public static void register(Supplier<EntityType<? extends LivingEntity>> type, Supplier<AttributeSupplier.Builder> attribute) {
+        FabricDefaultAttributeRegistry.register(type.get(), attribute.get());
+    }
+}

forge/src/main/java/me/shedaniel/architectury/registry/entity/forge/EntityAttributesImpl.java

@@ -0,0 +1,54 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package me.shedaniel.architectury.registry.entity.forge;
+
+import me.shedaniel.architectury.forge.ArchitecturyForge;
+import me.shedaniel.architectury.platform.forge.EventBuses;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
+import net.minecraftforge.event.entity.EntityAttributeCreationEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Supplier;
+
+public class EntityAttributesImpl {
+    private static final Map<Supplier<EntityType<? extends LivingEntity>>, Supplier<AttributeSupplier.Builder>> ATTRIBUTES = new ConcurrentHashMap<>();
+    
+    public static void register(Supplier<EntityType<? extends LivingEntity>> type, Supplier<AttributeSupplier.Builder> attribute) {
+        ATTRIBUTES.put(type, attribute);
+    }
+    
+    static {
+        EventBuses.onRegistered(ArchitecturyForge.MOD_ID, bus -> {
+            bus.register(EntityAttributesImpl.class);
+        });
+    }
+    
+    @SubscribeEvent
+    public static void event(EntityAttributeCreationEvent event) {
+        for (Map.Entry<Supplier<EntityType<? extends LivingEntity>>, Supplier<AttributeSupplier.Builder>> entry : ATTRIBUTES.entrySet()) {
+            event.put(entry.getKey().get(), entry.getValue().get().build());
+        }
+    }
+}