Custom spawn eggs

src/main/java/com/technovision/tutorial/Tutorial.java

@@ -4,10 +4,15 @@ import com.technovision.tutorial.entities.HogEntity;
 import com.technovision.tutorial.init.ModBlocks;
 import com.technovision.tutorial.init.ModEntityType;
 import com.technovision.tutorial.init.ModItems;
+import com.technovision.tutorial.items.ModSpawnEgg;
+import net.minecraft.entity.EntityType;
 import net.minecraft.entity.ai.attributes.GlobalEntityTypeAttributes;
 import net.minecraft.item.ItemGroup;
 import net.minecraft.item.ItemStack;
+import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.RegistryEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.DeferredWorkQueue;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
@@ -17,6 +22,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 @Mod("tutorial")
+@Mod.EventBusSubscriber(modid = Tutorial.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD, value = Dist.CLIENT)
 public class Tutorial {
 
     public static final Logger LOGGER = LogManager.getLogger();
@@ -49,4 +55,9 @@ public class Tutorial {
         }
     };
 
+    @SubscribeEvent
+    public static void onRegisterEntities(final RegistryEvent.Register<EntityType<?>> event) {
+        ModSpawnEgg.initSpawnEggs();
+    }
+
 }

src/main/java/com/technovision/tutorial/init/ModItems.java

@@ -1,6 +1,7 @@
 package com.technovision.tutorial.init;
 
 import com.technovision.tutorial.Tutorial;
+import com.technovision.tutorial.items.ModSpawnEgg;
 import com.technovision.tutorial.items.PoisonApple;
 import com.technovision.tutorial.util.enums.ModArmorMaterial;
 import com.technovision.tutorial.util.enums.ModItemTier;
@@ -16,8 +17,12 @@ public class ModItems {
 
     // Items
     public static final RegistryObject<Item> RUBY = ITEMS.register("ruby", () -> new Item(new Item.Properties().group(Tutorial.TAB)));
+
     public static final RegistryObject<PoisonApple> POISON_APPLE = ITEMS.register("poison_apple", PoisonApple::new);
 
+    public static final RegistryObject<ModSpawnEgg> HOG_SPAWN_EGG = ITEMS.register("hog_spawn_egg",
+            () -> new ModSpawnEgg(ModEntityType.HOG, 0xE1A68B, 0x99593B, new Item.Properties().group(Tutorial.TAB)));
+
     // Block Items
     public static final RegistryObject<Item> RUBY_BLOCK_ITEM = ITEMS.register("ruby_block",
             () -> new BlockItem(ModBlocks.RUBY_BLOCK.get(), new Item.Properties().group(Tutorial.TAB)));

src/main/java/com/technovision/tutorial/items/ModSpawnEgg.java

@@ -0,0 +1,64 @@
+package com.technovision.tutorial.items;
+
+import net.minecraft.block.DispenserBlock;
+import net.minecraft.dispenser.DefaultDispenseItemBehavior;
+import net.minecraft.dispenser.IBlockSource;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.SpawnReason;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.SpawnEggItem;
+import net.minecraft.nbt.CompoundNBT;
+import net.minecraft.util.Direction;
+import net.minecraftforge.common.util.Lazy;
+import net.minecraftforge.common.util.NonNullSupplier;
+import net.minecraftforge.fml.RegistryObject;
+import net.minecraftforge.fml.common.ObfuscationReflectionHelper;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class ModSpawnEgg extends SpawnEggItem {
+
+    protected static final List<ModSpawnEgg> UNADDED_EGGS = new ArrayList<ModSpawnEgg>();
+    private final Lazy<? extends EntityType<?>> entityTypeSupplier;
+
+    public ModSpawnEgg(final NonNullSupplier<? extends EntityType<?>> entityTypeSupplier, final int primaryColour, final int secondaryColour, final Item.Properties properties) {
+        super(null, primaryColour, secondaryColour, properties);
+        this.entityTypeSupplier = Lazy.of(entityTypeSupplier::get);
+        UNADDED_EGGS.add(this);
+    }
+
+    public ModSpawnEgg(final RegistryObject<? extends EntityType<?>> entityTypeSupplier, final int primaryColour, final int secondaryColour, final Item.Properties properties) {
+        super(null, primaryColour, secondaryColour, properties);
+        this.entityTypeSupplier = Lazy.of(entityTypeSupplier::get);
+        UNADDED_EGGS.add(this);
+    }
+
+    public static void initSpawnEggs() {
+        final Map<EntityType<?>, SpawnEggItem> EGGS = ObfuscationReflectionHelper.getPrivateValue(SpawnEggItem.class, null, "field_195987_b");
+        DefaultDispenseItemBehavior dispenseBehaviour = new DefaultDispenseItemBehavior() {
+            @Override
+            protected ItemStack dispenseStack(IBlockSource source, ItemStack stack) {
+                Direction direction = source.getBlockState().get(DispenserBlock.FACING);
+                EntityType<?> type = ((SpawnEggItem) stack.getItem()).getType(stack.getTag());
+                type.spawn(source.getWorld(), stack, null, source.getBlockPos().offset(direction),
+                        SpawnReason.DISPENSER, direction != Direction.UP, false);
+                stack.shrink(1);
+                return stack;
+            }
+        };
+
+        for (final SpawnEggItem spawnEgg : UNADDED_EGGS) {
+            EGGS.put(spawnEgg.getType(null), spawnEgg);
+            DispenserBlock.registerDispenseBehavior(spawnEgg, dispenseBehaviour);
+        }
+        UNADDED_EGGS.clear();
+    }
+
+    @Override
+    public EntityType<?> getType(CompoundNBT nbt) {
+        return this.entityTypeSupplier.get();
+    }
+}

src/main/resources/assets/tutorial/lang/en_us.json

@@ -14,5 +14,6 @@
   "item.tutorial.ruby_chestplate": "Ruby Chestplate",
   "item.tutorial.ruby_leggings": "Ruby Leggings",
   "item.tutorial.ruby_boots": "Ruby Boots",
+  "item.tutorial.hog_spawn_egg": "Hog Spawn Egg",
   "entity.tutorial.hog": "Hog"
 }

src/main/resources/assets/tutorial/models/item/hog_spawn_egg.json

@@ -0,0 +1,3 @@
+{
+  "parent": "item/template_spawn_egg"
+}