Persist PotionEffect curative items and initialize defaults from Potion (#3573)

src/test/java/net/minecraftforge/debug/PotionCurativeItemDebug.java

@@ -0,0 +1,85 @@
+package net.minecraftforge.debug;
+
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemFood;
+import net.minecraft.item.ItemStack;
+import net.minecraft.potion.Potion;
+import net.minecraft.potion.PotionEffect;
+import net.minecraft.potion.PotionType;
+import net.minecraft.world.World;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.minecraftforge.fml.common.registry.GameRegistry;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Usage (use survival so you can eat food):
+ * 1. Drink curable_potion from Brewing creative tab
+ * 2. Relog to test that changes to curative items persist, then eat the "medicine" item to cure the effect
+ * 3. Drink incurable_potion from Brewing creative tab
+ * 4. Relog to test that changes to curative items persist, then try drinking milk and eating medicine: they should have no effect
+ */
+@Mod(modid = PotionCurativeItemDebug.MOD_ID)
+public class PotionCurativeItemDebug
+{
+    public static final String MOD_ID = "potion_curative_item_debug";
+
+    @Mod.EventHandler
+    public void preInit(FMLPreInitializationEvent evt)
+    {
+        Item medicine = new Medicine().setRegistryName(MOD_ID, "medicine");
+        GameRegistry.register(medicine);
+
+        Potion incurablePotion = new IncurablePotion().setRegistryName(MOD_ID, "incurable_potion");
+        GameRegistry.register(incurablePotion);
+
+        // Register PotionType that can be cured with medicine
+        PotionEffect curable = new PotionEffect(incurablePotion, 1200);
+        curable.setCurativeItems(Collections.singletonList(new ItemStack(medicine)));
+        GameRegistry.register(new PotionType(curable).setRegistryName(MOD_ID, "curable_potion_type"));
+
+        // Register PotionType that can't be cured
+        GameRegistry.register(new PotionType(new PotionEffect(incurablePotion, 1200)).setRegistryName(MOD_ID, "incurable_potion_type"));
+    }
+
+    private static class IncurablePotion extends Potion
+    {
+        protected IncurablePotion()
+        {
+            super(false, 0x94A061);
+            setPotionName("incurable_potion");
+            setIconIndex(6, 0);
+        }
+
+        @Override
+        public List<ItemStack> getCurativeItems()
+        {
+            // By default, no PotionEffect of this Potion can be cured by anything
+            return new ArrayList<ItemStack>();
+        }
+    }
+
+    private static class Medicine extends ItemFood
+    {
+        public Medicine()
+        {
+            super(2, 1, false);
+            setUnlocalizedName("medicine");
+            setAlwaysEdible();
+        }
+
+        @Override
+        protected void onFoodEaten(ItemStack stack, World worldIn, EntityPlayer player)
+        {
+            if (!worldIn.isRemote)
+            {
+                player.curePotionEffects(stack);
+            }
+        }
+    }
+}