PaperMC/patches/server/0074-Handle-Item-Meta-Inconsistencies.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 28 May 2015 23:00:19 -0400
Subject: [PATCH] Handle Item Meta Inconsistencies

First, Enchantment order would blow away seeing 2 items as the same,
however the Client forces enchantment list in a certain order, as well
as does the /enchant command. Anvils can insert it into forced order,
causing 2 same items to be considered different.

This change makes unhandled NBT Tags and Enchantments use a sorted tree map,
so they will always be in a consistent order.

Additionally, the old enchantment API was never updated when ItemMeta
was added, resulting in 2 different ways to modify an items enchantments.

For consistency, the old API methods now forward to use the
ItemMeta API equivalents, and should deprecate the old API's.

diff --git a/src/main/java/net/minecraft/world/item/enchantment/ItemEnchantments.java b/src/main/java/net/minecraft/world/item/enchantment/ItemEnchantments.java
index b49eb019cce58049c2b3a0e80e3d08998b16f7ea..af18de11dd55938b6091f5ab183bd3fe4e8df152 100644
--- a/src/main/java/net/minecraft/world/item/enchantment/ItemEnchantments.java
+++ b/src/main/java/net/minecraft/world/item/enchantment/ItemEnchantments.java
@@ -27,15 +27,27 @@ import net.minecraft.tags.TagKey;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.TooltipFlag;
 import net.minecraft.world.item.component.TooltipProvider;
+// Paper start
+import it.unimi.dsi.fastutil.objects.Object2IntAVLTreeMap;
+// Paper end
 
 public class ItemEnchantments implements TooltipProvider {
-    public static final ItemEnchantments EMPTY = new ItemEnchantments(new Object2IntOpenHashMap<>(), true);
+    // Paper start
+    private static final java.util.Comparator<Holder<Enchantment>> ENCHANTMENT_ORDER = java.util.Comparator.comparing(Holder::getRegisteredName);
+    public static final ItemEnchantments EMPTY = new ItemEnchantments(new Object2IntAVLTreeMap<>(ENCHANTMENT_ORDER), true);
+    // Paper end
     public static final int MAX_LEVEL = 255;
     private static final Codec<Integer> LEVEL_CODEC = Codec.intRange(0, 255);
-    private static final Codec<Object2IntOpenHashMap<Holder<Enchantment>>> LEVELS_CODEC = Codec.unboundedMap(
+    private static final Codec<Object2IntAVLTreeMap<Holder<Enchantment>>> LEVELS_CODEC = Codec.unboundedMap( // Paper
             BuiltInRegistries.ENCHANTMENT.holderByNameCodec(), LEVEL_CODEC
         )
-        .xmap(Object2IntOpenHashMap::new, Function.identity());
+        // Paper start - sort enchantments
+        .xmap(m -> {
+            final Object2IntAVLTreeMap<Holder<Enchantment>> map = new Object2IntAVLTreeMap<>(ENCHANTMENT_ORDER);
+            map.putAll(m);
+            return map;
+        }, Function.identity());
+        // Paper end - sort enchantments
     private static final Codec<ItemEnchantments> FULL_CODEC = RecordCodecBuilder.create(
         instance -> instance.group(
                     LEVELS_CODEC.fieldOf("levels").forGetter(component -> component.enchantments),
@@ -45,16 +57,16 @@ public class ItemEnchantments implements TooltipProvider {
     );
     public static final Codec<ItemEnchantments> CODEC = Codec.withAlternative(FULL_CODEC, LEVELS_CODEC, map -> new ItemEnchantments(map, true));
     public static final StreamCodec<RegistryFriendlyByteBuf, ItemEnchantments> STREAM_CODEC = StreamCodec.composite(
-        ByteBufCodecs.map(Object2IntOpenHashMap::new, ByteBufCodecs.holderRegistry(Registries.ENCHANTMENT), ByteBufCodecs.VAR_INT),
+        ByteBufCodecs.map((v) -> new Object2IntAVLTreeMap<>(ENCHANTMENT_ORDER), ByteBufCodecs.holderRegistry(Registries.ENCHANTMENT), ByteBufCodecs.VAR_INT), // Paper
         component -> component.enchantments,
         ByteBufCodecs.BOOL,
         component -> component.showInTooltip,
         ItemEnchantments::new
     );
-    final Object2IntOpenHashMap<Holder<Enchantment>> enchantments;
+    final Object2IntAVLTreeMap<Holder<Enchantment>> enchantments; // Paper
     public final boolean showInTooltip;
 
-    ItemEnchantments(Object2IntOpenHashMap<Holder<Enchantment>> enchantments, boolean showInTooltip) {
+    ItemEnchantments(Object2IntAVLTreeMap<Holder<Enchantment>> enchantments, boolean showInTooltip) { // Paper
         this.enchantments = enchantments;
         this.showInTooltip = showInTooltip;
 
@@ -145,7 +157,7 @@ public class ItemEnchantments implements TooltipProvider {
     }
 
     public static class Mutable {
-        private final Object2IntOpenHashMap<Holder<Enchantment>> enchantments = new Object2IntOpenHashMap<>();
+        private final Object2IntAVLTreeMap<Holder<Enchantment>> enchantments = new Object2IntAVLTreeMap<>(ENCHANTMENT_ORDER); // Paper
         public boolean showInTooltip;
 
         public Mutable(ItemEnchantments enchantmentsComponent) {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index b6521462d193bff83ace1dc694c6d957a7173969..d302767e8f01fdfcba9c22e2e35677afc18c0641 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -191,16 +191,11 @@ public final class CraftItemStack extends ItemStack {
     public void addUnsafeEnchantment(Enchantment ench, int level) {
         Preconditions.checkArgument(ench != null, "Enchantment cannot be null");
 
-        if (!CraftItemStack.makeTag(this.handle)) {
-            return;
-        }
-        ItemEnchantments list = CraftItemStack.getEnchantmentList(this.handle);
-        if (list == null) {
-            list = ItemEnchantments.EMPTY;
-        }
-        ItemEnchantments.Mutable listCopy = new ItemEnchantments.Mutable(list);
-        listCopy.set(CraftEnchantment.bukkitToMinecraft(ench), level);
-        this.handle.set(DataComponents.ENCHANTMENTS, listCopy.toImmutable());
+        // Paper start - Replace whole method
+        final ItemMeta itemMeta = this.getItemMeta();
+        itemMeta.addEnchant(ench, level, true);
+        this.setItemMeta(itemMeta);
+        // Paper end
     }
 
     static boolean makeTag(net.minecraft.world.item.ItemStack item) {
@@ -229,24 +224,15 @@ public final class CraftItemStack extends ItemStack {
     public int removeEnchantment(Enchantment ench) {
         Preconditions.checkArgument(ench != null, "Enchantment cannot be null");
 
-        ItemEnchantments list = CraftItemStack.getEnchantmentList(this.handle);
-        if (list == null) {
-            return 0;
-        }
-        int level = this.getEnchantmentLevel(ench);
-        if (level <= 0) {
-            return 0;
-        }
-        int size = list.size();
-
-        if (size == 1) {
-            this.handle.remove(DataComponents.ENCHANTMENTS);
-            return level;
+        // Paper start - replace entire method
+        int level = getEnchantmentLevel(ench);
+        if (level > 0) {
+            final ItemMeta itemMeta = this.getItemMeta();
+            if (itemMeta == null) return 0;
+            itemMeta.removeEnchant(ench);
+            this.setItemMeta(itemMeta);
         }
-
-        ItemEnchantments.Mutable listCopy = new ItemEnchantments.Mutable(list);
-        listCopy.set(CraftEnchantment.bukkitToMinecraft(ench), -1); // Negative to remove
-        this.handle.set(DataComponents.ENCHANTMENTS, listCopy.toImmutable());
+        // Paper end
 
         return level;
     }
@@ -258,7 +244,7 @@ public final class CraftItemStack extends ItemStack {
 
     @Override
     public Map<Enchantment, Integer> getEnchantments() {
-        return CraftItemStack.getEnchantments(this.handle);
+        return this.hasItemMeta() ? this.getItemMeta().getEnchants() : ImmutableMap.<Enchantment, Integer>of(); // Paper - use Item Meta
     }
 
     static Map<Enchantment, Integer> getEnchantments(net.minecraft.world.item.ItemStack item) {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index 9c139f25eaef3c1b93fbf254cb08c6a449288ec8..0c385b713234a74ceba802f67f74e4ecab93e269 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -6,6 +6,7 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableMultimap;
 import com.google.common.collect.LinkedHashMultimap;
+import com.google.common.collect.ImmutableSortedMap; // Paper
 import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.SetMultimap;
@@ -22,6 +23,7 @@ import java.util.Arrays;
 import java.util.Base64;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.Comparator; // Paper
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -32,6 +34,7 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
+import java.util.TreeMap; // Paper
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.annotation.Nonnull;
@@ -221,7 +224,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
     private List<Component> lore; // null and empty are two different states internally
     private Integer customModelData;
     private Map<String, String> blockData;
-    private Map<Enchantment, Integer> enchantments;
+    private EnchantmentMap enchantments; // Paper
     private Multimap<Attribute, AttributeModifier> attributeModifiers;
     private int repairCost;
     private int hideFlag;
@@ -260,7 +263,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         this.blockData = meta.blockData;
 
         if (meta.enchantments != null) {
-            this.enchantments = new LinkedHashMap<Enchantment, Integer>(meta.enchantments);
+            this.enchantments = new EnchantmentMap(meta.enchantments); // Paper
         }
 
         if (meta.hasAttributeModifiers()) {
@@ -391,8 +394,8 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         }
     }
 
-    static Map<Enchantment, Integer> buildEnchantments(ItemEnchantments tag) {
-        Map<Enchantment, Integer> enchantments = new LinkedHashMap<Enchantment, Integer>(tag.size());
+    static EnchantmentMap buildEnchantments(ItemEnchantments tag) { // Paper
+        EnchantmentMap enchantments = new EnchantmentMap(); // Paper
 
         tag.entrySet().forEach((entry) -> {
             Holder<net.minecraft.world.item.enchantment.Enchantment> id = entry.getKey();
@@ -646,13 +649,13 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         return modifiers;
     }
 
-    static Map<Enchantment, Integer> buildEnchantments(Map<String, Object> map, ItemMetaKey key) {
+    static EnchantmentMap buildEnchantments(Map<String, Object> map, ItemMetaKey key) { // Paper
         Map<?, ?> ench = SerializableMeta.getObject(Map.class, map, key.BUKKIT, true);
         if (ench == null) {
             return null;
         }
 
-        Map<Enchantment, Integer> enchantments = new LinkedHashMap<Enchantment, Integer>(ench.size());
+        EnchantmentMap enchantments = new EnchantmentMap(); // Paper
         for (Map.Entry<?, ?> entry : ench.entrySet()) {
             // Doctor older enchants
             String enchantKey = entry.getKey().toString();
@@ -970,14 +973,14 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
 
     @Override
     public Map<Enchantment, Integer> getEnchants() {
-        return this.hasEnchants() ? ImmutableMap.copyOf(this.enchantments) : ImmutableMap.<Enchantment, Integer>of();
+        return this.hasEnchants() ? ImmutableSortedMap.copyOfSorted(this.enchantments) : ImmutableMap.<Enchantment, Integer>of(); // Paper
     }
 
     @Override
     public boolean addEnchant(Enchantment ench, int level, boolean ignoreRestrictions) {
         Preconditions.checkArgument(ench != null, "Enchantment cannot be null");
         if (this.enchantments == null) {
-            this.enchantments = new LinkedHashMap<Enchantment, Integer>(4);
+            this.enchantments = new EnchantmentMap(); // Paper
         }
 
         if (ignoreRestrictions || level >= ench.getStartLevel() && level <= ench.getMaxLevel()) {
@@ -1513,7 +1516,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
             clone.customModelData = this.customModelData;
             clone.blockData = this.blockData;
             if (this.enchantments != null) {
-                clone.enchantments = new LinkedHashMap<Enchantment, Integer>(this.enchantments);
+                clone.enchantments = new EnchantmentMap(this.enchantments); // Paper
             }
             if (this.hasAttributeModifiers()) {
                 clone.attributeModifiers = LinkedHashMultimap.create(this.attributeModifiers);
@@ -1833,4 +1836,22 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
 
         return (result != null) ? result : Optional.empty();
     }
+
+    // Paper start
+    private static class EnchantmentMap extends TreeMap<Enchantment, Integer> {
+        private EnchantmentMap(Map<Enchantment, Integer> enchantments) {
+            this();
+            putAll(enchantments);
+        }
+
+        private EnchantmentMap() {
+            super(Comparator.comparing(o -> o.getKey().toString()));
+        }
+
+        public EnchantmentMap clone() {
+            return (EnchantmentMap) super.clone();
+        }
+    }
+    // Paper end
+
 }