#1397: Add ItemMeta#getAsComponentString()

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java

@@ -10,6 +10,7 @@ import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
 import com.google.common.collect.SetMultimap;
 import com.google.common.collect.Sets;
+import com.mojang.serialization.DynamicOps;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -29,23 +30,29 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
+import java.util.StringJoiner;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import net.minecraft.core.Holder;
+import net.minecraft.core.IRegistry;
+import net.minecraft.core.IRegistryCustom;
 import net.minecraft.core.component.DataComponentPatch;
 import net.minecraft.core.component.DataComponentType;
 import net.minecraft.core.component.DataComponents;
+import net.minecraft.core.registries.Registries;
 import net.minecraft.nbt.DynamicOpsNBT;
 import net.minecraft.nbt.NBTBase;
 import net.minecraft.nbt.NBTCompressedStreamTools;
 import net.minecraft.nbt.NBTReadLimiter;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
+import net.minecraft.nbt.SnbtPrinterTagVisitor;
 import net.minecraft.network.chat.IChatBaseComponent;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.Unit;
@@ -62,12 +69,15 @@ import net.minecraft.world.item.component.ItemLore;
 import net.minecraft.world.item.component.Unbreakable;
 import net.minecraft.world.item.enchantment.ItemEnchantments;
 import net.minecraft.world.level.block.state.IBlockData;
+import org.bukkit.Bukkit;
 import org.bukkit.Material;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeModifier;
 import org.bukkit.block.data.BlockData;
 import org.bukkit.configuration.serialization.DelegateDeserialization;
 import org.bukkit.craftbukkit.CraftEquipmentSlot;
+import org.bukkit.craftbukkit.CraftRegistry;
+import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.Overridden;
 import org.bukkit.craftbukkit.attribute.CraftAttribute;
 import org.bukkit.craftbukkit.attribute.CraftAttributeInstance;
@@ -1283,6 +1293,34 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         return nbt.toString();
     }
 
+    @Override
+    public String getAsComponentString() {
+        CraftMetaItem.Applicator tag = new CraftMetaItem.Applicator();
+        applyToItem(tag);
+        DataComponentPatch patch = tag.build();
+
+        IRegistryCustom registryAccess = CraftRegistry.getMinecraftRegistry();
+        DynamicOps<NBTBase> ops = registryAccess.createSerializationContext(DynamicOpsNBT.INSTANCE);
+        IRegistry<DataComponentType<?>> componentTypeRegistry = registryAccess.registryOrThrow(Registries.DATA_COMPONENT_TYPE);
+
+        StringJoiner componentString = new StringJoiner(",", "[", "]");
+        for (Entry<DataComponentType<?>, Optional<?>> entry : patch.entrySet()) {
+            DataComponentType<?> componentType = entry.getKey();
+            Optional<?> componentValue = entry.getValue();
+            String componentKey = componentTypeRegistry.getResourceKey(componentType).orElseThrow().location().toString();
+
+            if (componentValue.isPresent()) {
+                NBTBase componentValueAsNBT = (NBTBase) ((DataComponentType) componentType).codecOrThrow().encodeStart(ops, componentValue.get()).getOrThrow();
+                String componentValueAsNBTString = new SnbtPrinterTagVisitor("", 0, new ArrayList<>()).visit(componentValueAsNBT);
+                componentString.add(componentKey + "=" + componentValueAsNBTString);
+            } else {
+                // TODO: 1.21, remove component (!) format
+            }
+        }
+
+        return componentString.toString();
+    }
+
     @Override
     public CustomItemTagContainer getCustomTagContainer() {
         return new DeprecatedCustomTagContainer(this.getPersistentDataContainer());