PGMDev · Pablete1234 · Jul 12, 2025 · May 24, 2025 · Jun 25, 2025 · Jul 12, 2025
@@ -0,0 +1,86 @@
+package tc.oc.pgm.platform.sportpaper.inventory;
+
+import java.util.function.Function;
+import net.minecraft.server.v1_8_R3.NBTBase;
+import net.minecraft.server.v1_8_R3.NBTTagByte;
+import net.minecraft.server.v1_8_R3.NBTTagByteArray;
+import net.minecraft.server.v1_8_R3.NBTTagDouble;
+import net.minecraft.server.v1_8_R3.NBTTagFloat;
+import net.minecraft.server.v1_8_R3.NBTTagInt;
+import net.minecraft.server.v1_8_R3.NBTTagIntArray;
+import net.minecraft.server.v1_8_R3.NBTTagLong;
+import net.minecraft.server.v1_8_R3.NBTTagShort;
+import net.minecraft.server.v1_8_R3.NBTTagString;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaItem;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.Nullable;
+import tc.oc.pgm.util.inventory.tag.ItemTag;
+
+/**
+ * An item tag that encodes data in an item meta's "unhandled" tag map, inspired by the modern
+ * persistent data container API
+ */
+public class SpItemTag<T, N extends NBTBase> implements ItemTag<T> {
+  private final String key;
+  private final Codec<T, N> type;
+
+  SpItemTag(String key, Codec<T, N> type) {
+    this.key = "PGM:" + key;
+    this.type = type;
+  }
+
+  @Nullable
+  @Override
+  @SuppressWarnings("unchecked")
+  public T get(ItemStack item) {
+    if (!item.hasItemMeta()) return null;
+    var meta = item.getItemMeta();
+    if (!(meta instanceof CraftMetaItem cbMeta)) return null;
+    var tag = cbMeta.getUnhandledTags().get(key);
+
+    if (tag == null) return null;
+
+    return type.fromNbt.apply((N) tag);
+  }
+
+  @Override
+  public void set(ItemStack item, T value) {
+    var meta = item.hasItemMeta()
+        ? item.getItemMeta()
+        : Bukkit.getItemFactory().getItemMeta(item.getType());
+
+    if (meta instanceof CraftMetaItem cbMeta) {
+      cbMeta.getUnhandledTags().put(key, type.toNbt.apply(value));
+      item.setItemMeta(cbMeta);
+    }
+  }
+
+  @Override
+  public void clear(ItemStack item) {
+    var meta = item.getItemMeta();
+    if (meta instanceof CraftMetaItem cbMeta) {
+      cbMeta.getUnhandledTags().remove(key);
+      item.setItemMeta(cbMeta);
+    }
+  }
+
+  /** Represents a transform between a runtime type and its NBT representation */
+  public record Codec<RT, NBT extends NBTBase>(Function<RT, NBT> toNbt, Function<NBT, RT> fromNbt) {
+    public static Codec<Byte, NBTTagByte> BYTE = new Codec<>(NBTTagByte::new, NBTTagByte::f);
+    public static Codec<Short, NBTTagShort> SHORT = new Codec<>(NBTTagShort::new, NBTTagShort::e);
+    public static Codec<Integer, NBTTagInt> INTEGER = new Codec<>(NBTTagInt::new, NBTTagInt::d);
+    public static Codec<Long, NBTTagLong> LONG = new Codec<>(NBTTagLong::new, NBTTagLong::c);
+    public static Codec<Float, NBTTagFloat> FLOAT = new Codec<>(NBTTagFloat::new, NBTTagFloat::h);
+    public static Codec<Double, NBTTagDouble> DOUBLE =
+        new Codec<>(NBTTagDouble::new, NBTTagDouble::g);
+    public static Codec<byte[], NBTTagByteArray> BYTE_ARRAY =
+        new Codec<>(NBTTagByteArray::new, NBTTagByteArray::c);
+    public static Codec<String, NBTTagString> STRING =
+        new Codec<>(NBTTagString::new, NBTTagString::a_);
+    public static Codec<Boolean, NBTTagByte> BOOLEAN =
+        new Codec<>(b -> new NBTTagByte((byte) (b ? 1 : 0)), byteTag -> byteTag.f() != 0);
+    public static Codec<int[], NBTTagIntArray> INT_ARRAY =
+        new Codec<>(NBTTagIntArray::new, NBTTagIntArray::c);
+  }
+}
@@ -4,15 +4,14 @@
 import tc.oc.pgm.util.platform.Supports;
 
 @Supports(Supports.Variant.SPORTPAPER)
-public class LegacyItemTagFactory implements ItemTag.Factory {
-
+public class SpItemTagFactory implements ItemTag.Factory {
   @Override
   public ItemTag<String> newString(String key) {
-    return new LegacyItemTag();
+    return new SpItemTag<>(key, SpItemTag.Codec.STRING);
   }
 
   @Override
   public ItemTag<Boolean> newBoolean(String key) {
-    return new LegacyBooleanItemTag(newString(key));
+    return new SpItemTag<>(key, SpItemTag.Codec.BOOLEAN);
   }
 }