Add TagHandler#fromCompound

Signed-off-by: TheMode <themode@outlook.fr>

src/main/java/net/minestom/server/tag/TagHandler.java

@@ -1,10 +1,35 @@
 package net.minestom.server.tag;
 
 import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jglrxavpok.hephaistos.nbt.mutable.MutableNBTCompound;
 
 /**
  * Represents an element which can read and write {@link Tag tags}.
  */
 @ApiStatus.Experimental
 public interface TagHandler extends TagReadable, TagWritable {
+
+    /**
+     * Converts a nbt compound to a tag handler.
+     * <p>
+     * The returned tag handler is not thread-safe.
+     *
+     * @param compound the compound to convert
+     * @return a {@link TagHandler} capable of writing and reading {@code compound}
+     */
+    static @NotNull TagHandler fromCompound(@NotNull MutableNBTCompound compound) {
+        return new TagHandler() {
+            @Override
+            public <T> @Nullable T getTag(@NotNull Tag<T> tag) {
+                return tag.read(compound);
+            }
+
+            @Override
+            public <T> void setTag(@NotNull Tag<T> tag, @Nullable T value) {
+                tag.write(compound, value);
+            }
+        };
+    }
 }