SPIGOT-6527: Add AxolotlBucketMeta

src/main/java/org/bukkit/inventory/meta/AxolotlBucketMeta.java

@@ -0,0 +1,39 @@
+package org.bukkit.inventory.meta;
+
+import org.bukkit.entity.Axolotl;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Represents a bucket of axolotl.
+ */
+public interface AxolotlBucketMeta extends ItemMeta {
+
+    /**
+     * Get the variant of the axolotl in the bucket.
+     * <p>
+     * Plugins should check that hasVariant() returns <code>true</code> before
+     * calling this method.
+     * @return axolotl variant
+     */
+    @NotNull
+    Axolotl.Variant getVariant();
+
+    /**
+     * Set the variant of this axolotl in the bucket.
+     *
+     * @param variant axolotl variant
+     */
+    void setVariant(@NotNull Axolotl.Variant variant);
+
+    /**
+     * Checks for existence of a variant tag indicating a specific axolotl will be
+     * spawned.
+     *
+     * @return if there is a variant
+     */
+    boolean hasVariant();
+
+    @Override
+    @NotNull
+    AxolotlBucketMeta clone();
+}