SPIGOT-2782: Custom Colors for Potions

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/inventory/meta/PotionMeta.java

@@ -1,5 +1,6 @@
 package org.bukkit.inventory.meta;
 
+import org.bukkit.Color;
 import org.bukkit.potion.PotionEffect;
 import org.bukkit.potion.PotionEffectType;
 import org.bukkit.potion.PotionData;
@@ -89,6 +90,32 @@ public interface PotionMeta extends ItemMeta {
      */
     boolean clearCustomEffects();
 
+    /**
+     * Checks for existence of a potion color.
+     *
+     * @return true if this has a custom potion color
+     */
+    boolean hasColor();
+
+    /**
+     * Gets the potion color that is set. A custom potion color will alter the
+     * display of the potion in an inventory slot.
+     * <p>
+     * Plugins should check that hasColor() returns <code>true</code> before
+     * calling this method.
+     *
+     * @return the potion color that is set
+     */
+    Color getColor();
+
+    /**
+     * Sets the potion color. A custom potion color will alter the display of
+     * the potion in an inventory slot.
+     *
+     * @param color the color to set
+     */
+    void setColor(Color color);
+
     @Override
     PotionMeta clone();
 }