CompatibleHand

Core/src/main/java/com/songoda/core/compatibility/CompatibleHand.java

@@ -0,0 +1,45 @@
+package com.songoda.core.compatibility;
+
+import org.bukkit.inventory.EquipmentSlot;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Get which hand is being used.
+ *
+ * @author Brianna
+ * @since 2020-03-24
+ */
+public enum CompatibleHand {
+
+    MAIN_HAND, OFF_HAND;
+
+    private static Map<String, Method> methodCache = new HashMap<>();
+
+    public static CompatibleHand getHand(Object event) {
+        try {
+            Class<?> clazz = event.getClass();
+            String className = clazz.getName();
+            Method method;
+            if (methodCache.containsKey(className)) {
+                method = methodCache.get(className);
+            } else {
+                method = clazz.getDeclaredMethod("getHand");
+                methodCache.put(className, method);
+            }
+            EquipmentSlot slot = (EquipmentSlot) method.invoke(event);
+            if (slot == EquipmentSlot.OFF_HAND)
+                return OFF_HAND;
+        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+            return MAIN_HAND;
+        }
+        return MAIN_HAND;
+    }
+
+    public static CompatibleHand getHand(EquipmentSlot equipmentSlot) {
+        return equipmentSlot == EquipmentSlot.HAND ? MAIN_HAND : OFF_HAND;
+    }
+}