From 03f628aa03a6c35796bf252cc0aaa5e50182d3b1 Mon Sep 17 00:00:00 2001
From: tueem <tueem@tomatentum.net>
Date: Mon, 14 Oct 2024 00:17:34 +0200
Subject: [PATCH] add ReflectionUtil

---
 .../marinara/util/ReflectionUtil.java         | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 lib/src/main/java/net/tomatentum/marinara/util/ReflectionUtil.java

diff --git a/lib/src/main/java/net/tomatentum/marinara/util/ReflectionUtil.java b/lib/src/main/java/net/tomatentum/marinara/util/ReflectionUtil.java
new file mode 100644
index 0000000..10365fe
--- /dev/null
+++ b/lib/src/main/java/net/tomatentum/marinara/util/ReflectionUtil.java
@@ -0,0 +1,39 @@
+package net.tomatentum.marinara.util;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+
+import net.tomatentum.marinara.interaction.commands.annotation.ApplicationCommand;
+import net.tomatentum.marinara.interaction.commands.annotation.SubCommand;
+
+public final class ReflectionUtil {
+
+    public static <T extends Annotation> boolean isAnnotationPresent(Method method, Class<T> annotationClass) {
+        if (method.isAnnotationPresent(annotationClass) || method.getDeclaringClass().isAnnotationPresent(annotationClass))
+            return true;
+
+        return false;
+    }
+
+    public static <T extends Annotation> T getAnnotation(Method method, Class<T> annotationClass) {
+        return method.isAnnotationPresent(annotationClass) ? 
+            method.getAnnotation(annotationClass) : 
+            method.getDeclaringClass().getAnnotation(annotationClass);
+    }
+
+    public static void checkValidCommandMethod(Method method) {
+        if (method.isAnnotationPresent(ApplicationCommand.class) && 
+            method.getDeclaringClass().isAnnotationPresent(ApplicationCommand.class)) {
+            throw new RuntimeException(method.getName() + ": Can't have ApplicationCommand Annotation on Class and Method");
+        }
+
+        if (!isAnnotationPresent(method, ApplicationCommand.class))
+            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Class or Method");
+
+        if (!(method.isAnnotationPresent(SubCommand.class) && 
+            isAnnotationPresent(method, ApplicationCommand.class))) {
+            throw new RuntimeException(method.getName() + ": Missing ApplicationCommand Annotation on either Method or Class");
+        }
+    }
+    
+}