feat: Retrieve annotations in super and interface classes

src/main/kotlin/app/revanced/patcher/extensions/AnnotationExtensions.kt

@@ -1,35 +1,61 @@
+@file:Suppress("UNCHECKED_CAST")
+
 package app.revanced.patcher.extensions
 
+import kotlin.reflect.KClass
+
 internal object AnnotationExtensions {
     /**
      * Search for an annotation recursively.
      *
+     * @param targetAnnotationClass The annotation class to search for.
+     * @param searchedClasses A set of annotations that have already been searched.
+     * @return The annotation if found, otherwise null.
+     */
+    fun <T : Annotation> Class<*>.findAnnotationRecursively(
+        targetAnnotationClass: Class<T>,
+        searchedClasses: HashSet<Annotation> = hashSetOf(),
+    ): T? {
+        annotations.forEach { annotation ->
+            // Terminate if the annotation is already searched.
+            if (annotation in searchedClasses) return@forEach
+            searchedClasses.add(annotation)
+
+            // Terminate if the annotation is found.
+            if (targetAnnotationClass == annotation.annotationClass.java) return annotation as T
+
+            return annotation.annotationClass.java.findAnnotationRecursively(
+                targetAnnotationClass,
+                searchedClasses,
+            ) ?: return@forEach
+        }
+
+        // Search the super class.
+        superclass?.findAnnotationRecursively(
+            targetAnnotationClass,
+            searchedClasses,
+        )?.let { return it }
+
+        // Search the interfaces.
+        interfaces.forEach { superClass ->
+            return superClass.findAnnotationRecursively(
+                targetAnnotationClass,
+                searchedClasses,
+            ) ?: return@forEach
+        }
+
+        return null
+    }
+
+    /**
+     * Search for an annotation recursively.
+     *
+     * First the annotations, then the annotated classes super class and then it's interfaces
+     * are searched for the annotation recursively.
+     *
      * @param targetAnnotation The annotation to search for.
      * @return The annotation if found, otherwise null.
      */
-    fun <T : Annotation> Class<*>.findAnnotationRecursively(targetAnnotation: Class<T>): T? {
-        fun <T : Annotation> Class<*>.findAnnotationRecursively(
-            targetAnnotation: Class<T>,
-            searchedAnnotations: HashSet<Annotation>,
-        ): T? {
-            val found = this.annotations.firstOrNull { it.annotationClass.java.name == targetAnnotation.name }
-
-            @Suppress("UNCHECKED_CAST")
-            if (found != null) return found as T
-
-            for (annotation in this.annotations) {
-                if (searchedAnnotations.contains(annotation)) continue
-                searchedAnnotations.add(annotation)
-
-                return annotation.annotationClass.java.findAnnotationRecursively(
-                    targetAnnotation,
-                    searchedAnnotations
-                ) ?: continue
-            }
-
-            return null
-        }
-
-        return this.findAnnotationRecursively(targetAnnotation, hashSetOf())
-    }
+    fun <T : Annotation> KClass<*>.findAnnotationRecursively(targetAnnotation: KClass<T>) =
+        java.findAnnotationRecursively(targetAnnotation.java)
 }

src/main/kotlin/app/revanced/patcher/extensions/MethodFingerprintExtensions.kt

@@ -9,7 +9,7 @@ object MethodFingerprintExtensions {
      */
     @Deprecated(
         message = "Use the property instead.",
-        replaceWith = ReplaceWith("this.fuzzyPatternScanMethod")
+        replaceWith = ReplaceWith("this.fuzzyPatternScanMethod"),
     )
     val MethodFingerprint.fuzzyPatternScanMethod
         get() = this.fuzzyPatternScanMethod

src/main/kotlin/app/revanced/patcher/fingerprint/MethodFingerprint.kt

@@ -48,7 +48,7 @@ abstract class MethodFingerprint(
      *
      *  If the annotation is not present, this property is null.
      */
-    val fuzzyPatternScanMethod = javaClass.findAnnotationRecursively(FuzzyPatternScanMethod::class.java)
+    val fuzzyPatternScanMethod = this::class.findAnnotationRecursively(FuzzyPatternScanMethod::class)
 
     /**
      * Resolve a [MethodFingerprint] using the lookup map built by [initializeLookupMaps].

src/main/kotlin/app/revanced/patcher/patch/Patch.kt

@@ -5,9 +5,10 @@ package app.revanced.patcher.patch
 import app.revanced.patcher.PatchClass
 import app.revanced.patcher.Patcher
 import app.revanced.patcher.data.Context
+import app.revanced.patcher.extensions.AnnotationExtensions.findAnnotationRecursively
 import app.revanced.patcher.patch.options.PatchOptions
 import java.io.Closeable
-import kotlin.reflect.full.findAnnotation
+import app.revanced.patcher.patch.annotation.Patch as PatchAnnotation
 
 /**
  * A ReVanced patch.
@@ -60,7 +61,7 @@ sealed class Patch<out T : Context<*>> {
     val options = PatchOptions()
 
     init {
-        this::class.findAnnotation<app.revanced.patcher.patch.annotation.Patch>()?.let { annotation ->
+        this::class.findAnnotationRecursively(PatchAnnotation::class)?.let { annotation ->
             name = annotation.name.ifEmpty { null }
             description = annotation.description.ifEmpty { null }
             compatiblePackages =

src/test/kotlin/app/revanced/patcher/extensions/AnnotationExtensionsTest.kt

@@ -0,0 +1,50 @@
+package app.revanced.patcher.extensions
+
+import app.revanced.patcher.extensions.AnnotationExtensions.findAnnotationRecursively
+import kotlin.test.Test
+import kotlin.test.assertNotNull
+import kotlin.test.assertNull
+
+private object AnnotationExtensionsTest {
+    @Test
+    fun `find annotation in annotated class`() {
+        assertNotNull(TestClasses.Annotation2::class.findAnnotationRecursively(TestClasses.Annotation::class))
+    }
+
+    @Test
+    fun `find annotation`() {
+        assertNotNull(TestClasses.AnnotatedClass::class.findAnnotationRecursively(TestClasses.Annotation::class))
+    }
+
+    @Test
+    fun `find annotation recursively in super class`() {
+        assertNotNull(TestClasses.AnnotatedClass2::class.findAnnotationRecursively(TestClasses.Annotation::class))
+    }
+
+    @Test
+    fun `find annotation recursively in super class with annotation`() {
+        assertNotNull(TestClasses.AnnotatedTestClass3::class.findAnnotationRecursively(TestClasses.Annotation::class))
+    }
+
+    @Test
+    fun `don't find unknown annotation in annotated class`() {
+        assertNull(TestClasses.AnnotatedClass::class.findAnnotationRecursively(TestClasses.UnknownAnnotation::class))
+    }
+
+    object TestClasses {
+        annotation class Annotation
+
+        @Annotation
+        annotation class Annotation2
+
+        annotation class UnknownAnnotation
+
+        @Annotation
+        abstract class AnnotatedClass
+
+        @Annotation2
+        class AnnotatedTestClass3
+
+        abstract class AnnotatedClass2 : AnnotatedClass()
+    }
+}