From a342f844b8602a3c4db76daa820690f6040a868f Mon Sep 17 00:00:00 2001
From: Kerooker <leonardo.colman98@gmail.com>
Date: Wed, 26 Dec 2018 18:24:10 -0200
Subject: [PATCH] Implements `KAnnotatedElement.hasAnnotation()`

This commit fixes KT-29041, by adding a convenience method to verify if a certain `KAnnotatedElement` has an annotation or not
---
 .../reflection/annotations/hasAnnotation.kt   | 25 +++++++++++++++++++
 .../kotlin/reflect/full/KAnnotatedElements.kt |  7 ++++++
 2 files changed, 32 insertions(+)
 create mode 100644 compiler/testData/codegen/box/reflection/annotations/hasAnnotation.kt

diff --git a/compiler/testData/codegen/box/reflection/annotations/hasAnnotation.kt b/compiler/testData/codegen/box/reflection/annotations/hasAnnotation.kt
new file mode 100644
index 00000000000..c46cf570849
--- /dev/null
+++ b/compiler/testData/codegen/box/reflection/annotations/hasAnnotation.kt
@@ -0,0 +1,25 @@
+// TARGET_BACKEND: JVM
+// WITH_REFLECT
+
+import kotlin.reflect.full.hasAnnotation
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+annotation class Baz
+annotation class Far
+
+@Baz
+@Far
+class Foo
+
+class Bar
+
+fun box(): String {
+    assertFalse(Bar::class.hasAnnotation<Baz>())
+    assertFalse(Bar::class.hasAnnotation<Far>())
+
+    assertTrue(Foo::class.hasAnnotation<Baz>())
+    assertTrue(Foo::class.hasAnnotation<Far>())
+
+    return "OK"
+}
diff --git a/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt b/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
index 2b869b7c66f..5e16e718b73 100644
--- a/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
@@ -26,3 +26,10 @@ import kotlin.reflect.*
 inline fun <reified T : Annotation> KAnnotatedElement.findAnnotation(): T? =
         @Suppress("UNCHECKED_CAST")
         annotations.firstOrNull { it is T } as T?
+
+/**
+ * Returns true if this element is annotated with [T], false otherwise
+ */
+@SinceKotlin("1.4")
+inline fun <reified T : Annotation> KAnnotatedElement.hasAnnotation(): Boolean =
+        findAnnotation<T>() != null
\ No newline at end of file