MissingOverrideAnnotation: Ignore Kotlin sources

Fixes: #234

Author: knutwannheden

src/main/java/org/openrewrite/staticanalysis/MissingOverrideAnnotation.java

@@ -25,6 +25,7 @@
 import org.openrewrite.java.service.AnnotationService;
 import org.openrewrite.java.tree.J;
 import org.openrewrite.java.tree.TypeUtils;
+import org.openrewrite.kotlin.tree.K;
 
 import java.time.Duration;
 import java.util.Collections;
@@ -70,6 +71,12 @@ public TreeVisitor<?, ExecutionContext> getVisitor() {
     private class MissingOverrideAnnotationVisitor extends JavaIsoVisitor<ExecutionContext> {
         private final AnnotationMatcher OVERRIDE_ANNOTATION = new AnnotationMatcher("@java.lang.Override");
 
+        @Override
+        public boolean isAcceptable(SourceFile sourceFile, ExecutionContext ctx) {
+            // Kotlin has a dedicated `override` keyword which is enforced by the compiler
+            return super.isAcceptable(sourceFile, ctx) && !(sourceFile instanceof K.CompilationUnit);
+        }
+
         private Cursor getCursorToParentScope(Cursor cursor) {
             return cursor.dropParentUntil(is -> is instanceof J.NewClass || is instanceof J.ClassDeclaration);
         }