Limit DanglingDocCommentToBlockComment to Java sources

src/main/java/org/openrewrite/java/migrate/DanglingDocCommentToBlockComment.java

@@ -17,13 +17,15 @@
 
 import lombok.Getter;
 import org.openrewrite.ExecutionContext;
+import org.openrewrite.Preconditions;
 import org.openrewrite.Recipe;
 import org.openrewrite.TreeVisitor;
 import org.openrewrite.internal.ListUtils;
 import org.openrewrite.java.JavaIsoVisitor;
 import org.openrewrite.java.tree.Comment;
 import org.openrewrite.java.tree.Space;
 import org.openrewrite.java.tree.TextComment;
+import org.openrewrite.staticanalysis.java.JavaFileChecker;
 
 public class DanglingDocCommentToBlockComment extends Recipe {
 
@@ -38,7 +40,9 @@ public class DanglingDocCommentToBlockComment extends Recipe {
 
     @Override
     public TreeVisitor<?, ExecutionContext> getVisitor() {
-        return new JavaIsoVisitor<ExecutionContext>() {
+        // Kotlin, Groovy and JavaScript parse every comment, KDoc and JSDoc included, to a TextComment,
+        // so they would all look dangling. The javac lint only concerns Java sources anyway.
+        return Preconditions.check(new JavaFileChecker<>(), new JavaIsoVisitor<ExecutionContext>() {
             @Override
             public Space visitSpace(Space space, Space.Location loc, ExecutionContext ctx) {
                 // A leading comment is conventionally the license header, and javac does not flag it.
@@ -47,7 +51,7 @@ public Space visitSpace(Space space, Space.Location loc, ExecutionContext ctx) {
                 }
                 return space.withComments(ListUtils.map(space.getComments(), DanglingDocCommentToBlockComment::toBlockComment));
             }
-        };
+        });
     }
 
     /**

src/test/java/org/openrewrite/java/migrate/DanglingDocCommentToBlockCommentTest.java

@@ -20,7 +20,9 @@
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
 
+import static org.openrewrite.groovy.Assertions.groovy;
 import static org.openrewrite.java.Assertions.java;
+import static org.openrewrite.kotlin.Assertions.kotlin;
 
 class DanglingDocCommentToBlockCommentTest implements RewriteTest {
 
@@ -199,4 +201,36 @@ void a() {
           )
         );
     }
+
+    @Test
+    void leaveKotlinAlone() {
+        rewriteRun(
+          kotlin(
+            """
+              import java.util.UUID
+
+              /*******************************************************************
+               * KDoc is parsed as a plain comment, so it would otherwise look dangling.
+               */
+              val id = UUID.randomUUID()
+              """
+          )
+        );
+    }
+
+    @Test
+    void leaveGroovyAlone() {
+        rewriteRun(
+          groovy(
+            """
+              import java.util.UUID
+
+              /*******************************************************************
+               * Groovydoc is parsed as a plain comment, so it would otherwise look dangling.
+               */
+              def id = UUID.randomUUID()
+              """
+          )
+        );
+    }
 }