Minor cleanups

src/main/kotlin/org/openrewrite/kotlin/KotlinTypeMapping.kt

@@ -48,6 +48,7 @@ import org.jetbrains.kotlin.fir.types.jvm.FirJavaTypeRef
 import org.jetbrains.kotlin.load.java.structure.*
 import org.jetbrains.kotlin.load.java.structure.impl.classFiles.*
 import org.jetbrains.kotlin.load.kotlin.JvmPackagePartSource
+import org.jetbrains.kotlin.resolve.jvm.JvmClassName
 import org.jetbrains.kotlin.types.ConstantValueKind
 import org.jetbrains.kotlin.types.Variance
 import org.openrewrite.java.JavaTypeMapping
@@ -56,7 +57,6 @@ import org.openrewrite.java.tree.JavaType
 import org.openrewrite.java.tree.JavaType.*
 import org.openrewrite.java.tree.TypeUtils
 import org.openrewrite.kotlin.KotlinTypeSignatureBuilder.Companion.convertClassIdToFqn
-import org.openrewrite.kotlin.KotlinTypeSignatureBuilder.Companion.convertKotlinFqToJavaFq
 import kotlin.collections.ArrayList
 
 @Suppress("DuplicatedCode")
@@ -706,9 +706,9 @@ class KotlinTypeMapping(
                     val source: JvmPackagePartSource? = resolvedSymbol.fir.containerSource as JvmPackagePartSource?
                     if (source != null) {
                         declaringType = if (source.facadeClassName != null) {
-                            createShallowClass(convertKotlinFqToJavaFq(source.facadeClassName.toString()))
+                            createShallowClass((source.facadeClassName as JvmClassName).fqNameForTopLevelClassMaybeWithDollars.asString())
                         } else {
-                            createShallowClass(convertKotlinFqToJavaFq(source.className.toString()))
+                            createShallowClass(source.className.fqNameForTopLevelClassMaybeWithDollars.asString())
                         }
                     }
                 }

src/main/kotlin/org/openrewrite/kotlin/KotlinTypeSignatureBuilder.kt

@@ -40,6 +40,7 @@ import org.jetbrains.kotlin.load.java.structure.impl.classFiles.BinaryJavaTypePa
 import org.jetbrains.kotlin.load.kotlin.JvmPackagePartSource
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.resolve.jvm.JvmClassName
 import org.jetbrains.kotlin.types.Variance
 import org.openrewrite.java.JavaTypeSignatureBuilder
 import org.openrewrite.java.tree.JavaType
@@ -369,9 +370,9 @@ class KotlinTypeSignatureBuilder(private val firSession: FirSession, private val
                     val source: JvmPackagePartSource? = resolvedSymbol.fir.containerSource as JvmPackagePartSource?
                     if (source != null) {
                         declaringSig = if (source.facadeClassName != null) {
-                            convertKotlinFqToJavaFq(source.facadeClassName.toString())
+                            (source.facadeClassName as JvmClassName).fqNameForTopLevelClassMaybeWithDollars.asString()
                         } else {
-                            convertKotlinFqToJavaFq(source.className.toString())
+                            source.className.fqNameForTopLevelClassMaybeWithDollars.asString()
                         }
                     }
                 }
@@ -684,7 +685,7 @@ class KotlinTypeSignatureBuilder(private val firSession: FirSession, private val
                 .replace(".", "$")
                 .replace("/", ".")
                 .replace("?", "")
-            return if (cleanedFqn.startsWith(".")) cleanedFqn.replaceFirst(".".toRegex(), "") else cleanedFqn
+            return if (cleanedFqn.startsWith(".")) cleanedFqn.substring(1) else cleanedFqn
         }
     }
 }

src/test/java/org/openrewrite/kotlin/KotlinTypeMappingTest.java

@@ -40,7 +40,6 @@
 import static java.util.Collections.singletonList;
 import static java.util.Objects.requireNonNull;
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.in;
 import static org.openrewrite.ExecutionContext.REQUIRE_PRINT_EQUALS_INPUT;
 import static org.openrewrite.java.tree.JavaType.GenericTypeVariable.Variance.*;
 import static org.openrewrite.kotlin.Assertions.kotlin;

src/test/java/org/openrewrite/kotlin/tree/MethodReferenceTest.java

@@ -63,7 +63,7 @@ void methodReference() {
     @Test
     void getJavaClass() {
         rewriteRun(
-          kotlin("val a = Integer ::   class  .     java ")
+          kotlin("val a = Int ::   class  .     java ")
         );
     }