Minor, rename and invert meaning of ClassId.isTopLevelClass

Also use a simpler constructor and simplify ClassDeserializer.ClassKey

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.java

@@ -20,7 +20,6 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.name.ClassId;
 import org.jetbrains.kotlin.name.FqName;
-import org.jetbrains.kotlin.name.FqNameUnsafe;
 import org.jetbrains.kotlin.name.Name;
 import org.jetbrains.kotlin.resolve.jvm.JvmClassName;
 
@@ -47,7 +46,7 @@ public final class JvmAnnotationNames {
     public static class KotlinSyntheticClass {
         public static final JvmClassName CLASS_NAME = JvmClassName.byInternalName("kotlin/jvm/internal/KotlinSyntheticClass");
         public static final ClassId KIND_CLASS_ID =
-                new ClassId(new FqName("kotlin.jvm.internal"), new FqNameUnsafe("KotlinSyntheticClass.Kind"));
+                ClassId.topLevel(CLASS_NAME.getFqNameForClassNameWithoutDollars()).createNestedClassId(Name.identifier("Kind"));
         public static final String KIND_INTERNAL_NAME = JvmClassName.byClassId(KIND_CLASS_ID).getInternalName();
 
         public static final Name KIND_FIELD_NAME = Name.identifier("kind");

core/descriptors/src/org/jetbrains/kotlin/name/ClassId.java

@@ -57,8 +57,8 @@ public final class ClassId {
         return new ClassId(getPackageFqName(), relativeClassName.parent());
     }
 
-    public boolean isTopLevelClass() {
+    public boolean isNestedClass() {
-        return relativeClassName.parent().isRoot();
+        return !relativeClassName.parent().isRoot();
     }
 
     @NotNull

core/descriptors/src/org/jetbrains/kotlin/types/flexibleTypes.kt

@@ -21,8 +21,6 @@ import org.jetbrains.kotlin.types.Approximation.DataFlowExtras
 import org.jetbrains.kotlin.name.FqName
 import kotlin.platform.platformStatic
 import org.jetbrains.kotlin.name.ClassId
-import org.jetbrains.kotlin.name.FqNameUnsafe
-import org.jetbrains.kotlin.name.Name
 
 public trait FlexibleTypeCapabilities {
     fun <T: TypeCapability> getCapability(capabilityClass: Class<T>, jetType: JetType, flexibility: Flexibility): T?
@@ -40,7 +38,7 @@ public trait Flexibility : TypeCapability, SubtypingRepresentatives {
         // it creates a flexible type, e.g. (Foo..Foo?).
         // This is used in tests and Evaluate Expression to have flexible types in the code,
         // but normal users should not be referencing this classifier
-        public val FLEXIBLE_TYPE_CLASSIFIER: ClassId = ClassId(FqName("kotlin.internal.flexible"), FqNameUnsafe.topLevel(Name.identifier("ft")))
+        public val FLEXIBLE_TYPE_CLASSIFIER: ClassId = ClassId.topLevel(FqName("kotlin.internal.flexible.ft"))
     }
 
     // lowerBound is a subtype of upperBound

core/serialization/src/org/jetbrains/kotlin/serialization/deserialization/ClassDeserializer.kt

@@ -31,21 +31,20 @@ public class ClassDeserializer(private val components: DeserializationComponents
     private fun createClass(key: ClassKey): DeserializedClassDescriptor? {
         val classId = key.classId
         val classData = key.classData ?: components.classDataFinder.findClassData(classId) ?: return null
-        val outerContext = if (classId.isTopLevelClass()) {
+        val outerContext = if (classId.isNestedClass()) {
+            deserializeClass(classId.getOuterClassId())?.c ?: return null
+        }
+        else {
             val fragments = components.packageFragmentProvider.getPackageFragments(classId.getPackageFqName())
             assert(fragments.size() == 1) { "There should be exactly one package: $fragments, class id is $classId" }
             components.createContext(fragments.single(), classData.getNameResolver())
         }
-        else {
-            deserializeClass(classId.getOuterClassId())?.c ?: return null
-        }
 
         return DeserializedClassDescriptor(outerContext, classData.getClassProto(), classData.getNameResolver())
     }
 
-    private inner class ClassKey(val classId: ClassId, val classData: ClassData?) {
+    private data class ClassKey(val classId: ClassId, classData: ClassData?) {
-        override fun equals(other: Any?): Boolean = other is ClassKey && classId == other.classId
+        // This property is not declared in the constructor because it shouldn't participate in equals/hashCode
-        override fun hashCode(): Int = classId.hashCode()
+        val classData: ClassData? = classData
-        override fun toString(): String = classId.toString()
     }
 }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/stubBuilder/ClassClsStubBuilder.kt

@@ -111,7 +111,7 @@ private class ClassClsStubBuilder(
             ProtoBuf.Class.Kind.OBJECT, ProtoBuf.Class.Kind.CLASS_OBJECT -> {
                 KotlinObjectStubImpl(
                         parentStub, shortName, fqName, superTypeRefs,
-                        isTopLevel = classId.isTopLevelClass(),
+                        isTopLevel = !classId.isNestedClass(),
                         isClassObject = isClassObject,
                         isLocal = false,
                         isObjectLiteral = false
@@ -127,7 +127,7 @@ private class ClassClsStubBuilder(
                         isTrait = classKind == ProtoBuf.Class.Kind.TRAIT,
                         isEnumEntry = classKind == ProtoBuf.Class.Kind.ENUM_ENTRY,
                         isLocal = false,
-                        isTopLevel = classId.isTopLevelClass()
+                        isTopLevel = !classId.isNestedClass()
                 )
             }
         }