Allow multiple ClassDescriptorFactory instances in deserialization

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

@@ -25,10 +25,4 @@ interface ClassDescriptorFactory {
     fun shouldCreateClass(packageFqName: FqName, name: Name): Boolean
 
     fun createClass(classId: ClassId): ClassDescriptor?
-
-    object EMPTY : ClassDescriptorFactory {
-        override fun shouldCreateClass(packageFqName: FqName, name: Name): Boolean = false
-
-        override fun createClass(classId: ClassId): ClassDescriptor? = null
-    }
 }

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

@@ -32,7 +32,9 @@ class ClassDeserializer(private val components: DeserializationComponents) {
 
     private fun createClass(key: ClassKey): ClassDescriptor? {
         val classId = key.classId
-        components.fictitiousClassDescriptorFactory.createClass(classId)?.let { return it }
+        for (factory in components.fictitiousClassDescriptorFactories) {
+            factory.createClass(classId)?.let { return it }
+        }
         val (classData, sourceElement) = key.classDataWithSource
                                          ?: components.classDataFinder.findClassData(classId)
                                          ?: return null

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

@@ -36,7 +36,7 @@ class DeserializationComponents(
         val errorReporter: ErrorReporter,
         val lookupTracker: LookupTracker,
         val flexibleTypeDeserializer: FlexibleTypeDeserializer,
-        val fictitiousClassDescriptorFactory: ClassDescriptorFactory,
+        val fictitiousClassDescriptorFactories: Iterable<ClassDescriptorFactory>,
         val notFoundClasses: NotFoundClasses,
         val additionalClassPartsProvider: AdditionalClassPartsProvider = AdditionalClassPartsProvider.None,
         val platformDependentDeclarationFilter: PlatformDependentDeclarationFilter = PlatformDependentDeclarationFilter.All

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedPackageMemberScope.kt

@@ -45,7 +45,7 @@ open class DeserializedPackageMemberScope(
             = computeDescriptors(kindFilter, nameFilter, NoLookupLocation.WHEN_GET_ALL_DESCRIPTORS)
 
     override fun hasClass(name: Name) =
-            super.hasClass(name) || c.components.fictitiousClassDescriptorFactory.shouldCreateClass(packageFqName, name)
+            super.hasClass(name) || c.components.fictitiousClassDescriptorFactories.any { it.shouldCreateClass(packageFqName, name) }
 
     override fun createClassId(name: Name) = ClassId(packageFqName, name)