Refactoring: move getRepresentativeUpperBound method to core

Plus prettify it a bit
2019-03-05 12:34:11 +03:00
parent 7c357c0ec0
commit 82c8289666
4 changed files with 19 additions and 21 deletions
@@ -228,3 +228,14 @@ fun UnwrappedType.canHaveUndefinedNullability(): Boolean =
    constructor is NewTypeVariableConstructor ||
            constructor.declarationDescriptor is TypeParameterDescriptor ||
            this is NewCapturedType
+
+val TypeParameterDescriptor.representativeUpperBound: KotlinType
+    get() {
+        assert(upperBounds.isNotEmpty()) { "Upper bounds should not be empty: $this" }
+
+        return upperBounds.firstOrNull {
+            val classDescriptor = it.constructor.declarationDescriptor as? ClassDescriptor ?: return@firstOrNull false
+            classDescriptor.kind != ClassKind.INTERFACE && classDescriptor.kind != ClassKind.ANNOTATION_CLASS
+        } ?: upperBounds.first()
+    }
+