New J2K: Add JetbrainsNullableAnnotationsConverter

j2k/newSrc/org/jetbrains/kotlin/j2k/conversions/JetbrainsNullableAnnotationsConverter.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.j2k.conversions
+
+import org.jetbrains.kotlin.j2k.ConversionContext
+import org.jetbrains.kotlin.j2k.ast.Nullability
+import org.jetbrains.kotlin.j2k.tree.*
+import org.jetbrains.kotlin.j2k.tree.impl.JKTypeElementImpl
+
+
+class JetbrainsNullableAnnotationsConverter(private val context: ConversionContext) : RecursiveApplicableConversionBase() {
+    override fun applyToElement(element: JKTreeElement): JKTreeElement {
+        if (element !is JKAnnotationListOwner) return recurse(element)
+        val nullableAnnotationSymbol =
+            context.symbolProvider.provideByFqName("org.jetbrains.annotations.Nullable")
+        val notNullAnnotationSymbol =
+            context.symbolProvider.provideByFqName("org.jetbrains.annotations.NotNull")
+        val nullableAnnotation =
+            element.annotationList.annotations.firstOrNull { it.classSymbol == nullableAnnotationSymbol }
+        val notNullAnnotation =
+            element.annotationList.annotations.firstOrNull { it.classSymbol == notNullAnnotationSymbol }
+        when (element) {
+            is JKField -> {
+                if (nullableAnnotation != null) {
+                    element.annotationList.annotations -= nullableAnnotation
+                    element.type =
+                            JKTypeElementImpl(element.type.type.updateNullability(Nullability.Nullable))
+                }
+                if (notNullAnnotation != null) {
+                    element.annotationList.annotations -= notNullAnnotation
+                    element.type =
+                            JKTypeElementImpl(element.type.type.updateNullability(Nullability.NotNull))
+                }
+            }
+            is JKMethod -> {
+                if (nullableAnnotation != null) {
+                    element.annotationList.annotations -= nullableAnnotation
+                    element.returnType =
+                            JKTypeElementImpl(element.returnType.type.updateNullability(Nullability.Nullable))
+                }
+                if (notNullAnnotation != null) {
+                    element.annotationList.annotations -= notNullAnnotation
+                    element.returnType =
+                            JKTypeElementImpl(element.returnType.type.updateNullability(Nullability.NotNull))
+                }
+            }
+        }
+        return recurse(element)
+    }
+}