New J2K: Add conversion which will initialize java implicit initialized fields

j2k/newSrc/org/jetbrains/kotlin/j2k/ConversionsRunner.kt

@@ -23,6 +23,7 @@ object ConversionsRunner {
 
     private fun createConversions(context: ConversionContext) = listOf(
         ModalityConversion(context),
+        ImplicitInitializerConversion(),
         TypeMappingConversion(context),
         FieldToPropertyConversion(),
         AssignmentAsExpressionToAlsoConversion(context),
@@ -33,7 +34,7 @@ object ConversionsRunner {
         JavaMethodToKotlinFunctionConversion(),
         LiteralConversion(),
         InnerClassConversion(),
-        ModifiersConversion(),
+        ModifiersConversion(context),
         PolyadicExpressionConversion(),
         BinaryExpressionConversion()
     )

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

@@ -0,0 +1,23 @@
+/*
+ * 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.tree.*
+import org.jetbrains.kotlin.j2k.tree.impl.JKNullLiteral
+import org.jetbrains.kotlin.j2k.tree.impl.JKUnresolvedClassType
+
+class ImplicitInitializerConversion : RecursiveApplicableConversionBase() {
+    override fun applyToElement(element: JKTreeElement): JKTreeElement {
+        if (element !is JKJavaField) return recurse(element)
+
+        if (element.initializer !is JKStubExpression) return recurse(element)
+
+        if (element.type.type is JKClassType || element.type.type is JKUnresolvedClassType) element.initializer = JKNullLiteral()
+
+        return element
+    }
+
+}

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/jk.kt

@@ -79,7 +79,7 @@ class JKParameterImpl(
     override fun <R, D> accept(visitor: JKVisitor<R, D>, data: D): R = visitor.visitParameter(this, data)
 
     override var modifierList by child(modifierList)
-    override val initializer by child(initializer)
+    override var initializer by child(initializer)
     override val name by child(name)
     override var type by child(type)
 }
@@ -203,7 +203,7 @@ class JKBooleanLiteral(val value: Boolean) : JKLiteralExpression, JKElementBase(
 class JKLocalVariableImpl(modifierList: JKModifierList, type: JKTypeElement, name: JKNameIdentifier, initializer: JKExpression) :
     JKLocalVariable, JKBranchElementBase() {
     override var modifierList by child(modifierList)
-    override val initializer by child(initializer)
+    override var initializer by child(initializer)
     override val name by child(name)
     override val type by child(type)
 

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/impl/k.kt

@@ -36,7 +36,7 @@ class JKKtPropertyImpl(
     override var modifierList: JKModifierList by child(modifierList)
     override var type by child(type)
     override var name: JKNameIdentifier by child(name)
-    override val initializer: JKExpression by child(initializer)
+    override var initializer: JKExpression by child(initializer)
     override val getter: JKBlock by child(getter)
     override val setter: JKBlock by child(setter)
 }

j2k/newSrc/org/jetbrains/kotlin/j2k/tree/jk.kt

@@ -63,7 +63,7 @@ interface JKMethod : JKDeclaration, JKModifierListOwner {
 interface JKField : JKDeclaration, JKModifierListOwner {
     val type: JKTypeElement
     val name: JKNameIdentifier
-    val initializer: JKExpression
+    var initializer: JKExpression
 }
 
 interface JKLocalVariable : JKField