New J2K: Stub for JavaField initializer

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

@@ -17,17 +17,24 @@
 package org.jetbrains.kotlin.j2k
 
 import com.intellij.lang.java.JavaLanguage
-import com.intellij.psi.JavaElementVisitor
-import com.intellij.psi.PsiClass
-import com.intellij.psi.PsiElement
-import com.intellij.psi.PsiField
+import com.intellij.psi.*
 import org.jetbrains.kotlin.j2k.tree.JKClass
 import org.jetbrains.kotlin.j2k.tree.JKElement
+import org.jetbrains.kotlin.j2k.tree.JKExpression
 import org.jetbrains.kotlin.j2k.tree.impl.JKClassImpl
+import org.jetbrains.kotlin.j2k.tree.impl.JKElementBase
 import org.jetbrains.kotlin.j2k.tree.impl.JKJavaFieldImpl
 
 class JavaToJKTreeBuilder {
 
+    private class ExpressionTreeVisitor : JavaElementVisitor() {
+        override fun visitElement(element: PsiElement) {
+            element.acceptChildren(this)
+        }
+
+        fun extractExpression(): JKExpression? = object : JKElementBase(), JKExpression {}
+    }
+
     private class ElementVisitor : JavaElementVisitor() {
 
         override fun visitElement(element: PsiElement) {
@@ -42,9 +49,12 @@ class JavaToJKTreeBuilder {
         }
 
         override fun visitField(field: PsiField) {
-            currentClass!!.declarations += JKJavaFieldImpl(field.name!!)
+            val initializer = ExpressionTreeVisitor().also { field.initializer?.accept(it) }.extractExpression()
+
+            currentClass!!.declarations += JKJavaFieldImpl(field.name!!, initializer)
             super.visitField(field)
         }
+
     }
 
     fun buildTree(psi: PsiElement): JKElement? {

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

@@ -16,11 +16,13 @@
 
 package org.jetbrains.kotlin.j2k.tree.impl
 
+import org.jetbrains.kotlin.j2k.tree.JKExpression
 import org.jetbrains.kotlin.j2k.tree.JKJavaField
 import org.jetbrains.kotlin.j2k.tree.JKJavaVisitor
 import org.jetbrains.kotlin.j2k.tree.JKVisitor
 
-class JKJavaFieldImpl(override val name: String) : JKJavaField, JKElementBase() {
+class JKJavaFieldImpl(override val name: String,
+                      override var initializer: JKExpression?) : JKJavaField, JKElementBase() {
 
     override fun <R, D> accept(visitor: JKVisitor<R, D>, data: D): R {
         return if (visitor is JKJavaVisitor) {
@@ -30,4 +32,7 @@ class JKJavaFieldImpl(override val name: String) : JKJavaField, JKElementBase()
             visitor.visitDeclaration(this, data)
         }
     }
+
+    override fun <D> acceptChildren(visitor: JKVisitor<Unit, D>, data: D)
+            = initializer?.accept(visitor, data) ?: Unit
 }

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

@@ -18,6 +18,7 @@ package org.jetbrains.kotlin.j2k.tree
 
 interface JKJavaField : JKDeclaration {
     val name: String
+    var initializer: JKExpression?
 }
 
 interface JKJavaMethod : JKDeclaration