J2K: replaced IntermediateResult with function

j2k/src/org/jetbrains/jet/j2k/Converter.kt

@@ -74,20 +74,14 @@ class Converter private(private val elementToConvert: PsiElement,
 
     private fun createDefaultCodeConverter() = CodeConverter(this, DefaultExpressionConverter(), DefaultStatementConverter(), null)
 
-    public trait IntermediateResult {
-        fun finishConversion(usageProcessings: Map<PsiElement, UsageProcessing>): String
-    }
-
-    public fun convert(): IntermediateResult? {
+    public fun convert(): ((Map<PsiElement, UsageProcessing>) -> String)? {
         val element = convertTopElement(elementToConvert) ?: return null
-        return object: IntermediateResult {
-            override fun finishConversion(usageProcessings: Map<PsiElement, UsageProcessing>): String {
-                unfoldDeferredElements(usageProcessings)
+        return { usageProcessings ->
+            unfoldDeferredElements(usageProcessings)
 
-                val builder = CodeBuilder(elementToConvert)
-                builder.append(element)
-                return builder.result
-            }
+            val builder = CodeBuilder(elementToConvert)
+            builder.append(element)
+            builder.result
         }
     }
 

j2k/src/org/jetbrains/jet/j2k/JavaToKotlinConverter.kt

@@ -53,7 +53,7 @@ public class JavaToKotlinConverter(private val project: Project,
 
     public fun elementsToKotlin(psiElementsAndProcessors: List<Pair<PsiElement, PostProcessor?>>): List<String> {
         try {
-            val intermediateResults = ArrayList<Converter.IntermediateResult?>(psiElementsAndProcessors.size)
+            val intermediateResults = ArrayList<((Map<PsiElement, UsageProcessing>) -> String)?>(psiElementsAndProcessors.size)
             val usageProcessings = HashMap<PsiElement, UsageProcessing>()
             val usageProcessingCollector: (UsageProcessing) -> Unit = { usageProcessing ->
                 assert(!usageProcessings.containsKey(usageProcessing.targetElement))
@@ -68,7 +68,7 @@ public class JavaToKotlinConverter(private val project: Project,
 
             val results = ArrayList<String>(psiElementsAndProcessors.size)
             for ((i, result) in intermediateResults.withIndices()) {
-                results.add(result?.finishConversion(usageProcessings) ?: "")
+                results.add(if (result != null) result(usageProcessings) else "")
                 intermediateResults[i] = null // to not hold unused objects in the heap
             }