New J2K: Add stub for JKTree builder

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

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.j2k
+
+import com.intellij.lang.java.JavaLanguage
+import com.intellij.psi.JavaElementVisitor
+import com.intellij.psi.PsiElement
+
+class JavaToJKTreeBuilder {
+
+    private class ElementVisitor : JavaElementVisitor()
+
+    fun buildTree(psi: PsiElement): Nothing {
+        assert(psi.language.`is`(JavaLanguage.INSTANCE)) { "Unable to build JK Tree using Java Visitor for language ${psi.language}" }
+        val elementVisitor = ElementVisitor()
+        psi.accept(elementVisitor)
+        TODO("Tree output type")
+    }
+}

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

@@ -28,6 +28,9 @@ class NewJavaToKotlinConverter(
 ) {
 
     fun filesToKotlin(files: List<PsiJavaFile>, progressIndicator: ProgressIndicator = EmptyProgressIndicator()): Nothing {
+        val treeBuilder = JavaToJKTreeBuilder()
+        val fileTrees = files.map(treeBuilder::buildTree)
+
         TODO("Output generation")
     }
 }