Extract VirtualFileBoundJavaClass interface

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/JavaClassImpl.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.load.java.structure.impl
 
 import com.intellij.openapi.diagnostic.Logger
+import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiTypeParameter
 import org.jetbrains.kotlin.asJava.KtLightClassMarker
@@ -26,7 +27,7 @@ import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.KtPsiUtil
 
-class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass), JavaClass, JavaAnnotationOwnerImpl, JavaModifierListOwnerImpl {
+class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass), VirtualFileBoundJavaClass, JavaAnnotationOwnerImpl, JavaModifierListOwnerImpl {
     init {
         assert(psiClass !is PsiTypeParameter) { "PsiTypeParameter should be wrapped in JavaTypeParameter, not JavaClass: use JavaClassifier.create()" }
     }
@@ -109,6 +110,9 @@ class JavaClassImpl(psiClass: PsiClass) : JavaClassifierImpl<PsiClass>(psiClass)
     override val lightClassOriginKind: LightClassOriginKind?
         get() = (psi as? KtLightClassMarker)?.originKind
 
+    override val virtualFile: VirtualFile?
+        get() =  psi.containingFile?.virtualFile
+
     override fun getAnnotationOwnerPsi() = psi.modifierList
 
     private fun assertNotLightClass() {

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/VirtualFileBoundJavaClass.kt

@@ -0,0 +1,24 @@
+/*
+ * 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.load.java.structure.impl
+
+import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.kotlin.load.java.structure.JavaClass
+
+interface VirtualFileBoundJavaClass : JavaClass {
+    val virtualFile: VirtualFile?
+}

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/structure/impl/classFiles/BinaryJavaClass.kt

@@ -21,6 +21,7 @@ import com.intellij.util.containers.ContainerUtil
 import gnu.trove.THashMap
 import org.jetbrains.kotlin.builtins.PrimitiveType
 import org.jetbrains.kotlin.load.java.structure.*
+import org.jetbrains.kotlin.load.java.structure.impl.VirtualFileBoundJavaClass
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.utils.addIfNotNull
@@ -29,14 +30,14 @@ import java.text.CharacterIterator
 import java.text.StringCharacterIterator
 
 class BinaryJavaClass(
-        val virtualFile: VirtualFile,
+        override val virtualFile: VirtualFile,
         override val fqName: FqName,
         private val context: ClassifierResolutionContext,
         private val signatureParser: BinaryClassSignatureParser,
         override var access: Int = 0,
         override val outerClass: JavaClass?,
         classContent: ByteArray? = null
-) : ClassVisitor(ASM_API_VERSION_FOR_CLASS_READING), JavaClass, BinaryJavaModifierListOwner, BinaryJavaAnnotationOwner {
+) : ClassVisitor(ASM_API_VERSION_FOR_CLASS_READING), VirtualFileBoundJavaClass, BinaryJavaModifierListOwner, BinaryJavaAnnotationOwner {
     lateinit var myInternalName: String
 
     override val annotations: MutableCollection<JavaAnnotation> = mutableListOf()

compiler/frontend.java/src/org/jetbrains/kotlin/load/kotlin/VirtualFileFinder.kt

@@ -20,8 +20,7 @@ import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.load.java.structure.JavaClass
-import org.jetbrains.kotlin.load.java.structure.impl.JavaClassImpl
-import org.jetbrains.kotlin.load.java.structure.impl.classFiles.BinaryJavaClass
+import org.jetbrains.kotlin.load.java.structure.impl.VirtualFileBoundJavaClass
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.utils.sure
 
@@ -34,10 +33,8 @@ abstract class VirtualFileFinder : KotlinClassFinder {
     }
 
     override fun findKotlinClass(javaClass: JavaClass): KotlinJvmBinaryClass? {
-        var file =
-                (javaClass as? JavaClassImpl)?.psi?.containingFile?.virtualFile
-                ?: (javaClass as? BinaryJavaClass)?.virtualFile
-                ?: return null
+        var file = (javaClass as? VirtualFileBoundJavaClass)?.virtualFile ?: return null
+
         if (javaClass.outerClass != null) {
             // For nested classes we get a file of the containing class, to get the actual class file for A.B.C,
             // we take the file for A, take its parent directory, then in this directory we look for A$B$C.class