Extract abstract FileBasedKotlinClass out of VirtualFileKotlinClass

Add another implementation of FileBasedKotlinClass which was indirectly used in
jps-plugin (LocalFileKotlinClass)

Original commit: fa39bf03a0

jps/jps-plugin/src/org/jetbrains/jet/jps/incremental/IncrementalCacheImpl.kt

@@ -24,10 +24,8 @@ import com.intellij.util.io.IOUtil
 import java.io.DataInput
 import org.jetbrains.jet.lang.resolve.name.FqName
 import com.intellij.util.io.DataExternalizer
-import org.jetbrains.jet.lang.resolve.kotlin.VirtualFileKotlinClass
 import org.jetbrains.jet.lang.resolve.kotlin.header.KotlinClassHeader
 import org.jetbrains.jet.descriptors.serialization.BitEncoding
-import org.jetbrains.jet.utils.intellij.*
 import java.util.Arrays
 import org.jetbrains.org.objectweb.asm.*
 import com.intellij.util.io.EnumeratorStringDescriptor
@@ -37,7 +35,6 @@ import java.util.HashSet
 import org.jetbrains.jet.lang.resolve.kotlin.incremental.cache.IncrementalCache
 import java.util.HashMap
 import org.jetbrains.jet.lang.resolve.java.PackageClassUtils
-import com.intellij.util.containers.MultiMap
 import com.intellij.openapi.util.io.FileUtil
 import java.security.MessageDigest
 import org.jetbrains.jps.incremental.storage.StorageOwner
@@ -62,11 +59,13 @@ public class IncrementalCacheImpl(val baseDir: File): StorageOwner, IncrementalC
     private val maps = listOf(protoMap, constantsMap, inlineFunctionsMap, packagePartMap)
 
     public fun saveFileToCache(sourceFiles: Collection<File>, classFile: File): RecompilationDecision {
-        val fileBytes = classFile.readBytes()
-        val classNameAndHeader = VirtualFileKotlinClass.readClassNameAndHeader(fileBytes)
-        if (classNameAndHeader == null) return DO_NOTHING
+        val kotlinClass = LocalFileKotlinClass.create(classFile)
+        if (kotlinClass == null) return DO_NOTHING
+
+        val fileBytes = kotlinClass.getFileContents()
+        val className = kotlinClass.getClassName()
+        val header = kotlinClass.getClassHeader()
 
-        val (className, header) = classNameAndHeader
         val annotationDataEncoded = header.annotationData
         if (annotationDataEncoded != null) {
             val data = BitEncoding.decodeBytes(annotationDataEncoded)

jps/jps-plugin/src/org/jetbrains/jet/jps/incremental/LocalFileKotlinClass.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2010-2014 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.jet.jps.incremental
+
+import org.jetbrains.jet.lang.resolve.kotlin.FileBasedKotlinClass
+import org.jetbrains.jet.lang.resolve.java.JvmClassName
+import org.jetbrains.jet.lang.resolve.kotlin.header.KotlinClassHeader
+import java.io.File
+
+class LocalFileKotlinClass private(
+        private val file: File,
+        private val fileContents: ByteArray,
+        className: JvmClassName,
+        classHeader: KotlinClassHeader
+) : FileBasedKotlinClass(className, classHeader) {
+
+    class object {
+        fun create(file: File): LocalFileKotlinClass? {
+            val fileContents = file.readBytes()
+            val nameAndHeader = FileBasedKotlinClass.readClassNameAndHeader(fileContents)
+            if (nameAndHeader == null) return null
+
+            return LocalFileKotlinClass(file, fileContents, nameAndHeader.first!!, nameAndHeader.second!!)
+        }
+    }
+
+    public override fun getFileContents(): ByteArray = fileContents
+
+    override fun hashCode(): Int = file.hashCode()
+    override fun equals(other: Any?): Boolean = other is LocalFileKotlinClass && file == other.file
+    override fun toString(): String = "$javaClass: $file"
+}

jps/jps-plugin/test/org/jetbrains/jet/jps/build/classFilesComparison.kt

@@ -35,7 +35,7 @@ import com.google.protobuf.ExtensionRegistry
 import java.io.ByteArrayInputStream
 import org.jetbrains.jet.descriptors.serialization.DebugProtoBuf
 import java.util.Arrays
-import org.jetbrains.jet.lang.resolve.kotlin.VirtualFileKotlinClass
+import org.jetbrains.jet.jps.incremental.LocalFileKotlinClass
 
 // Set this to true if you want to dump all bytecode (test will fail in this case)
 val DUMP_ALL = System.getProperty("comparison.dump.all") == "true"
@@ -116,12 +116,10 @@ fun assertEqualDirectories(expected: File, actual: File) {
 fun classFileToString(classFile: File): String {
     val out = StringWriter()
 
-    val classBytes = classFile.readBytes()
-
     val traceVisitor = TraceClassVisitor(PrintWriter(out))
-    ClassReader(classBytes).accept(traceVisitor, 0)
+    ClassReader(classFile.readBytes()).accept(traceVisitor, 0)
 
-    val classHeader = VirtualFileKotlinClass.readClassHeader(classBytes)
+    val classHeader = LocalFileKotlinClass.create(classFile)?.getClassHeader()
 
     val annotationDataEncoded = classHeader?.annotationData
     if (annotationDataEncoded != null) {