[Refactor] to rename and re-layer the file_util stack layers.

webkit/fileapi/fileapi_file_util.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
-#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
+#ifndef WEBKIT_FILEAPI_FILE_UTIL_H_
+#define WEBKIT_FILEAPI_FILE_UTIL_H_
 
-#include "base/callback.h"
 #include "base/file_path.h"
-#include "base/file_util.h"
 #include "base/file_util_proxy.h"
-#include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
-#include "base/tracked_objects.h"
-#include "webkit/fileapi/file_system_types.h"
 
 namespace base {
-struct PlatformFileInfo;
-class MessageLoopProxy;
 class Time;
 }
 
 namespace fileapi {
 
 using base::PlatformFile;
 using base::PlatformFileError;
 class FileSystemOperationContext;
 
 // A large part of this implementation is taken from base::FileUtilProxy.
 // TODO(dmikurube, kinuko): Clean up base::FileUtilProxy to factor out common
 // routines. It includes dropping FileAPI-specific routines from FileUtilProxy.
 //
 // The default implementations of the virtual methods below (*1) assume the
 // given paths are native ones for the host platform.  The subclasses that
 // perform local path translation/obfuscation must override them.
 //  (*1) All virtual methods which receive FilePath as their arguments:
 //  CreateOrOpen, EnsureFileExists, GetLocalFilePath, GetFileInfo,
 //  ReadDirectory, CreateDirectory, CopyOrMoveFile, DeleteFile,
 //  DeleteSingleDirectory, Touch, Truncate, PathExists, DirectoryExists,
 //  IsDirectoryEmpty and CreateFileEnumerator.
 //
 // The methods below (*2) assume the given paths may not be native ones for the
 // host platform.  The subclasses should not override them.  They provide basic
 // meta logic by using other virtual methods.
 //  (*2) All non-virtual methods: Copy, Move, Delete, DeleteDirectoryRecursive,
 //  PerformCommonCheckAndPreparationForMoveAndCopy and CopyOrMoveDirectory.
-class FileSystemFileUtil {
+class FileApiFileUtil {
  public:
-  FileSystemFileUtil() {}
-  virtual ~FileSystemFileUtil() {}
+  FileApiFileUtil();
+  explicit FileApiFileUtil(FileApiFileUtil* underlying_file_util);
+  virtual ~FileApiFileUtil();
 
   // Creates or opens a file with the given flags.  It is invalid to pass NULL
   // for the callback.
   // If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to create
   // a new file at the given |file_path| and calls back with
   // PLATFORM_FILE_ERROR_FILE_EXISTS if the |file_path| already exists.
   virtual PlatformFileError CreateOrOpen(
       FileSystemOperationContext* context,
       const FilePath& file_path,
       int file_flags,
@@ skipping 50 matching lines @@
 
   // Copies or moves a single file.
   virtual PlatformFileError CopyOrMoveFile(
       FileSystemOperationContext* context,
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       bool copy);
 
   // Copies in a single file from a different filesystem.  The src_file_path is
   // a true local platform path, regardless of which subclass of
-  // FileSystemFileUtil is being invoked.
+  // FileApiFileUtil is being invoked.
   virtual PlatformFileError CopyInForeignFile(
         FileSystemOperationContext* context,
         const FilePath& src_file_path,
         const FilePath& dest_file_path);
 
   // Copies a file or a directory from |src_file_path| to |dest_file_path|.
   //
   // Error cases:
   // If destination's parent doesn't exist.
   // If source dir exists but destination path is an existing file.
@@ skipping 92 matching lines @@
 
     virtual bool IsDirectory() = 0;
   };
 
   class EmptyFileEnumerator : public AbstractFileEnumerator {
     virtual FilePath Next() { return FilePath(); }
     virtual bool IsDirectory() { return false; }
   };
 
   // Returns a pointer to a new instance of AbstractFileEnumerator which is
-  // implemented for each FileUtil subclass. The instance needs to be freed
-  // by the caller, and its lifetime should not extend past when the current
-  // call returns to the main FILE message loop.
+  // implemented for each FileApiFileUtil subclass. The instance needs to be
+  // freed by the caller, and its lifetime should not extend past when the
+  // current call returns to the main FILE message loop.
   virtual AbstractFileEnumerator* CreateFileEnumerator(
       FileSystemOperationContext* unused,
       const FilePath& root_path);
 
  protected:
   // Deletes a directory and all entries under the directory.
   //
   // This method is called from Delete.  It internally calls two following
   // virtual methods,
   // - (virtual) DeleteFile to delete files, and
@@ skipping 24 matching lines @@
   // Determines whether a simple same-filesystem move or copy can be done.  If
   // so, it delegates to CopyOrMoveFile.  Otherwise it looks up the true
   // platform path of the source file, delegates to CopyInForeignFile, and [for
   // move] calls DeleteFile on the source file.
   PlatformFileError CopyOrMoveFileHelper(
       FileSystemOperationContext* context,
       const FilePath& src_file_path,
       const FilePath& dest_file_path,
       bool copy);
 
-  DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
+  FileApiFileUtil* underlying_file_util() const {
+    return underlying_file_util_.get();
+  }
+
+ private:
+  scoped_ptr<FileApiFileUtil> underlying_file_util_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileApiFileUtil);
 };
 
 }  // namespace fileapi
 
-#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
+#endif  // WEBKIT_FILEAPI_FILE_UTIL_H_