Rename FileUtilProxy::Create to EnsureFileExists

base/file_util_proxy.h

 // Copyright (c) 2010 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 BASE_FILE_UTIL_PROXY_H_
 #define BASE_FILE_UTIL_PROXY_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 22 matching lines @@
 class FileUtilProxy {
  public:
   // This callback is used by methods that report only an error code.  It is
   // valid to pass NULL as the callback parameter to any function that takes a
   // StatusCallback, in which case the operation will complete silently.
   typedef Callback1<base::PlatformFileError /* error code */
                     >::Type StatusCallback;
 
   // 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.
   typedef Callback3<base::PlatformFileError /* error code */,
                     base::PassPlatformFile,
                     bool /* created */>::Type CreateOrOpenCallback;
   static bool CreateOrOpen(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                            const FilePath& file_path,
                            int file_flags,
                            CreateOrOpenCallback* callback);
 
-  // Creates a file with the given flags.  This one is a variation of
-  // CreateOrOpen but it doesn't return a file handle.
-  static bool Create(scoped_refptr<MessageLoopProxy> message_loop_proxy,
-                     const FilePath& file_path,
-                     int file_flags,
-                     CreateOrOpenCallback* callback);
-
   // Creates a temporary file for writing.  The path and an open file handle
   // are returned.  It is invalid to pass NULL for the callback.
   typedef Callback3<base::PlatformFileError /* error code */,
                     base::PassPlatformFile,
                     FilePath>::Type CreateTemporaryCallback;
   static bool CreateTemporary(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       CreateTemporaryCallback* callback);
 
   // Close the given file handle.
   static bool Close(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                     base::PlatformFile,
                     StatusCallback* callback);
 
+  // Ensures that the given |file_path| exist.  This creates a empty new file
+  // at |file_path| if the |file_path| does not exist.
+  // If a new file han not existed and is created at the |file_path|,
+  // |created| of the callback argument is set true and |error code|
+  // is set PLATFORM_FILE_OK.
+  // If the file already exists, |created| is set false and |error code|
+  // is set PLATFORM_FILE_OK.
+  // If the file hasn't existed but it couldn't be created for some other
+  // reasons, |created| is set false and |error code| indicates the error.
+  typedef Callback2<base::PlatformFileError /* error code */,
+                    bool /* created */>::Type EnsureFileExistsCallback;
+  static bool EnsureFileExists(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      const FilePath& file_path,
+      EnsureFileExistsCallback* callback);
+
   // Retrieves the information about a file. It is invalid to pass NULL for the
   // callback.
   typedef Callback2<base::PlatformFileError /* error code */,
                     const base::PlatformFileInfo& /* file_info */
                     >::Type GetFileInfoCallback;
   static bool GetFileInfo(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       const FilePath& file_path,
       GetFileInfoCallback* callback);
 
@@ skipping 115 matching lines @@
       base::PlatformFile file,
       StatusCallback* callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtilProxy);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILE_UTIL_PROXY_H_