Stackable file_util for FileAPIs. Sample code for discussion. Incomplete. Cannot be compiled.

webkit/fileapi/file_system_file_util_base.h

Index: webkit/fileapi/file_system_file_util_base.h
diff --git a/webkit/fileapi/file_system_file_util_base.h b/webkit/fileapi/file_system_file_util_base.h
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index 0000000000000000000000000000000000000000..bd4f7f352d34a936df8c9c2682faef7110fe84b5
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+++ b/webkit/fileapi/file_system_file_util_base.h
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+// 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_BASE_H_
+#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_BASE_H_
+
+#include "base/file_util.h"
+#include "base/file_util_proxy.h"
+#include "base/scoped_ptr.h"
+#include "base/singleton.h"
+#include "webkit/fileapi/file_system_operation_context.h"
+
+namespace fileapi {
+
+class FileSystemFileUtilBase {
+ public:
+  static FileSystemFileUtilBase* GetInstance();
+  virtual ~FileSystemFileUtilBase() {}
+
+virtual base::PlatformFileError CreateOrOpen(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    int file_flags,
+    base::PlatformFile& file_handle,
+    bool& created);
+
+virtual base::PlatformFileError CreateTemporary(
+    FileSystemOperationContext* fs_context,
+    FilePath& file_path,
+    base::PlatformFile& file_handle);
+
+virtual base::PlatformFileError Close(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file_handle);
+
+virtual base::PlatformFileError EnsureFileExists(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    bool* created);
+
+virtual base::PlatformFileError Delete(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    bool recursive);
+
+virtual base::PlatformFileError Copy(
+    FileSystemOperationContext* fs_context,
+    const FilePath& src_file_path,
+    const FilePath& dest_file_path);
+
+virtual base::PlatformFileError Move(
+    FileSystemOperationContext* fs_context,
+    const FilePath& src_file_path,
+    const FilePath& dest_file_path);
+
+virtual base::PlatformFileError CreateDirectory(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    bool exclusive,
+    bool recursive);
+
+virtual base::PlatformFileError ReadDirectory(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    std::vector<base::FileUtilProxy::Entry>& entries);
+
+virtual base::PlatformFileError GetFileInfo(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    base::PlatformFileInfo& file_info);
+
+virtual base::PlatformFileError GetFileInfoFromPlatformFile(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file,
+    base::PlatformFileInfo& file_info);
+
+virtual base::PlatformFileError Read(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file,
+    int64 offset,
+    int bytes_to_read,
+    int& bytes_read,
+    char* buffer);
+
+virtual base::PlatformFileError Write(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file,
+    int64 offset,
+    int bytes_to_write,
+    int& bytes_written,
+    char* buffer);
+
+virtual base::PlatformFileError Touch(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time);
+
+virtual base::PlatformFileError TouchFilePath(
+    FileSystemOperationContext* fs_context,
+    const FilePath& file_path,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time);
+
+virtual base::PlatformFileError TruncatePlatformFile(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file,
+    int64 length);
+
+virtual base::PlatformFileError Truncate(
+    FileSystemOperationContext* fs_context,
+    const FilePath& path,
+    int64 length);
+
+virtual base::PlatformFileError Flush(
+    FileSystemOperationContext* fs_context,
+    base::PlatformFile file);
+
+ protected:
+  FileSystemFileUtilBase() {}
+
+ private:
+  friend struct DefaultSingletonTraits<FileSystemFileUtilBase>;
+  DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtilBase);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_BASE_H_