Implement async verision of FileSystemFileUtil and in-memory file system for testing purposes.

webkit/chromeos/fileapi/memory_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_CHROMEOS_FILEAPI_FILE_SYSTEM_FILE_UTIL_MEMORY_H_
+#define WEBKIT_CHROMEOS_FILEAPI_FILE_SYSTEM_FILE_UTIL_MEMORY_H_
+
+#include <map>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/time.h"
+#include "webkit/chromeos/fileapi/file_util_async.h"
+
+namespace fileapi {
+
+// The in-memory file system. Primarily for the purpose of testing
+// FileUtilAsync.
+class MemoryFileUtil : public FileUtilAsync {
+ public:
+  MemoryFileUtil(const FilePath& root_path);
+
+  virtual void GetFileInfo(
+      const FilePath& file_path,
+      const GetFileInfoCallback& callback) OVERRIDE;
+  virtual void Create(
+      const FilePath& file_path,
+      const StatusCallback& callback) OVERRIDE;
+  virtual void Truncate(
+      const FilePath& file_path,
+      int64 length,
+      const StatusCallback& callback) OVERRIDE;
+  // This FS ignores last_access_time.
+  virtual void Touch(
+      const FilePath& file_path,
+      const base::Time& last_access_time,
+      const base::Time& last_modified_time,
+      const StatusCallback& callback) OVERRIDE;
+  virtual void Remove(
+      const FilePath& file_path,
+      bool recursive,
+      const StatusCallback& callback) OVERRIDE;
+  virtual void CreateDirectory(
+      const FilePath& dir_path,
+      const StatusCallback& callback) OVERRIDE;
+  virtual void ReadDirectory(
+      const FilePath& dir_path,
+      const ReadDirectoryCallback& callback) OVERRIDE;
+
+ protected:
+  virtual void Write(
+      const FilePath& file_path,
+      int64 offset,
+      const char* data,
+      int64 length,
+      const ReadWriteCallback& callback) OVERRIDE;
+  virtual void Read(
+      const FilePath& file_path,
+      int64 offset,
+      char* buffer,
+      int64 length,
+      const ReadWriteCallback& callback) OVERRIDE;
+
+ private:
+  friend class MemoryFileUtilTest;
+
+  struct FileEntry {
+    bool is_directory;
+    std::vector<char> contents;
+    base::Time last_modified;
+  };
+
+  typedef std::map<FilePath, FileEntry>::iterator FileIterator;
+  typedef std::map<FilePath, FileEntry>::const_iterator ConstFileIterator;
+
+  FileIterator GetFile(const FilePath& file_path) {
+    return files_.find(file_path);
+  }
+
+  bool FileExists(const FilePath& file_path) {
+    return files_.find(file_path) != files_.end();
+  }
+
+  bool IsDirectory(const FilePath& file_path);
+
+  void DoGetFileInfo(
+      const FilePath& file_path,
+      const GetFileInfoCallback& callback);
+
+  void DoCreate(
+      const FilePath& file_path,
+      bool is_directory,
+      const StatusCallback& callback);
+
+  void DoTruncate(
+      const FilePath& file_path,
+      int64 length,
+      const StatusCallback& callback);
+
+  void DoTouch(
+      const FilePath& file_path,
+      const base::Time& last_modified_time,
+      const StatusCallback& callback);
+
+  void DoRemoveSingleFile(
+      const FilePath& file_path,
+      const StatusCallback& callback);
+
+  void DoRemoveRecursive(
+      const FilePath& file_path,
+      const StatusCallback& callback);
+
+  // Will start enumerating with file path |from|. If |from| path is
+  // empty, will start from the beginning.
+  void DoReadDirectory(
+      const FilePath& dir_path,
+      const FilePath& from,
+      const ReadDirectoryCallback& callback);
+
+  void DoRead(
+      const FilePath& file_path,
+      int64 offset,
+      char* buffer,
+      int64 length,
+      const ReadWriteCallback& callback);
+
+  void DoWrite(
+      const FilePath& file_path,
+      int64 offset,
+      const char* data,
+      int64 length,
+      const ReadWriteCallback& callback);
+
+  // Mainly for the purpose of testing.
+  void set_read_directory_buffer_size(size_t size) {
+    read_directory_buffer_size_ = size;
+  }
+
+  std::map<FilePath, FileEntry> files_;
+
+  size_t read_directory_buffer_size_;
+  std::vector<DirectoryEntry> read_directory_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryFileUtil);
+};
+
+}
+
+#endif  // WEBKIT_CHROMEOS_FILEAPI_FILE_SYSTEM_FILE_UTIL_ASYNC_H_