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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_DIRECTORY_DATABASE_H
#define WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H
#include <string>
#include <vector>
#include "base/file_path.h"
#include "base/scoped_ptr.h"
#include "base/time.h"
#include "third_party/leveldb/include/leveldb/db.h"
namespace leveldb {
class WriteBatch;
}
namespace fileapi {
// This class WILL NOT protect you against producing directory loops, giving an
// empty directory a backing data file, giving two files the same backing file,
// or pointing to a nonexistent backing file. It does no file IO other than
// that involved with talking to its underlying database. It does not create or
// in any way touch real files; it only creates path entries in its database.
// TODO(ericu): Safe mode, which does more checks such as the above on debug
// builds.
// TODO(ericu): FSCK, for a full-database check [data file validation possibly
// done elsewhere].
// TODO(ericu): Add a method that will give a unique filename for a data file.
class FileSystemDirectoryDatabase {
public:
typedef int64 FileId;
struct FileInfo {
FileInfo();
~FileInfo();
bool is_directory() {
return data_path.empty();
}
FileId parent_id;
FilePath data_path;
std::string name;
// We could get this from the file if we touched it on every move.
base::Time modification_time;
};
FileSystemDirectoryDatabase(const FilePath& path);
~FileSystemDirectoryDatabase();
bool GetChildWithName(
FileId parent_id, const std::string& name, FileId* child_id);
// ListChildren will succeed, returning 0 children, if parent_id doesn't
// exist.
bool ListChildren(FileId parent_id, std::vector<FileId>* children);
bool GetFileInfo(FileId file_id, FileInfo* info);
bool AddFileInfo(const FileInfo& info, FileId* file_id);
bool RemoveFileInfo(FileId file_id);
// This does a full update of the FileInfo, and is what you'd use for moves
// and renames. If you just want to update the modification_time, use
// UpdateModificationTime.
bool UpdateFileInfo(FileId file_id, const FileInfo& info);
bool UpdateModificationTime(
FileId file_id, const base::Time& modification_time);
private:
bool Init();
bool GetLastFileId(FileId* file_id);
bool VerifyIsDirectory(FileId file_id);
bool AddFileInfoHelper(
const FileInfo& info, FileId file_id, leveldb::WriteBatch* batch);
bool RemoveFileInfoHelper(FileId file_id, leveldb::WriteBatch* batch);
void HandleError(leveldb::Status status);
std::string path_;
scoped_ptr<leveldb::DB> db_;
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_FILE_SYSTEM_DIRECTORY_DATABASE_H
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