webkit/fileapi/file_system_origin_database.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef WEBKIT_FILEAPI_FILE_SYSTEM_ORIGIN_DATABASE_H_
   6 #define WEBKIT_FILEAPI_FILE_SYSTEM_ORIGIN_DATABASE_H_
   7
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/file_path.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "third_party/leveldatabase/src/include/leveldb/db.h"
  15
  16 namespace tracked_objects {
  17 class Location;
  18 }
  19
  20 namespace fileapi {
  21
  22 // All methods of this class other than the constructor may be used only from
  23 // the browser's FILE thread.  The constructor may be used on any thread.
  24 class FileSystemOriginDatabase {
  25  public:
  26   struct OriginRecord {
  27     std::string origin;
  28     FilePath path;
  29
  30     OriginRecord();
  31     OriginRecord(const std::string& origin, const FilePath& path);
  32     ~OriginRecord();
  33   };
  34
  35   // Only one instance of FileSystemOriginDatabase should exist for a given path
  36   // at a given time.
  37   explicit FileSystemOriginDatabase(const FilePath& path);
  38   ~FileSystemOriginDatabase();
  39
  40   bool HasOriginPath(const std::string& origin);
  41
  42   // This will produce a unique path and add it to its database, if it's not
  43   // already present.
  44   bool GetPathForOrigin(const std::string& origin, FilePath* directory);
  45
  46   // Also returns success if the origin is not found.
  47   bool RemovePathForOrigin(const std::string& origin);
  48
  49   bool ListAllOrigins(std::vector<OriginRecord>* origins);
  50
  51   // This will release all database resources in use; call it to save memory.
  52   void DropDatabase();
  53
  54  private:
  55   bool Init();
  56   void HandleError(const tracked_objects::Location& from_here,
  57                    leveldb::Status status);
  58   bool GetLastPathNumber(int* number);
  59
  60   std::string path_;
  61   scoped_ptr<leveldb::DB> db_;
  62   DISALLOW_COPY_AND_ASSIGN(FileSystemOriginDatabase);
  63 };
  64
  65 }  // namespace fileapi
  66
  67 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_ORIGIN_DATABASE_H_