Move webkit/{browser,common}/dom_storage into content/

webkit/browser/dom_storage/dom_storage_area.h

-// Copyright (c) 2012 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_BROWSER_DOM_STORAGE_DOM_STORAGE_AREA_H_
-#define WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_AREA_H_
-
-#include "base/files/file_path.h"
-#include "base/gtest_prod_util.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/nullable_string16.h"
-#include "base/strings/string16.h"
-#include "url/gurl.h"
-#include "webkit/browser/webkit_storage_browser_export.h"
-#include "webkit/common/dom_storage/dom_storage_types.h"
-
-namespace dom_storage {
-
-class DomStorageDatabaseAdapter;
-class DomStorageMap;
-class DomStorageTaskRunner;
-class SessionStorageDatabase;
-
-// Container for a per-origin Map of key/value pairs potentially
-// backed by storage on disk and lazily commits changes to disk.
-// See class comments for DomStorageContext for a larger overview.
-class WEBKIT_STORAGE_BROWSER_EXPORT DomStorageArea
-    : public base::RefCountedThreadSafe<DomStorageArea> {
-
- public:
-  static const base::FilePath::CharType kDatabaseFileExtension[];
-  static base::FilePath DatabaseFileNameFromOrigin(const GURL& origin);
-  static GURL OriginFromDatabaseFileName(const base::FilePath& file_name);
-
-  // Local storage. Backed on disk if directory is nonempty.
-  DomStorageArea(const GURL& origin,
-                 const base::FilePath& directory,
-                 DomStorageTaskRunner* task_runner);
-
-  // Session storage. Backed on disk if |session_storage_backing| is not NULL.
-  DomStorageArea(int64 namespace_id,
-                 const std::string& persistent_namespace_id,
-                 const GURL& origin,
-                 SessionStorageDatabase* session_storage_backing,
-                 DomStorageTaskRunner* task_runner);
-
-  const GURL& origin() const { return origin_; }
-  int64 namespace_id() const { return namespace_id_; }
-
-  // Writes a copy of the current set of values in the area to the |map|.
-  void ExtractValues(ValuesMap* map);
-
-  unsigned Length();
-  base::NullableString16 Key(unsigned index);
-  base::NullableString16 GetItem(const base::string16& key);
-  bool SetItem(const base::string16& key, const base::string16& value,
-               base::NullableString16* old_value);
-  bool RemoveItem(const base::string16& key, base::string16* old_value);
-  bool Clear();
-  void FastClear();
-
-  DomStorageArea* ShallowCopy(
-      int64 destination_namespace_id,
-      const std::string& destination_persistent_namespace_id);
-
-  bool HasUncommittedChanges() const;
-
-  // Similar to Clear() but more optimized for just deleting
-  // without raising events.
-  void DeleteOrigin();
-
-  // Frees up memory when possible. Typically, this method returns
-  // the object to its just constructed state, however if uncommitted
-  // changes are pending, it does nothing.
-  void PurgeMemory();
-
-  // Schedules the commit of any unsaved changes and enters a
-  // shutdown state such that the value getters and setters will
-  // no longer do anything.
-  void Shutdown();
-
-  // Returns true if the data is loaded in memory.
-  bool IsLoadedInMemory() const { return is_initial_import_done_; }
-
- private:
-  friend class DomStorageAreaTest;
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, DomStorageAreaBasics);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, BackingDatabaseOpened);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, TestDatabaseFilePath);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, CommitTasks);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, CommitChangesAtShutdown);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, DeleteOrigin);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageAreaTest, PurgeMemory);
-  FRIEND_TEST_ALL_PREFIXES(DomStorageContextTest, PersistentIds);
-  friend class base::RefCountedThreadSafe<DomStorageArea>;
-
-  struct CommitBatch {
-    bool clear_all_first;
-    ValuesMap changed_values;
-    CommitBatch();
-    ~CommitBatch();
-  };
-
-  ~DomStorageArea();
-
-  // If we haven't done so already and this is a local storage area,
-  // will attempt to read any values for this origin currently
-  // stored on disk.
-  void InitialImportIfNeeded();
-
-  // Post tasks to defer writing a batch of changed values to
-  // disk on the commit sequence, and to call back on the primary
-  // task sequence when complete.
-  CommitBatch* CreateCommitBatchIfNeeded();
-  void OnCommitTimer();
-  void CommitChanges(const CommitBatch* commit_batch);
-  void OnCommitComplete();
-
-  void ShutdownInCommitSequence();
-
-  int64 namespace_id_;
-  std::string persistent_namespace_id_;
-  GURL origin_;
-  base::FilePath directory_;
-  scoped_refptr<DomStorageTaskRunner> task_runner_;
-  scoped_refptr<DomStorageMap> map_;
-  scoped_ptr<DomStorageDatabaseAdapter> backing_;
-  scoped_refptr<SessionStorageDatabase> session_storage_backing_;
-  bool is_initial_import_done_;
-  bool is_shutdown_;
-  scoped_ptr<CommitBatch> commit_batch_;
-  int commit_batches_in_flight_;
-};
-
-}  // namespace dom_storage
-
-#endif  // WEBKIT_BROWSER_DOM_STORAGE_DOM_STORAGE_AREA_H_