Move dom_storage to new locations.

webkit/dom_storage/session_storage_database.h

Index: webkit/dom_storage/session_storage_database.h
===================================================================
--- webkit/dom_storage/session_storage_database.h	(revision 203766)
+++ webkit/dom_storage/session_storage_database.h	(working copy)
@@ -1,205 +0,0 @@
-// 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_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_
-#define WEBKIT_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_
-
-#include <map>
-#include <string>
-
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/synchronization/lock.h"
-#include "third_party/leveldatabase/src/include/leveldb/status.h"
-#include "webkit/dom_storage/dom_storage_types.h"
-#include "webkit/storage/webkit_storage_export.h"
-
-class GURL;
-
-namespace leveldb {
-class DB;
-struct ReadOptions;
-class WriteBatch;
-}  // namespace leveldb
-
-namespace dom_storage {
-
-// SessionStorageDatabase holds the data from multiple namespaces and multiple
-// origins. All DomStorageAreas for session storage share the same
-// SessionStorageDatabase.
-
-// Only one thread is allowed to call the public functions other than
-// ReadAreaValues and ReadNamespacesAndOrigins. Other threads are allowed to
-// call ReadAreaValues and ReadNamespacesAndOrigins.
-class WEBKIT_STORAGE_EXPORT SessionStorageDatabase :
-    public base::RefCountedThreadSafe<SessionStorageDatabase> {
- public:
-  explicit SessionStorageDatabase(const base::FilePath& file_path);
-
-  // Reads the (key, value) pairs for |namespace_id| and |origin|. |result| is
-  // assumed to be empty and any duplicate keys will be overwritten. If the
-  // database exists on disk then it will be opened. If it does not exist then
-  // it will not be created and |result| will be unmodified.
-  void ReadAreaValues(const std::string& namespace_id,
-                      const GURL& origin,
-                      ValuesMap* result);
-
-  // Updates the data for |namespace_id| and |origin|. Will remove all keys
-  // before updating the database if |clear_all_first| is set. Then all entries
-  // in |changes| will be examined - keys mapped to a null NullableString16 will
-  // be removed and all others will be inserted/updated as appropriate. It is
-  // allowed to write data into a shallow copy created by CloneNamespace, and in
-  // that case the copy will be made deep before writing the values.
-  bool CommitAreaChanges(const std::string& namespace_id,
-                         const GURL& origin,
-                         bool clear_all_first,
-                         const ValuesMap& changes);
-
-  // Creates shallow copies of the areas for |namespace_id| and associates them
-  // with |new_namespace_id|.
-  bool CloneNamespace(const std::string& namespace_id,
-                      const std::string& new_namespace_id);
-
-  // Deletes the data for |namespace_id| and |origin|.
-  bool DeleteArea(const std::string& namespace_id, const GURL& origin);
-
-  // Deletes the data for |namespace_id|.
-  bool DeleteNamespace(const std::string& namespace_id);
-
-  // Reads the namespace IDs and origins present in the database.
-  bool ReadNamespacesAndOrigins(
-      std::map<std::string, std::vector<GURL> >* namespaces_and_origins);
-
- private:
-  friend class base::RefCountedThreadSafe<SessionStorageDatabase>;
-  friend class SessionStorageDatabaseTest;
-
-  ~SessionStorageDatabase();
-
-  // Opens the database at file_path_ if it exists already and creates it if
-  // |create_if_needed| is true. Returns true if the database was opened, false
-  // if the opening failed or was not necessary (the database doesn't exist and
-  // |create_if_needed| is false). The possible failures are:
-  // - leveldb cannot open the database.
-  // - The database is in an inconsistent or errored state.
-  bool LazyOpen(bool create_if_needed);
-
-  // Tries to open the database at file_path_, assigns |db| to point to the
-  // opened leveldb::DB instance.
-  leveldb::Status TryToOpen(leveldb::DB** db);
-
-  // Returns true if the database is already open, false otherwise.
-  bool IsOpen() const;
-
-  // Helpers for checking caller erros, invariants and database errors. All
-  // these return |ok|, for chaining.
-  bool CallerErrorCheck(bool ok) const;
-  bool ConsistencyCheck(bool ok);
-  bool DatabaseErrorCheck(bool ok);
-
-  // Helper functions. All return true if the operation succeeded, and false if
-  // it failed (a database error or a consistency error). If the return type is
-  // void, the operation cannot fail. If they return false, ConsistencyCheck or
-  // DatabaseErrorCheck have already been called.
-
-  // Creates a namespace for |namespace_id| and updates the next namespace id if
-  // needed. If |ok_if_exists| is false, checks that the namespace didn't exist
-  // before.
-  bool CreateNamespace(const std::string& namespace_id,
-                       bool ok_if_exists,
-                       leveldb::WriteBatch* batch);
-
-  // Reads the areas assoiated with |namespace_id| and puts the (origin, map_id)
-  // pairs into |areas|.
-  bool GetAreasInNamespace(const std::string& namespace_id,
-                           std::map<std::string, std::string>* areas);
-
-  // Adds an association between |origin| and |map_id| into the namespace
-  // |namespace_id|.
-  void AddAreaToNamespace(const std::string& namespace_id,
-                          const std::string& origin,
-                          const std::string& map_id,
-                          leveldb::WriteBatch* batch);
-
-  // Helpers for deleting data for |namespace_id| and |origin|.
-  bool DeleteAreaHelper(const std::string& namespace_id,
-                        const std::string& origin,
-                        leveldb::WriteBatch* batch);
-
-  // Retrieves the map id for |namespace_id| and |origin|. It's not an error if
-  // the map doesn't exist.
-  bool GetMapForArea(const std::string& namespace_id,
-                     const std::string& origin,
-                     const leveldb::ReadOptions& options,
-                     bool* exists,
-                     std::string* map_id);
-
-  // Creates a new map for |namespace_id| and |origin|. |map_id| will hold the
-  // id of the created map. If there is a map for |namespace_id| and |origin|,
-  // this just overwrites the map id. The caller is responsible for decreasing
-  // the ref count.
-  bool CreateMapForArea(const std::string& namespace_id,
-                        const GURL& origin,
-                        std::string* map_id,
-                        leveldb::WriteBatch* batch);
-  // Reads the contents of the map |map_id| into |result|. If |only_keys| is
-  // true, only keys are aread from the database and the values in |result| will
-  // be empty.
-  bool ReadMap(const std::string& map_id,
-               const leveldb::ReadOptions& options,
-               ValuesMap* result,
-               bool only_keys);
-  // Writes |values| into the map |map_id|.
-  void WriteValuesToMap(const std::string& map_id,
-                        const ValuesMap& values,
-                        leveldb::WriteBatch* batch);
-
-  bool GetMapRefCount(const std::string& map_id, int64* ref_count);
-  bool IncreaseMapRefCount(const std::string& map_id,
-                           leveldb::WriteBatch* batch);
-  // Decreases the ref count of a map by |decrease|. If the ref count goes to 0,
-  // deletes the map.
-  bool DecreaseMapRefCount(const std::string& map_id,
-                           int decrease,
-                           leveldb::WriteBatch* batch);
-
-  // Deletes all values in |map_id|.
-  bool ClearMap(const std::string& map_id, leveldb::WriteBatch* batch);
-
-  // Breaks the association between (|namespace_id|, |origin|) and |map_id| and
-  // creates a new map for (|namespace_id|, |origin|). Copies the data from the
-  // old map if |copy_data| is true.
-  bool DeepCopyArea(const std::string& namespace_id,
-                    const GURL& origin,
-                    bool copy_data,
-                    std::string* map_id,
-                    leveldb::WriteBatch* batch);
-
-  // Helper functions for creating the keys needed for the schema.
-  static std::string NamespaceStartKey(const std::string& namespace_id);
-  static std::string NamespaceKey(const std::string& namespace_id,
-                                  const std::string& origin);
-  static const char* NamespacePrefix();
-  static std::string MapRefCountKey(const std::string& map_id);
-  static std::string MapKey(const std::string& map_id, const std::string& key);
-  static const char* NextMapIdKey();
-
-  scoped_ptr<leveldb::DB> db_;
-  base::FilePath file_path_;
-
-  // For protecting the database opening code.
-  base::Lock db_lock_;
-
-  // True if a database error has occurred (e.g., cannot read data).
-  bool db_error_;
-  // True if the database is in an inconsistent state.
-  bool is_inconsistent_;
-
-  DISALLOW_COPY_AND_ASSIGN(SessionStorageDatabase);
-};
-
-}  // namespace dom_storage
-
-#endif  // WEBKIT_DOM_STORAGE_SESSION_STORAGE_DATABASE_H_