Move the bits of Prefs where production code has only trivially easy

chrome/browser/prefs/pref_value_map.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 CHROME_BROWSER_PREFS_PREF_VALUE_MAP_H_
-#define CHROME_BROWSER_PREFS_PREF_VALUE_MAP_H_
-
-#include <map>
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-
-namespace base {
-class Value;
-}
-
-// A generic string to value map used by the PrefStore implementations.
-class PrefValueMap {
- public:
-  typedef std::map<std::string, base::Value*>::iterator iterator;
-  typedef std::map<std::string, base::Value*>::const_iterator const_iterator;
-
-  PrefValueMap();
-  virtual ~PrefValueMap();
-
-  // Gets the value for |key| and stores it in |value|. Ownership remains with
-  // the map. Returns true if a value is present. If not, |value| is not
-  // touched.
-  bool GetValue(const std::string& key, const base::Value** value) const;
-  bool GetValue(const std::string& key, base::Value** value);
-
-  // Sets a new |value| for |key|. Takes ownership of |value|, which must be
-  // non-NULL. Returns true if the value changed.
-  bool SetValue(const std::string& key, base::Value* value);
-
-  // Removes the value for |key| from the map. Returns true if a value was
-  // removed.
-  bool RemoveValue(const std::string& key);
-
-  // Clears the map.
-  void Clear();
-
-  // Swaps the contents of two maps.
-  void Swap(PrefValueMap* other);
-
-  iterator begin();
-  iterator end();
-  const_iterator begin() const;
-  const_iterator end() const;
-
-  // Gets a boolean value for |key| and stores it in |value|. Returns true if
-  // the value was found and of the proper type.
-  bool GetBoolean(const std::string& key, bool* value) const;
-
-  // Sets the value for |key| to the boolean |value|.
-  void SetBoolean(const std::string& key, bool value);
-
-  // Gets a string value for |key| and stores it in |value|. Returns true if
-  // the value was found and of the proper type.
-  bool GetString(const std::string& key, std::string* value) const;
-
-  // Sets the value for |key| to the string |value|.
-  void SetString(const std::string& key, const std::string& value);
-
-  // Gets an int value for |key| and stores it in |value|. Returns true if
-  // the value was found and of the proper type.
-  bool GetInteger(const std::string& key, int* value) const;
-
-  // Sets the value for |key| to the int |value|.
-  void SetInteger(const std::string& key, const int value);
-
-  // Compares this value map against |other| and stores all key names that have
-  // different values in |differing_keys|. This includes keys that are present
-  // only in one of the maps.
-  void GetDifferingKeys(const PrefValueMap* other,
-                        std::vector<std::string>* differing_keys) const;
-
- private:
-  typedef std::map<std::string, base::Value*> Map;
-
-  Map prefs_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrefValueMap);
-};
-
-#endif  // CHROME_BROWSER_PREFS_PREF_VALUE_MAP_H_