1 files changed, 64 insertions, 0 deletions
diff --git a/chrome/browser/prefs/pref_value_map.h b/chrome/browser/prefs/pref_value_map.h
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+++ b/chrome/browser/prefs/pref_value_map.h
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+// Copyright (c) 2010 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_
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+
+class Value;
+
+// A generic string to value map used by the PrefStore implementations.
+class PrefValueMap {
+ public:
+  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, Value** value) const;
+
+  // 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, 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();
+
+  // 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;
+
+  // 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);
+
+  // 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, Value*> Map;
+
+  Map prefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefValueMap);
+};
+
+#endif  // CHROME_BROWSER_PREFS_PREF_VALUE_MAP_H_