base/prefs/default_pref_store.cc

   1 // Copyright (c) 2012 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 #include "base/prefs/default_pref_store.h"
   6 #include "base/logging.h"
   7
   8 using base::Value;
   9
  10 DefaultPrefStore::DefaultPrefStore() {}
  11
  12 bool DefaultPrefStore::GetValue(const std::string& key,
  13                                 const Value** result) const {
  14   return prefs_.GetValue(key, result);
  15 }
  16
  17 void DefaultPrefStore::AddObserver(PrefStore::Observer* observer) {
  18   observers_.AddObserver(observer);
  19 }
  20
  21 void DefaultPrefStore::RemoveObserver(PrefStore::Observer* observer) {
  22   observers_.RemoveObserver(observer);
  23 }
  24
  25 bool DefaultPrefStore::HasObservers() const {
  26   return observers_.might_have_observers();
  27 }
  28
  29 void DefaultPrefStore::SetDefaultValue(const std::string& key,
  30                                        scoped_ptr<Value> value) {
  31   DCHECK(!GetValue(key, NULL));
  32   prefs_.SetValue(key, value.Pass());
  33 }
  34
  35 void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
  36                                            scoped_ptr<Value> value) {
  37   const Value* old_value = NULL;
  38   GetValue(key, &old_value);
  39   bool notify = !old_value->Equals(value.get());
  40   prefs_.SetValue(key, value.Pass());
  41   if (notify)
  42     FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
  43 }
  44
  45 DefaultPrefStore::const_iterator DefaultPrefStore::begin() const {
  46   return prefs_.begin();
  47 }
  48
  49 DefaultPrefStore::const_iterator DefaultPrefStore::end() const {
  50   return prefs_.end();
  51 }
  52
  53 DefaultPrefStore::~DefaultPrefStore() {}