// 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.

#include "base/prefs/default_pref_store.h"
#include "base/logging.h"

using base::Value;

DefaultPrefStore::DefaultPrefStore() {}

bool DefaultPrefStore::GetValue(const std::string& key,
                                const Value** result) const {
  return prefs_.GetValue(key, result);
}

void DefaultPrefStore::AddObserver(PrefStore::Observer* observer) {
  observers_.AddObserver(observer);
}

void DefaultPrefStore::RemoveObserver(PrefStore::Observer* observer) {
  observers_.RemoveObserver(observer);
}

size_t DefaultPrefStore::NumberOfObservers() const {
  return observers_.size();
}

void DefaultPrefStore::SetDefaultValue(const std::string& key,
                                       scoped_ptr<Value> value) {
  DCHECK(!GetValue(key, NULL));
  prefs_.SetValue(key, value.release());
}

void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
                                           scoped_ptr<Value> value) {
  const Value* old_value = NULL;
  GetValue(key, &old_value);
  bool notify = !old_value->Equals(value.get());
  prefs_.SetValue(key, value.release());
  if (notify)
    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
}

DefaultPrefStore::const_iterator DefaultPrefStore::begin() const {
  return prefs_.begin();
}

DefaultPrefStore::const_iterator DefaultPrefStore::end() const {
  return prefs_.end();
}

DefaultPrefStore::~DefaultPrefStore() {}