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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.
#include "chrome/browser/prefs/pref_value_map.h"
#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/stl_util-inl.h"
#include "base/values.h"
PrefValueMap::PrefValueMap() {}
PrefValueMap::~PrefValueMap() {
Clear();
}
bool PrefValueMap::GetValue(const std::string& key, Value** value) const {
const Map::const_iterator entry = prefs_.find(key);
if (entry != prefs_.end()) {
if (value)
*value = entry->second;
return true;
}
return false;
}
bool PrefValueMap::SetValue(const std::string& key, Value* value) {
DCHECK(value);
scoped_ptr<Value> value_ptr(value);
const Map::iterator entry = prefs_.find(key);
if (entry != prefs_.end()) {
if (Value::Equals(entry->second, value))
return false;
delete entry->second;
entry->second = value_ptr.release();
} else {
prefs_[key] = value_ptr.release();
}
return true;
}
bool PrefValueMap::RemoveValue(const std::string& key) {
const Map::iterator entry = prefs_.find(key);
if (entry != prefs_.end()) {
delete entry->second;
prefs_.erase(entry);
return true;
}
return false;
}
void PrefValueMap::Clear() {
STLDeleteValues(&prefs_);
prefs_.clear();
}
bool PrefValueMap::GetBoolean(const std::string& key,
bool* value) const {
Value* stored_value = NULL;
return GetValue(key, &stored_value) && stored_value->GetAsBoolean(value);
}
bool PrefValueMap::GetString(const std::string& key,
std::string* value) const {
Value* stored_value = NULL;
return GetValue(key, &stored_value) && stored_value->GetAsString(value);
}
void PrefValueMap::SetString(const std::string& key,
const std::string& value) {
SetValue(key, Value::CreateStringValue(value));
}
void PrefValueMap::GetDifferingKeys(
const PrefValueMap* other,
std::vector<std::string>* differing_keys) const {
differing_keys->clear();
// Walk over the maps in lockstep, adding everything that is different.
Map::const_iterator this_pref(prefs_.begin());
Map::const_iterator other_pref(other->prefs_.begin());
while (this_pref != prefs_.end() && other_pref != other->prefs_.end()) {
const int diff = this_pref->first.compare(other_pref->first);
if (diff == 0) {
if (!this_pref->second->Equals(other_pref->second))
differing_keys->push_back(this_pref->first);
++this_pref;
++other_pref;
} else if (diff < 0) {
differing_keys->push_back(this_pref->first);
++this_pref;
} else if (diff > 0) {
differing_keys->push_back(other_pref->first);
++other_pref;
}
}
// Add the remaining entries.
for ( ; this_pref != prefs_.end(); ++this_pref)
differing_keys->push_back(this_pref->first);
for ( ; other_pref != other->prefs_.end(); ++other_pref)
differing_keys->push_back(other_pref->first);
}
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