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// Copyright 2013 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 "components/policy/core/common/policy_map.h"
#include <algorithm>
#include "base/callback.h"
#include "base/stl_util.h"
namespace policy {
void PolicyMap::Entry::DeleteOwnedMembers() {
delete value;
value = NULL;
delete external_data_fetcher;
external_data_fetcher = NULL;
}
scoped_ptr<PolicyMap::Entry> PolicyMap::Entry::DeepCopy() const {
scoped_ptr<Entry> copy(new Entry);
copy->level = level;
copy->scope = scope;
if (value)
copy->value = value->DeepCopy();
if (external_data_fetcher) {
copy->external_data_fetcher =
new ExternalDataFetcher(*external_data_fetcher);
}
return copy.Pass();
}
bool PolicyMap::Entry::has_higher_priority_than(
const PolicyMap::Entry& other) const {
if (level == other.level)
return scope > other.scope;
else
return level > other.level;
}
bool PolicyMap::Entry::Equals(const PolicyMap::Entry& other) const {
return level == other.level &&
scope == other.scope &&
Value::Equals(value, other.value) &&
ExternalDataFetcher::Equals(external_data_fetcher,
other.external_data_fetcher);
}
PolicyMap::PolicyMap() {
}
PolicyMap::~PolicyMap() {
Clear();
}
const PolicyMap::Entry* PolicyMap::Get(const std::string& policy) const {
PolicyMapType::const_iterator entry = map_.find(policy);
return entry == map_.end() ? NULL : &entry->second;
}
const Value* PolicyMap::GetValue(const std::string& policy) const {
PolicyMapType::const_iterator entry = map_.find(policy);
return entry == map_.end() ? NULL : entry->second.value;
}
void PolicyMap::Set(const std::string& policy,
PolicyLevel level,
PolicyScope scope,
Value* value,
ExternalDataFetcher* external_data_fetcher) {
Entry& entry = map_[policy];
entry.DeleteOwnedMembers();
entry.level = level;
entry.scope = scope;
entry.value = value;
entry.external_data_fetcher = external_data_fetcher;
}
void PolicyMap::Erase(const std::string& policy) {
PolicyMapType::iterator it = map_.find(policy);
if (it != map_.end()) {
it->second.DeleteOwnedMembers();
map_.erase(it);
}
}
void PolicyMap::Swap(PolicyMap* other) {
map_.swap(other->map_);
}
void PolicyMap::CopyFrom(const PolicyMap& other) {
Clear();
for (const_iterator it = other.begin(); it != other.end(); ++it) {
const Entry& entry = it->second;
Set(it->first, entry.level, entry.scope,
entry.value->DeepCopy(), entry.external_data_fetcher ?
new ExternalDataFetcher(*entry.external_data_fetcher) : NULL);
}
}
scoped_ptr<PolicyMap> PolicyMap::DeepCopy() const {
PolicyMap* copy = new PolicyMap();
copy->CopyFrom(*this);
return make_scoped_ptr(copy);
}
void PolicyMap::MergeFrom(const PolicyMap& other) {
for (const_iterator it = other.begin(); it != other.end(); ++it) {
const Entry* entry = Get(it->first);
if (!entry || it->second.has_higher_priority_than(*entry)) {
Set(it->first, it->second.level, it->second.scope,
it->second.value->DeepCopy(), it->second.external_data_fetcher ?
new ExternalDataFetcher(*it->second.external_data_fetcher) :
NULL);
}
}
}
void PolicyMap::LoadFrom(
const DictionaryValue* policies,
PolicyLevel level,
PolicyScope scope) {
for (DictionaryValue::Iterator it(*policies); !it.IsAtEnd(); it.Advance())
Set(it.key(), level, scope, it.value().DeepCopy(), NULL);
}
void PolicyMap::GetDifferingKeys(const PolicyMap& other,
std::set<std::string>* differing_keys) const {
// Walk over the maps in lockstep, adding everything that is different.
const_iterator iter_this(begin());
const_iterator iter_other(other.begin());
while (iter_this != end() && iter_other != other.end()) {
const int diff = iter_this->first.compare(iter_other->first);
if (diff == 0) {
if (!iter_this->second.Equals(iter_other->second))
differing_keys->insert(iter_this->first);
++iter_this;
++iter_other;
} else if (diff < 0) {
differing_keys->insert(iter_this->first);
++iter_this;
} else {
differing_keys->insert(iter_other->first);
++iter_other;
}
}
// Add the remaining entries.
for ( ; iter_this != end(); ++iter_this)
differing_keys->insert(iter_this->first);
for ( ; iter_other != other.end(); ++iter_other)
differing_keys->insert(iter_other->first);
}
void PolicyMap::FilterLevel(PolicyLevel level) {
PolicyMapType::iterator iter(map_.begin());
while (iter != map_.end()) {
if (iter->second.level != level) {
iter->second.DeleteOwnedMembers();
map_.erase(iter++);
} else {
++iter;
}
}
}
bool PolicyMap::Equals(const PolicyMap& other) const {
return other.size() == size() &&
std::equal(begin(), end(), other.begin(), MapEntryEquals);
}
bool PolicyMap::empty() const {
return map_.empty();
}
size_t PolicyMap::size() const {
return map_.size();
}
PolicyMap::const_iterator PolicyMap::begin() const {
return map_.begin();
}
PolicyMap::const_iterator PolicyMap::end() const {
return map_.end();
}
void PolicyMap::Clear() {
for (PolicyMapType::iterator it = map_.begin(); it != map_.end(); ++it)
it->second.DeleteOwnedMembers();
map_.clear();
}
// static
bool PolicyMap::MapEntryEquals(const PolicyMap::PolicyMapType::value_type& a,
const PolicyMap::PolicyMapType::value_type& b) {
return a.first == b.first && a.second.Equals(b.second);
}
} // namespace policy
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