blob: 9fa45114859056b84371423767154ab4f4b1b7fd [file] [log] [blame]
// 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_bundle.h"
#include "base/logging.h"
namespace policy {
PolicyBundle::PolicyBundle() {}
PolicyBundle::~PolicyBundle() {
Clear();
}
PolicyMap& PolicyBundle::Get(const PolicyNamespace& ns) {
DCHECK(ns.domain != POLICY_DOMAIN_CHROME || ns.component_id.empty());
std::unique_ptr<PolicyMap>& policy = policy_bundle_[ns];
if (!policy)
policy = std::make_unique<PolicyMap>();
return *policy;
}
const PolicyMap& PolicyBundle::Get(const PolicyNamespace& ns) const {
DCHECK(ns.domain != POLICY_DOMAIN_CHROME || ns.component_id.empty());
auto it = policy_bundle_.find(ns);
return it == end() ? kEmpty_ : *it->second;
}
void PolicyBundle::Swap(PolicyBundle* other) {
policy_bundle_.swap(other->policy_bundle_);
}
void PolicyBundle::CopyFrom(const PolicyBundle& other) {
Clear();
for (auto it = other.begin(); it != other.end(); ++it) {
policy_bundle_[it->first] = it->second->DeepCopy();
}
}
void PolicyBundle::MergeFrom(const PolicyBundle& other) {
// Iterate over both |this| and |other| in order; skip what's extra in |this|,
// add what's missing, and merge the namespaces in common.
auto it_this = policy_bundle_.begin();
auto end_this = policy_bundle_.end();
auto it_other = other.begin();
auto end_other = other.end();
while (it_this != end_this && it_other != end_other) {
if (it_this->first == it_other->first) {
// Same namespace: merge existing PolicyMaps.
it_this->second->MergeFrom(*it_other->second);
++it_this;
++it_other;
} else if (it_this->first < it_other->first) {
// |this| has a PolicyMap that |other| doesn't; skip it.
++it_this;
} else if (it_other->first < it_this->first) {
// |other| has a PolicyMap that |this| doesn't; copy it.
policy_bundle_[it_other->first] = it_other->second->DeepCopy();
++it_other;
} else {
NOTREACHED();
}
}
// Add extra PolicyMaps at the end.
while (it_other != end_other) {
policy_bundle_[it_other->first] = it_other->second->DeepCopy();
++it_other;
}
}
bool PolicyBundle::Equals(const PolicyBundle& other) const {
// Equals() has the peculiarity that an entry with an empty PolicyMap equals
// an non-existent entry. This handles usage of non-const Get() that doesn't
// insert any policies.
auto it_this = begin();
auto it_other = other.begin();
while (true) {
// Skip empty PolicyMaps.
while (it_this != end() && it_this->second->empty())
++it_this;
while (it_other != other.end() && it_other->second->empty())
++it_other;
if (it_this == end() || it_other == other.end())
break;
if (it_this->first != it_other->first ||
!it_this->second->Equals(*it_other->second)) {
return false;
}
++it_this;
++it_other;
}
return it_this == end() && it_other == other.end();
}
void PolicyBundle::Clear() {
policy_bundle_.clear();
}
} // namespace policy