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// 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 "components/policy/core/common/policy_service.h"
#include "base/values.h"
namespace policy {
PolicyChangeRegistrar::PolicyChangeRegistrar(PolicyService* policy_service,
const PolicyNamespace& ns)
: policy_service_(policy_service),
ns_(ns) {}
PolicyChangeRegistrar::~PolicyChangeRegistrar() {
if (!callback_map_.empty())
policy_service_->RemoveObserver(ns_.domain, this);
}
void PolicyChangeRegistrar::Observe(const std::string& policy_name,
const UpdateCallback& callback) {
if (callback_map_.empty())
policy_service_->AddObserver(ns_.domain, this);
callback_map_[policy_name] = callback;
}
void PolicyChangeRegistrar::OnPolicyUpdated(const PolicyNamespace& ns,
const PolicyMap& previous,
const PolicyMap& current) {
if (ns != ns_)
return;
for (CallbackMap::iterator it = callback_map_.begin();
it != callback_map_.end(); ++it) {
const base::Value* prev = previous.GetValue(it->first);
const base::Value* cur = current.GetValue(it->first);
// Check if the values pointed to by |prev| and |cur| are different.
if ((!prev ^ !cur) || (prev && cur && *prev != *cur))
it->second.Run(prev, cur);
}
}
} // namespace policy
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