1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "components/policy/core/common/policy_service.h"
6
7#include "base/values.h"
8
9namespace policy {
10
11PolicyChangeRegistrar::PolicyChangeRegistrar(PolicyService* policy_service,
12                                             const PolicyNamespace& ns)
13    : policy_service_(policy_service),
14      ns_(ns) {}
15
16PolicyChangeRegistrar::~PolicyChangeRegistrar() {
17  if (!callback_map_.empty())
18    policy_service_->RemoveObserver(ns_.domain, this);
19}
20
21void PolicyChangeRegistrar::Observe(const std::string& policy_name,
22                                    const UpdateCallback& callback) {
23  if (callback_map_.empty())
24    policy_service_->AddObserver(ns_.domain, this);
25  callback_map_[policy_name] = callback;
26}
27
28void PolicyChangeRegistrar::OnPolicyUpdated(const PolicyNamespace& ns,
29                                            const PolicyMap& previous,
30                                            const PolicyMap& current) {
31  if (ns != ns_)
32    return;
33  for (CallbackMap::iterator it = callback_map_.begin();
34       it != callback_map_.end(); ++it) {
35    const base::Value* prev = previous.GetValue(it->first);
36    const base::Value* cur = current.GetValue(it->first);
37    if (!base::Value::Equals(prev, cur))
38      it->second.Run(prev, cur);
39  }
40}
41
42}  // namespace policy
43