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
9 namespace policy {
10
PolicyChangeRegistrar(PolicyService * policy_service,const PolicyNamespace & ns)11 PolicyChangeRegistrar::PolicyChangeRegistrar(PolicyService* policy_service,
12 const PolicyNamespace& ns)
13 : policy_service_(policy_service),
14 ns_(ns) {}
15
~PolicyChangeRegistrar()16 PolicyChangeRegistrar::~PolicyChangeRegistrar() {
17 if (!callback_map_.empty())
18 policy_service_->RemoveObserver(ns_.domain, this);
19 }
20
Observe(const std::string & policy_name,const UpdateCallback & callback)21 void 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
OnPolicyUpdated(const PolicyNamespace & ns,const PolicyMap & previous,const PolicyMap & current)28 void 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
38 // Check if the values pointed to by |prev| and |cur| are different.
39 if ((!prev ^ !cur) || (prev && cur && *prev != *cur))
40 it->second.Run(prev, cur);
41 }
42 }
43
44 } // namespace policy
45