components/policy/core/common/policy_service.cc

   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
  11 PolicyChangeRegistrar::PolicyChangeRegistrar(PolicyService* policy_service,
  12                                              const PolicyNamespace& ns)
  13     : policy_service_(policy_service),
  14       ns_(ns) {}
  15
  16 PolicyChangeRegistrar::~PolicyChangeRegistrar() {
  17   if (!callback_map_.empty())
  18     policy_service_->RemoveObserver(ns_.domain, this);
  19 }
  20
  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
  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     if (!base::Value::Equals(prev, cur))
  38       it->second.Run(prev, cur);
  39   }
  40 }
  41
  42 }  // namespace policy