Implementing client policy and controller.

components/offline_pages/client_policy_controller.cc

+// Copyright 2016 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/offline_pages/client_policy_controller.h"
+
+#include <utility>
+
+#include "base/logging.h"
+#include "base/time/time.h"
+
+using LifetimeType = offline_pages::LifetimePolicy::LifetimeType;
+
+namespace offline_pages {
+
+ClientPolicyController* ClientPolicyController::controller_ = nullptr;
+
+ClientPolicyController::ClientPolicyController() {
+  policies_.clear();
+// TODO(romax) Make here somehow more clever.

[fgorski, 2016/05/02 23:10:31]

Don't! Make it as clear as you can.

[romax, 2016/05/03 00:29:24]

Done.

+// Using macros to insert predefined client policies in client_policies.h.

[fgorski, 2016/05/02 23:10:31]

Don't. Code it by hand, it will be replaced by experiment, and if not, you still
benefit from not having a macro.

[romax, 2016/05/03 00:29:24]

Done.

+#undef POLICY
+#define POLICY(name_space, type, expire, limit)                \
+  policies_.insert(std::make_pair(                             \
+      #name_space, MakePolicy(#name_space, LifetimeType::type, \
+                              base::TimeDelta::FromDays(expire), limit)));
+
+#include "components/offline_pages/client_policies.h"
+  CLIENT_POLICIES
+#undef POLICY
+#undef CLIENT_POLICIES
+}
+
+ClientPolicyController::~ClientPolicyController() {}
+
+// static
+ClientPolicyController* ClientPolicyController::GetInstance() {
+  return controller_ ? controller_
+                     : base::Singleton<ClientPolicyController>::get();
+}
+
+// static
+const OfflinePageClientPolicy ClientPolicyController::MakePolicy(
+    const std::string& name_space,
+    LifetimeType lifetime_type,
+    const base::TimeDelta& expire_period,
+    int page_limit) {
+  OfflinePageClientPolicy policy(
+      {name_space, {lifetime_type, expire_period, page_limit}});
+  return policy;
+}
+
+const OfflinePageClientPolicy& ClientPolicyController::GetPolicy(
+    const std::string& name_space) {
+  const auto& iter = policies_.find(name_space);
+  if (iter != policies_.end())
+    return iter->second;
+  // Fallback when the namespace isn't defined.
+  return policies_.at(kDefaultPolicy);
+}
+
+}  // namespace offline_pages