Implement first version of OfflinePageSuggestionsProvider

chrome/browser/android/ntp/offline_page_suggestions_provider_factory.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 "chrome/browser/android/ntp/offline_page_suggestions_provider_factory.h"
+
+#include "base/feature_list.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/android/chrome_feature_list.h"
+#include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
+#include "chrome/browser/ntp_snippets/content_suggestions_service_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/pref_names.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "components/ntp_snippets/content_suggestions_service.h"
+#include "components/ntp_snippets/offline_pages/offline_page_suggestions_provider.h"
+#include "components/offline_pages/offline_page_model.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/browser_context.h"
+
+using ntp_snippets::ContentSuggestionsService;
+using ntp_snippets::OfflinePageSuggestionsProvider;
+using offline_pages::OfflinePageModel;
+using offline_pages::OfflinePageModelFactory;
+
+// static
+OfflinePageSuggestionsProviderFactory*
+OfflinePageSuggestionsProviderFactory::GetInstance() {
+  return base::Singleton<OfflinePageSuggestionsProviderFactory>::get();
+}
+
+// static
+ntp_snippets::OfflinePageSuggestionsProvider*
+OfflinePageSuggestionsProviderFactory::GetForProfile(Profile* profile) {
+  DCHECK(!profile->IsOffTheRecord());
+  return static_cast<ntp_snippets::OfflinePageSuggestionsProvider*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+OfflinePageSuggestionsProviderFactory::OfflinePageSuggestionsProviderFactory()
+    : BrowserContextKeyedServiceFactory(
+          "OfflinePageSuggestionsProvider",
+          BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(ContentSuggestionsServiceFactory::GetInstance());
+  DependsOn(OfflinePageModelFactory::GetInstance());
+}
+
+OfflinePageSuggestionsProviderFactory::
+    ~OfflinePageSuggestionsProviderFactory() {}
+
+KeyedService* OfflinePageSuggestionsProviderFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  Profile* profile = Profile::FromBrowserContext(context);
+
+  ContentSuggestionsService* content_suggestions_service =
+      ContentSuggestionsServiceFactory::GetForProfile(profile);
+  if (content_suggestions_service->state() ==
+      ContentSuggestionsService::State::DISABLED) {
+    return nullptr;
+  }
+
+  if (!base::FeatureList::IsEnabled(
+          chrome::android::kNTPOfflinePageSuggestionsFeature)) {
+    return nullptr;
+  }
+
+  OfflinePageModel* offline_page_model =
+      OfflinePageModelFactory::GetForBrowserContext(profile);
+
+  OfflinePageSuggestionsProvider* offline_page_suggestions_provider =
+      new OfflinePageSuggestionsProvider(offline_page_model);
+  content_suggestions_service->RegisterProvider(
+      offline_page_suggestions_provider);
+  return offline_page_suggestions_provider;
+}