Create ReadingListSuggestionsProvider

components/ntp_snippets/reading_list/reading_list_suggestions_provider.h

+// Copyright 2017 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.
+
+#ifndef COMPONENTS_NTP_SNIPPETS_READING_LIST_READING_LIST_SUGGESTIONS_PROVIDER_H_
+#define COMPONENTS_NTP_SNIPPETS_READING_LIST_READING_LIST_SUGGESTIONS_PROVIDER_H_
+
+#include <set>
+#include <string>
+
+#include "components/ntp_snippets/callbacks.h"
+#include "components/ntp_snippets/category.h"
+#include "components/ntp_snippets/category_info.h"
+#include "components/ntp_snippets/category_status.h"
+#include "components/ntp_snippets/content_suggestion.h"
+#include "components/ntp_snippets/content_suggestions_provider.h"
+#include "components/reading_list/core/reading_list_model_observer.h"
+
+class ReadingListModel;
+
+namespace ntp_snippets {
+
+// Provides content suggestions from the Reading List.
+class ReadingListSuggestionsProvider : public ContentSuggestionsProvider,
+                                       public ReadingListModelObserver {
+ public:
+  ReadingListSuggestionsProvider(ContentSuggestionsProvider::Observer* observer,
+                                 ReadingListModel* reading_list_model);
+  ~ReadingListSuggestionsProvider() override;
+
+  // ContentSuggestionsProvider implementation.
+  CategoryStatus GetCategoryStatus(Category category) override;
+  CategoryInfo GetCategoryInfo(Category category) override;
+  void DismissSuggestion(const ContentSuggestion::ID& suggestion_id) override;
+  void FetchSuggestionImage(const ContentSuggestion::ID& suggestion_id,
+                            const ImageFetchedCallback& callback) override;
+  void Fetch(const Category& category,
+             const std::set<std::string>& known_suggestion_ids,
+             const FetchDoneCallback& callback) override;
+  void ClearHistory(
+      base::Time begin,
+      base::Time end,
+      const base::Callback<bool(const GURL& url)>& filter) override;
+  void ClearCachedSuggestions(Category category) override;
+  void GetDismissedSuggestionsForDebugging(
+      Category category,
+      const DismissedSuggestionsCallback& callback) override;
+  void ClearDismissedSuggestionsForDebugging(Category category) override;
+
+  // ReadingListModelObserver implementation.
+  void ReadingListModelLoaded(const ReadingListModel* model) override;
+
+ private:
+  void FetchReadingListInternal();
+
+  CategoryStatus category_status_;
+  const Category provided_category_;
+
+  ReadingListModel* reading_list_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReadingListSuggestionsProvider);
+};
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_READING_LIST_READING_LIST_SUGGESTIONS_PROVIDER_H_