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// Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
#include <deque>
#include "base/basictypes.h"
#include "base/task/cancelable_task_tracker.h"
#include "chrome/browser/ui/webui/ntp/suggestions_source.h"
#include "components/history/core/browser/history_types.h"
#include "components/history/core/browser/visit_filter.h"
class SuggestionsCombiner;
class Profile;
namespace base {
class DictionaryValue;
}
// A SuggestionsSource that uses the local TopSites database to provide
// suggestions.
class SuggestionsSourceTopSites : public SuggestionsSource {
public:
SuggestionsSourceTopSites();
~SuggestionsSourceTopSites() override;
protected:
// SuggestionsSource overrides:
void SetDebug(bool enable) override;
int GetWeight() override;
int GetItemCount() override;
base::DictionaryValue* PopItem() override;
void FetchItems(Profile* profile) override;
void SetCombiner(SuggestionsCombiner* combiner) override;
void OnSuggestionsUrlsAvailable(const history::FilteredURLList* data);
private:
// Gets the sorting order from the command-line arguments. Defaults to
// |ORDER_BY_RECENCY| if there are no command-line argument specifying a
// sorting order.
static history::VisitFilter::SortingOrder GetSortingOrder();
// Gets the filter width from the command-line arguments. Defaults to one
// hour if there are no command-line argument setting the filter width.
static base::TimeDelta GetFilterWidth();
// Our combiner.
SuggestionsCombiner* combiner_;
// Keep the results of the db query here.
std::deque<base::DictionaryValue*> items_;
// Whether the source should provide additional debug information or not.
bool debug_;
base::CancelableTaskTracker history_tracker_;
DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceTopSites);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
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