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      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 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
      7 
      8 #include <deque>
      9 
     10 #include "base/basictypes.h"
     11 #include "chrome/browser/common/cancelable_request.h"
     12 #include "chrome/browser/history/history_types.h"
     13 #include "chrome/browser/history/visit_filter.h"
     14 #include "chrome/browser/ui/webui/ntp/suggestions_source.h"
     15 
     16 class SuggestionsCombiner;
     17 class Profile;
     18 
     19 namespace base {
     20 class DictionaryValue;
     21 }
     22 
     23 // A SuggestionsSource that uses the local TopSites database to provide
     24 // suggestions.
     25 class SuggestionsSourceTopSites : public SuggestionsSource {
     26  public:
     27   SuggestionsSourceTopSites();
     28   virtual ~SuggestionsSourceTopSites();
     29 
     30  protected:
     31   // SuggestionsSource overrides:
     32   virtual void SetDebug(bool enable) OVERRIDE;
     33   virtual int GetWeight() OVERRIDE;
     34   virtual int GetItemCount() OVERRIDE;
     35   virtual base::DictionaryValue* PopItem() OVERRIDE;
     36   virtual void FetchItems(Profile* profile) OVERRIDE;
     37   virtual void SetCombiner(SuggestionsCombiner* combiner) OVERRIDE;
     38 
     39   void OnSuggestionsUrlsAvailable(
     40       CancelableRequestProvider::Handle handle,
     41       const history::FilteredURLList& data);
     42 
     43  private:
     44 
     45   // Gets the sorting order from the command-line arguments. Defaults to
     46   // |ORDER_BY_RECENCY| if there are no command-line argument specifying a
     47   // sorting order.
     48   static history::VisitFilter::SortingOrder GetSortingOrder();
     49 
     50   // Gets the filter width from the command-line arguments. Defaults to one
     51   // hour if there are no command-line argument setting the filter width.
     52   static base::TimeDelta GetFilterWidth();
     53 
     54   // Our combiner.
     55   SuggestionsCombiner* combiner_;
     56 
     57   // Keep the results of the db query here.
     58   std::deque<base::DictionaryValue*> items_;
     59 
     60   // Whether the source should provide additional debug information or not.
     61   bool debug_;
     62 
     63   CancelableRequestConsumer history_consumer_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceTopSites);
     66 };
     67 
     68 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
     69