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       1                 :            : /** @file wrapperpostlist.h
       2                 :            :  * @brief Base class for a PostList which wraps another PostList
       3                 :            :  */
       4                 :            : /* Copyright 2017 Olly Betts
       5                 :            :  *
       6                 :            :  * This program is free software; you can redistribute it and/or
       7                 :            :  * modify it under the terms of the GNU General Public License as
       8                 :            :  * published by the Free Software Foundation; either version 2 of the
       9                 :            :  * License, or (at your option) any later version.
      10                 :            :  *
      11                 :            :  * This program is distributed in the hope that it will be useful,
      12                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 :            :  * GNU General Public License for more details.
      15                 :            :  *
      16                 :            :  * You should have received a copy of the GNU General Public License
      17                 :            :  * along with this program; if not, write to the Free Software
      18                 :            :  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
      19                 :            :  */
      20                 :            : 
      21                 :            : #ifndef XAPIAN_INCLUDED_WRAPPERPOSTLIST_H
      22                 :            : #define XAPIAN_INCLUDED_WRAPPERPOSTLIST_H
      23                 :            : 
      24                 :            : #include "api/postlist.h"
      25                 :            : 
      26                 :            : /** Base class for a PostList which wraps another PostList.
      27                 :            :  *
      28                 :            :  *  Generally methods are just forwarded to the wrapped PostList.  For next()
      29                 :            :  *  and skip_to(), the return value is also handled, so the wrapped PostList
      30                 :            :  *  is updated when pruning happens.
      31                 :            :  */
      32                 :            : class WrapperPostList : public PostList {
      33                 :            :     /// Don't allow assignment.
      34                 :            :     void operator=(const WrapperPostList&) = delete;
      35                 :            : 
      36                 :            :     /// Don't allow copying.
      37                 :            :     WrapperPostList(const WrapperPostList&) = delete;
      38                 :            : 
      39                 :            :   protected:
      40                 :            :     PostList* pl;
      41                 :            : 
      42                 :            :   public:
      43                 :       6712 :     explicit WrapperPostList(PostList* pl_) : pl(pl_) {}
      44                 :            : 
      45 [ +  + ][ -  + ]:       6712 :     ~WrapperPostList() { delete pl; }
      46                 :            : 
      47                 :            :     Xapian::doccount get_termfreq_min() const;
      48                 :            : 
      49                 :            :     Xapian::doccount get_termfreq_max() const;
      50                 :            : 
      51                 :            :     Xapian::doccount get_termfreq_est() const;
      52                 :            : 
      53                 :            :     TermFreqs get_termfreq_est_using_stats(
      54                 :            :             const Xapian::Weight::Internal& stats) const;
      55                 :            : 
      56                 :            :     Xapian::docid get_docid() const;
      57                 :            : 
      58                 :            :     double get_weight(Xapian::termcount doclen,
      59                 :            :                       Xapian::termcount unique_terms) const;
      60                 :            : 
      61                 :            :     bool at_end() const;
      62                 :            : 
      63                 :            :     double recalc_maxweight();
      64                 :            : 
      65                 :            :     PositionList* read_position_list();
      66                 :            : 
      67                 :            :     PostList* next(double w_min);
      68                 :            : 
      69                 :            :     PostList* skip_to(Xapian::docid, double w_min);
      70                 :            : 
      71                 :            :     std::string get_description() const;
      72                 :            : 
      73                 :            :     Xapian::termcount get_wdf() const;
      74                 :            : 
      75                 :            :     Xapian::termcount count_matching_subqs() const;
      76                 :            : };
      77                 :            : 
      78                 :            : #endif // XAPIAN_INCLUDED_WRAPPERPOSTLIST_H