xapian-core/api/postlist.cc

   1 /** @file postlist.cc
   2  * @brief Abstract base class for postlists.
   3  */
   4 /* Copyright (C) 2007,2009,2011,2015,2017 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 #include <config.h>
  22
  23 #include "postlist.h"
  24
  25 #include <xapian/error.h>
  26
  27 #include "omassert.h"
  28
  29 using namespace std;
  30
  31 PostList::~PostList() {}
  32
  33 TermFreqs
  34 PostList::get_termfreq_est_using_stats(const Xapian::Weight::Internal &) const
  35 {
  36     throw Xapian::InvalidOperationError(
  37      "get_termfreq_est_using_stats() not meaningful for this PostingIterator");
  38 }
  39
  40 Xapian::termcount
  41 PostList::get_doclength() const
  42 {
  43     throw Xapian::InvalidOperationError("get_doclength() not meaningful for this PostingIterator");
  44 }
  45
  46 Xapian::termcount
  47 PostList::get_unique_terms() const
  48 {
  49     throw Xapian::InvalidOperationError("get_unique_terms() not meaningful for this PostingIterator");
  50 }
  51
  52 Xapian::termcount
  53 PostList::get_wdf() const
  54 {
  55     throw Xapian::InvalidOperationError("get_wdf() not meaningful for this PostingIterator");
  56 }
  57
  58 PositionList *
  59 PostList::read_position_list()
  60 {
  61     throw Xapian::UnimplementedError("OP_NEAR and OP_PHRASE only currently support leaf subqueries");
  62 }
  63
  64 PositionList *
  65 PostList::open_position_list() const
  66 {
  67     throw Xapian::InvalidOperationError("open_position_list() not meaningful for this PostingIterator");
  68 }
  69
  70 PostList *
  71 PostList::check(Xapian::docid did, double w_min, bool &valid)
  72 {
  73     valid = true;
  74     return skip_to(did, w_min);
  75 }
  76
  77 Xapian::termcount
  78 PostList::count_matching_subqs() const
  79 {
  80     Assert(false);
  81     return 0;
  82 }
  83
  84 void
  85 PostList::gather_position_lists(OrPositionList*)
  86 {
  87     Assert(false);
  88 }