xapian-core/api/postlist.cc

   1 /** @file postlist.cc
   2  * @brief Abstract base class for postlists.
   3  */
   4 /* Copyright (C) 2007,2009,2011,2015 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 namespace Xapian {
  32
  33 PostingIterator::Internal::~Internal() { }
  34
  35 TermFreqs
  36 PostingIterator::Internal::get_termfreq_est_using_stats(
  37         const Xapian::Weight::Internal &) const
  38 {
  39     throw Xapian::InvalidOperationError(
  40      "get_termfreq_est_using_stats() not meaningful for this PostingIterator");
  41 }
  42
  43 Xapian::termcount
  44 PostingIterator::Internal::get_wdf() const
  45 {
  46     throw Xapian::InvalidOperationError("get_wdf() not meaningful for this PostingIterator");
  47 }
  48
  49 const string *
  50 PostingIterator::Internal::get_sort_key() const
  51 {
  52     return NULL;
  53 }
  54
  55 const string *
  56 PostingIterator::Internal::get_collapse_key() const
  57 {
  58     return NULL;
  59 }
  60
  61 PositionList *
  62 PostList::read_position_list()
  63 {
  64     throw Xapian::UnimplementedError("OP_NEAR and OP_PHRASE only currently support terms as subqueries");
  65 }
  66
  67 PositionList *
  68 PostList::open_position_list() const
  69 {
  70     throw Xapian::InvalidOperationError("open_position_list() not meaningful for this PostingIterator");
  71 }
  72
  73 PostList *
  74 PostList::check(Xapian::docid did, double w_min, bool &valid)
  75 {
  76     valid = true;
  77     return skip_to(did, w_min);
  78 }
  79
  80 Xapian::termcount
  81 PostList::count_matching_subqs() const
  82 {
  83     Assert(false);
  84     return 0;
  85 }
  86
  87 }