xapian-core/api/documenttermlist.cc

   1 /** @file documenttermlist.cc
   2  * @brief Iteration over terms in a document
   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 #include <config.h>
  22
  23 #include "documenttermlist.h"
  24
  25 #include "backends/inmemory/inmemory_positionlist.h"
  26 #include "omassert.h"
  27
  28 #include "xapian/error.h"
  29
  30 using namespace std;
  31
  32 Xapian::termcount
  33 DocumentTermList::get_approx_size() const
  34 {
  35     // DocumentTermList is only used in a TermIterator wrapper and that never
  36     // calls this method.
  37     Assert(false);
  38     return 0;
  39 }
  40
  41 string
  42 DocumentTermList::get_termname() const
  43 {
  44     Assert(!at_end());
  45     return it->first;
  46 }
  47
  48 Xapian::termcount
  49 DocumentTermList::get_wdf() const
  50 {
  51     Assert(!at_end());
  52     return it->second.get_wdf();
  53 }
  54
  55 Xapian::doccount
  56 DocumentTermList::get_termfreq() const
  57 {
  58     throw Xapian::InvalidOperationError("get_termfreq() not valid for a TermIterator from a Document which is not associated with a database");
  59 }
  60
  61 const Xapian::VecCOW<Xapian::termpos>*
  62 DocumentTermList::get_vec_termpos() const
  63 {
  64     return it->second.get_positions();
  65 }
  66
  67 PositionList*
  68 DocumentTermList::positionlist_begin() const
  69 {
  70     return new InMemoryPositionList(*it->second.get_positions());
  71 }
  72
  73 Xapian::termcount
  74 DocumentTermList::positionlist_count() const
  75 {
  76     return it->second.get_positions()->size();
  77 }
  78
  79 TermList*
  80 DocumentTermList::next()
  81 {
  82     if (it == doc->terms->end()) {
  83         it = doc->terms->begin();
  84     } else {
  85         ++it;
  86     }
  87     while (it != doc->terms->end() && it->second.is_deleted()) {
  88         ++it;
  89     }
  90     return NULL;
  91 }
  92
  93 TermList*
  94 DocumentTermList::skip_to(const string& term)
  95 {
  96     it = doc->terms->lower_bound(term);
  97     while (it != doc->terms->end() && it->second.is_deleted()) {
  98         ++it;
  99     }
 100     return NULL;
 101 }
 102
 103 bool
 104 DocumentTermList::at_end() const
 105 {
 106     return it == doc->terms->end();
 107 }