xapian-core/api/vectortermlist.cc

   1 /** @file
   2  * @brief A vector-like container of terms which can be iterated.
   3  */
   4 /* Copyright (C) 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 "vectortermlist.h"
  24
  25 #include "net/length.h"
  26 #include "omassert.h"
  27 #include "xapian/error.h"
  28
  29 using namespace std;
  30
  31 Xapian::termcount
  32 VectorTermList::get_approx_size() const
  33 {
  34     return num_terms;
  35 }
  36
  37 string
  38 VectorTermList::get_termname() const
  39 {
  40     // Check we've started but not reached the end.
  41     Assert(p != data.data());
  42     Assert(!VectorTermList::at_end());
  43     return current_term;
  44 }
  45
  46 Xapian::termcount
  47 VectorTermList::get_wdf() const
  48 {
  49     // Check we've started but not reached the end.
  50     Assert(p != data.data());
  51     Assert(!VectorTermList::at_end());
  52     return 1;
  53 }
  54
  55 Xapian::doccount
  56 VectorTermList::get_termfreq() const
  57 {
  58     throw Xapian::InvalidOperationError("VectorTermList::get_termfreq() not meaningful");
  59 }
  60
  61 TermList *
  62 VectorTermList::next()
  63 {
  64     // Check we've not reached the end.
  65     Assert(!VectorTermList::at_end());
  66
  67     const char * end = data.data() + data.size();
  68     if (p == end) {
  69         current_term.resize(0);
  70         p = NULL;
  71     } else {
  72         size_t len;
  73         decode_length_and_check(&p, end, len);
  74         current_term.assign(p, len);
  75         p += len;
  76     }
  77
  78     return NULL;
  79 }
  80
  81 TermList *
  82 VectorTermList::skip_to(const string &)
  83 {
  84     // skip_to only makes sense for termlists which are in sorted order.
  85     throw Xapian::InvalidOperationError("VectorTermList::skip_to() not meaningful");
  86 }
  87
  88 bool
  89 VectorTermList::at_end() const
  90 {
  91     return p == NULL;
  92 }
  93
  94 Xapian::termcount
  95 VectorTermList::positionlist_count() const
  96 {
  97     throw Xapian::InvalidOperationError("VectorTermList::positionlist_count() not meaningful");
  98 }
  99
 100 Xapian::PositionIterator
 101 VectorTermList::positionlist_begin() const
 102 {
 103     throw Xapian::InvalidOperationError("VectorTermList::positionlist_begin() not meaningful");
 104 }