xapian-core/weight/coordweight.cc

   1 /** @file
   2  * @brief Xapian::CoordWeight class - coordinate matching
   3  */
   4 /* Copyright (C) 2004,2009,2011,2016 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 "xapian/weight.h"
  24
  25 #include "xapian/error.h"
  26
  27 using namespace std;
  28
  29 namespace Xapian {
  30
  31 CoordWeight *
  32 CoordWeight::clone() const
  33 {
  34     return new CoordWeight;
  35 }
  36
  37 void
  38 CoordWeight::init(double factor_)
  39 {
  40     factor = factor_;
  41 }
  42
  43 string
  44 CoordWeight::name() const
  45 {
  46     return "Xapian::CoordWeight";
  47 }
  48
  49 string
  50 CoordWeight::short_name() const
  51 {
  52     return "coord";
  53 }
  54
  55 string
  56 CoordWeight::serialise() const
  57 {
  58     // No parameters to serialise.
  59     return string();
  60 }
  61
  62 CoordWeight *
  63 CoordWeight::unserialise(const string& s) const
  64 {
  65     if (rare(!s.empty()))
  66         throw Xapian::SerialisationError("Extra data in CoordWeight::unserialise()");
  67     return new CoordWeight;
  68 }
  69
  70 double
  71 CoordWeight::get_sumpart(Xapian::termcount, Xapian::termcount,
  72                          Xapian::termcount, Xapian::termcount) const
  73 {
  74     return factor;
  75 }
  76
  77 double
  78 CoordWeight::get_maxpart() const
  79 {
  80     return factor;
  81 }
  82
  83 CoordWeight *
  84 CoordWeight::create_from_parameters(const char * p) const
  85 {
  86     if (*p != '\0')
  87         throw InvalidArgumentError("No parameters are required for CoordWeight");
  88     return new Xapian::CoordWeight();
  89 }
  90
  91 }