00001 /* multi_termlist.cc: C++ class definition for multiple database access 00002 * 00003 * Copyright 1999,2000,2001 BrightStation PLC 00004 * Copyright 2002,2003,2004,2005,2006,2007 Olly Betts 00005 * 00006 * This program is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU General Public License as 00008 * published by the Free Software Foundation; either version 2 of the 00009 * License, or (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 00019 * USA 00020 */ 00021 00022 #include <config.h> 00023 00024 #include "expandweight.h" 00025 #include "omdebug.h" 00026 #include "multi_termlist.h" 00027 #include "database.h" 00028 00029 MultiTermList::MultiTermList(TermList * tl_, 00030 const Xapian::Database &db_, 00031 size_t db_index_) 00032 : tl(tl_), db(db_), db_index(db_index_) 00033 { 00034 termfreq_factor = double(db.get_doccount()); 00035 termfreq_factor /= db.internal[db_index]->get_doccount(); 00036 DEBUGLINE(DB, "Approximation factor for termfreq: " << termfreq_factor); 00037 } 00038 00039 MultiTermList::~MultiTermList() 00040 { 00041 delete tl; 00042 } 00043 00044 Xapian::termcount 00045 MultiTermList::get_approx_size() const 00046 { 00047 return tl->get_approx_size(); 00048 } 00049 00050 void 00051 MultiTermList::accumulate_stats(Xapian::Internal::ExpandStats & stats) const 00052 { 00053 // For a multidb, every termlist access during expand will be through 00054 // a MultiTermList, so it's safe to just set db_index like this. 00055 stats.db_index = db_index; 00056 tl->accumulate_stats(stats); 00057 } 00058 00059 string 00060 MultiTermList::get_termname() const 00061 { 00062 return tl->get_termname(); 00063 } 00064 00065 Xapian::termcount MultiTermList::get_wdf() const 00066 { 00067 return tl->get_wdf(); 00068 } 00069 00070 Xapian::doccount MultiTermList::get_termfreq() const 00071 { 00072 // Approximate term frequency 00073 return Xapian::doccount(tl->get_termfreq() * termfreq_factor); 00074 } 00075 00076 TermList * MultiTermList::next() 00077 { 00078 return tl->next(); 00079 } 00080 00081 bool MultiTermList::at_end() const 00082 { 00083 return tl->at_end(); 00084 } 00085 00086 Xapian::termpos 00087 MultiTermList::positionlist_count() const 00088 { 00089 return tl->positionlist_count(); 00090 } 00091 00092 Xapian::PositionIterator 00093 MultiTermList::positionlist_begin() const 00094 { 00095 return tl->positionlist_begin(); 00096 }