common/ortermlist.h

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00001 
00004 /* Copyright (C) 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 USA
00019  */
00020 
00021 #ifndef XAPIAN_INCLUDED_ORTERMLIST_H
00022 #define XAPIAN_INCLUDED_ORTERMLIST_H
00023 
00024 #include "termlist.h"
00025 
00026 namespace Xapian {
00027 namespace Internal {
00028 class ExpandStats;
00029 }
00030 }
00031 
00032 class OrTermList : public TermList {
00033   protected:
00035     TermList *left, *right;
00036 
00043     std::string left_current, right_current;
00044 
00046     void check_started() const;
00047 
00048   public:
00049     OrTermList(TermList * left_, TermList * right_)
00050         : left(left_), right(right_) { }
00051 
00052     ~OrTermList();
00053 
00054     Xapian::termcount get_approx_size() const;
00055 
00056     void accumulate_stats(Xapian::Internal::ExpandStats & stats) const;
00057 
00058     std::string get_termname() const;
00059 
00060     Xapian::termcount get_wdf() const;
00061 
00062     Xapian::doccount get_termfreq() const;
00063 
00064 #if 0 // This method isn't actually used anywhere currently.
00065     Xapian::termcount get_collection_freq() const;
00066 #endif
00067 
00068     TermList *next();
00069 
00070     bool at_end() const;
00071 
00072     Xapian::termcount positionlist_count() const;
00073 
00074     Xapian::PositionIterator positionlist_begin() const;
00075 };
00076 
00083 class FreqAdderOrTermList : public OrTermList {
00084     public:
00085         FreqAdderOrTermList(TermList * left_, TermList * right_)
00086                 : OrTermList(left_, right_)
00087         { }
00088 
00089         Xapian::doccount get_termfreq() const;
00090 };
00091 
00092 #endif // XAPIAN_INCLUDED_ORTERMLIST_H

Documentation for Xapian (version 1.0.10).
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