00001 /* mergepostlist.h: merge postlists from different databases 00002 * 00003 * Copyright 1999,2000,2001 BrightStation PLC 00004 * Copyright 2002 Ananova Ltd 00005 * Copyright 2002,2003,2004,2005 Olly Betts 00006 * Copyright 2007 Lemur Consulting Ltd 00007 * 00008 * This program is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU General Public License as 00010 * published by the Free Software Foundation; either version 2 of the 00011 * License, or (at your option) any later version. 00012 * 00013 * This program is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00016 * GNU General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU General Public License 00019 * along with this program; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 00021 * USA 00022 */ 00023 00024 #ifndef OM_HGUARD_MERGEPOSTLIST_H 00025 #define OM_HGUARD_MERGEPOSTLIST_H 00026 00027 #include "postlist.h" 00028 00031 class MergePostList : public PostList { 00032 private: 00033 // Prevent copying 00034 MergePostList(const MergePostList &); 00035 MergePostList & operator=(const MergePostList &); 00036 00037 Xapian::weight w_max; 00038 00039 vector<PostList *> plists; 00040 00041 int current; 00042 00048 MultiMatch *matcher; 00049 00050 Xapian::ErrorHandler * errorhandler; 00051 public: 00052 Xapian::termcount get_wdf() const; 00053 Xapian::doccount get_termfreq_max() const; 00054 Xapian::doccount get_termfreq_min() const; 00055 Xapian::doccount get_termfreq_est() const; 00056 00057 Xapian::docid get_docid() const; 00058 Xapian::weight get_weight() const; 00059 const string * get_collapse_key() const; 00060 00061 Xapian::weight get_maxweight() const; 00062 00063 Xapian::weight recalc_maxweight(); 00064 00065 PostList *next(Xapian::weight w_min); 00066 PostList *skip_to(Xapian::docid did, Xapian::weight w_min); 00067 bool at_end() const; 00068 00069 string get_description() const; 00070 00074 virtual Xapian::doclength get_doclength() const; 00075 00076 MergePostList(vector<PostList *> plists_, 00077 MultiMatch *matcher, 00078 Xapian::ErrorHandler * errorhandler_); 00079 ~MergePostList(); 00080 }; 00081 00082 #endif /* OM_HGUARD_MERGEPOSTLIST_H */