00001 /* andnotpostlist.h: Return items which are in A, unless they're in B 00002 * 00003 * ----START-LICENCE---- 00004 * Copyright 1999,2000,2001 BrightStation PLC 00005 * Copyright 2002 Ananova Ltd 00006 * Copyright 2003,2004 Olly Betts 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 00021 * USA 00022 * -----END-LICENCE----- 00023 */ 00024 00025 #ifndef OM_HGUARD_ANDNOTPOSTLIST_H 00026 #define OM_HGUARD_ANDNOTPOSTLIST_H 00027 00028 #include "branchpostlist.h" 00029 00035 class AndNotPostList : public BranchPostList { 00036 private: 00037 Xapian::docid lhead, rhead; 00038 00040 Xapian::doccount dbsize; 00041 00042 PostList *advance_to_next_match(Xapian::weight w_min, PostList *ret); 00043 public: 00044 Xapian::doccount get_termfreq_max() const; 00045 Xapian::doccount get_termfreq_min() const; 00046 Xapian::doccount get_termfreq_est() const; 00047 00048 Xapian::docid get_docid() const; 00049 Xapian::weight get_weight() const; 00050 Xapian::weight get_maxweight() const; 00051 00052 Xapian::weight recalc_maxweight(); 00053 00054 PostList *next(Xapian::weight w_min); 00055 PostList *skip_to(Xapian::docid did, Xapian::weight w_min); 00056 bool at_end() const; 00057 00058 std::string get_description() const; 00059 00063 virtual Xapian::doclength get_doclength() const; 00064 00065 AndNotPostList(PostList *left, 00066 PostList *right, 00067 MultiMatch *matcher_, 00068 Xapian::doccount dbsize_); 00069 00070 PostList *sync_and_skip_to(Xapian::docid id, 00071 Xapian::weight w_min, 00072 Xapian::docid lh, 00073 Xapian::docid rh); 00074 }; 00075 00076 #endif /* OM_HGUARD_ANDNOTPOSTLIST_H */