00001 00004 /* Copyright (C) 2009 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_EMPTYPOSTLIST_H 00022 #define XAPIAN_INCLUDED_EMPTYPOSTLIST_H 00023 00024 #include "postlist.h" 00025 00027 class EmptyPostList : public PostList { 00029 void operator=(const EmptyPostList &); 00030 00032 EmptyPostList(const EmptyPostList &); 00033 00034 public: 00036 EmptyPostList() { } 00037 00038 Xapian::doccount get_termfreq_min() const; 00039 Xapian::doccount get_termfreq_max() const; 00040 Xapian::doccount get_termfreq_est() const; 00041 00042 Xapian::weight get_maxweight() const; 00043 Xapian::docid get_docid() const; 00044 Xapian::termcount get_doclength() const; 00045 Xapian::weight get_weight() const; 00046 bool at_end() const; 00047 Xapian::weight recalc_maxweight(); 00048 00049 PostList * next(Xapian::weight w_min); 00050 PostList * skip_to(Xapian::docid, Xapian::weight w_min); 00051 00052 std::string get_description() const; 00053 }; 00054 00055 #endif // XAPIAN_INCLUDED_EMPTYPOSTLIST_H