Xapian: Internal Source Documentation: xapian-core: matcher/selectpostlist.cc Source File

00001 /* selectpostlist.cc: Parent class for classes which only return selected docs
00002  *
00003  * Copyright 1999,2000,2001 BrightStation PLC
00004  * Copyright 2002 Ananova Ltd
00005  * Copyright 2003,2004,2007,2010 Olly Betts
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License as
00009  * published by the Free Software Foundation; either version 2 of the
00010  * License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
00020  * USA
00021  */
00022 
00023 #include <config.h>
00024 #include "selectpostlist.h"
00025 
00026 #include "debuglog.h"
00027 #include "omassert.h"
00028 
00029 PostList *
00030 SelectPostList::next(Xapian::weight w_min)
00031 {
00032     LOGCALL(MATCH, PostList *, "SelectPostList::next", w_min);
00033     do {
00034         PostList *p = source->next(w_min);
00035         (void)p;
00036         Assert(p == NULL); // AND should never prune
00037     } while (!source->at_end() && !test_doc());
00038     RETURN(NULL);
00039 }
00040 
00041 PostList *
00042 SelectPostList::skip_to(Xapian::docid did, Xapian::weight w_min)
00043 {
00044     LOGCALL(MATCH, PostList *, "SelectPostList::skip_to", did | w_min);
00045     if (did > get_docid()) {
00046         PostList *p = source->skip_to(did, w_min);
00047         (void)p;
00048         Assert(p == NULL); // AND should never prune
00049         if (!source->at_end() && !test_doc())
00050             RETURN(SelectPostList::next(w_min));
00051     }
00052     RETURN(NULL);
00053 }
00054 
00055 PostList *
00056 SelectPostList::check(Xapian::docid did, Xapian::weight w_min, bool &valid)
00057 {
00058     LOGCALL(MATCH, PostList *, "SelectPostList::check", did | w_min | valid);
00059     PostList *p = source->check(did, w_min, valid);
00060     (void)p;
00061     Assert(p == NULL); // AND should never prune
00062     if (valid && !source->at_end() && !test_doc())
00063         valid = false;
00064     RETURN(NULL);
00065 }