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/** @file flint_alldocspostlist.cc
* @brief A PostList which iterates over all documents in a FlintDatabase.
*/
/* Copyright (C) 2006,2007,2008,2009 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "flint_alldocspostlist.h"
#include <string>
#include "debuglog.h"
#include "flint_database.h"
#include "str.h"
using namespace std;
Xapian::doccount
FlintAllDocsPostList::get_termfreq() const
{
return doccount;
}
Xapian::docid
FlintAllDocsPostList::get_docid() const
{
return current_did;
}
Xapian::termcount
FlintAllDocsPostList::get_doclength() const
{
LOGCALL(DB, Xapian::termcount, "FlintAllDocsPostList::get_doclength", NO_ARGS);
Assert(current_did);
cursor->read_tag();
if (cursor->current_tag.empty()) RETURN(0);
const char * pos = cursor->current_tag.data();
const char * end = pos + cursor->current_tag.size();
flint_doclen_t doclen;
if (!F_unpack_uint(&pos, end, &doclen)) {
const char *msg;
if (pos == 0) {
msg = "Too little data for doclen in termlist";
} else {
msg = "Overflowed value for doclen in termlist";
}
throw Xapian::DatabaseCorruptError(msg);
}
RETURN(doclen);
}
Xapian::termcount
FlintAllDocsPostList::get_wdf() const
{
LOGCALL(DB, Xapian::termcount, "FlintAllDocsPostList::get_wdf", NO_ARGS);
Assert(current_did);
RETURN(1);
}
PostList *
FlintAllDocsPostList::read_did_from_current_key()
{
LOGCALL(DB, PostList *, "FlintAllDocsPostList::read_did_from_current_key", NO_ARGS);
const string & key = cursor->current_key;
const char * pos = key.data();
const char * end = pos + key.size();
if (!F_unpack_uint_preserving_sort(&pos, end, ¤t_did)) {
const char *msg;
if (pos == 0) {
msg = "Too little data in termlist key";
} else {
msg = "Overflowed value in termlist key";
}
throw Xapian::DatabaseCorruptError(msg);
}
// Return NULL to help the compiler tail-call optimise our callers.
RETURN(NULL);
}
PostList *
FlintAllDocsPostList::next(Xapian::weight /*w_min*/)
{
LOGCALL(DB, PostList *, "FlintAllDocsPostList::next", Literal("/*w_min*/"));
Assert(!at_end());
if (!cursor->next()) RETURN(NULL);
RETURN(read_did_from_current_key());
}
PostList *
FlintAllDocsPostList::skip_to(Xapian::docid did, Xapian::weight /*w_min*/)
{
LOGCALL(DB, PostList *, "FlintAllDocsPostList::skip_to", did | Literal("/*w_min*/"));
if (did <= current_did || at_end()) RETURN(NULL);
if (cursor->find_entry_ge(F_pack_uint_preserving_sort(did))) {
// The exact docid that was asked for exists.
current_did = did;
RETURN(NULL);
}
if (cursor->after_end()) RETURN(NULL);
RETURN(read_did_from_current_key());
}
bool
FlintAllDocsPostList::at_end() const {
LOGCALL(DB, bool, "FlintAllDocsPostList::at_end", NO_ARGS);
RETURN(cursor->after_end());
}
string
FlintAllDocsPostList::get_description() const
{
string desc = "FlintAllDocsPostList(did=";
desc += str(current_did);
desc += ",doccount=";
desc += str(doccount);
desc += ')';
return desc;
}
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