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/* flint_alltermslist.cc: A termlist containing all terms in a flint database.
*
* Copyright (C) 2005,2007 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_alltermslist.h"
#include "flint_postlist.h"
#include "flint_utils.h"
#include "stringutils.h"
void
FlintAllTermsList::read_termfreq_and_collfreq() const
{
DEBUGCALL(DB, void, "FlintAllTermsList::read_termfreq_and_collfreq", "");
Assert(!current_term.empty());
Assert(!at_end());
// Unpack the termfreq and collfreq from the tag. Only do this if
// one or other is actually read.
cursor->read_tag();
const char *p = cursor->current_tag.data();
const char *pend = p + cursor->current_tag.size();
FlintPostList::read_number_of_entries(&p, pend, &termfreq, &collfreq);
}
FlintAllTermsList::~FlintAllTermsList()
{
DEBUGCALL(DB, void, "~FlintAllTermsList", "");
delete cursor;
}
Xapian::termcount
FlintAllTermsList::get_approx_size() const
{
DEBUGCALL(DB, Xapian::termcount, "FlintAllTermsList::get_approx_size", "");
RETURN(approx_size);
}
string
FlintAllTermsList::get_termname() const
{
DEBUGCALL(DB, string, "FlintAllTermsList::get_termname", "");
Assert(!current_term.empty());
Assert(!at_end());
RETURN(current_term);
}
Xapian::doccount
FlintAllTermsList::get_termfreq() const
{
DEBUGCALL(DB, Xapian::doccount, "FlintAllTermsList::get_termfreq", "");
Assert(!current_term.empty());
Assert(!at_end());
if (termfreq == 0) read_termfreq_and_collfreq();
RETURN(termfreq);
}
Xapian::termcount
FlintAllTermsList::get_collection_freq() const
{
DEBUGCALL(DB, Xapian::termcount, "FlintAllTermsList::get_collection_freq", "");
Assert(!current_term.empty());
Assert(!at_end());
if (termfreq == 0) read_termfreq_and_collfreq();
RETURN(collfreq);
}
TermList *
FlintAllTermsList::next()
{
DEBUGCALL(DB, TermList *, "FlintAllTermsList::next", "");
Assert(!at_end());
// Set termfreq to 0 to indicate no termfreq/collfreq have been read for
// the current term.
termfreq = 0;
while (true) {
cursor->next();
if (cursor->after_end()) {
current_term = "";
break;
}
const char *p = cursor->current_key.data();
const char *pend = p + cursor->current_key.size();
if (!unpack_string_preserving_sort(&p, pend, current_term)) {
throw Xapian::DatabaseCorruptError("PostList table key has unexpected format");
}
if (!startswith(current_term, prefix)) {
// We've reached the end of the prefixed terms.
cursor->to_end();
current_term = "";
break;
}
// If this key is for the first chunk of a postlist, we're done.
// Otherwise we need to skip past continuation chunks until we find the
// first chunk of the next postlist.
if (p == pend) break;
}
RETURN(NULL);
}
TermList *
FlintAllTermsList::skip_to(const string &term)
{
DEBUGCALL(DB, TermList *, "FlintAllTermsList::skip_to", term);
Assert(!at_end());
// Set termfreq to 0 to indicate no termfreq/collfreq have been read for
// the current term.
termfreq = 0;
if (cursor->find_entry_ge(pack_string_preserving_sort(term))) {
// The exact term we asked for is there, so just copy it rather than
// wasting effort unpacking it from the key.
current_term = term;
} else {
if (cursor->after_end()) {
current_term = "";
RETURN(NULL);
}
const char *p = cursor->current_key.data();
const char *pend = p + cursor->current_key.size();
if (!unpack_string_preserving_sort(&p, pend, current_term)) {
throw Xapian::DatabaseCorruptError("PostList table key has unexpected format");
}
}
if (!startswith(current_term, prefix)) {
// We've reached the end of the prefixed terms.
cursor->to_end();
current_term = "";
}
RETURN(NULL);
}
bool
FlintAllTermsList::at_end() const
{
DEBUGCALL(DB, bool, "FlintAllTermsList::at_end", "");
RETURN(cursor->after_end());
}
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