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/* glass_termlist.cc: Termlists in a glass database
*
* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2002 Ananova Ltd
* Copyright 2002,2003,2004,2006,2007,2008,2009,2010,2014 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 "glass_termlist.h"
#include "xapian/error.h"
#include "expand/expandweight.h"
#include "glass_positionlist.h"
#include "debuglog.h"
#include "omassert.h"
#include "pack.h"
#include "str.h"
using namespace std;
using Xapian::Internal::intrusive_ptr;
GlassTermList::GlassTermList(intrusive_ptr<const GlassDatabase> db_,
Xapian::docid did_)
: db(db_), did(did_), current_wdf(0), current_termfreq(0)
{
LOGCALL_CTOR(DB, "GlassTermList", db_ | did_);
if (!db->termlist_table.get_exact_entry(GlassTermListTable::make_key(did),
data))
throw Xapian::DocNotFoundError("No termlist for document " + str(did));
pos = data.data();
end = pos + data.size();
if (pos == end) {
doclen = 0;
termlist_size = 0;
return;
}
// Read doclen
if (!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);
}
// Read termlist_size
if (!unpack_uint(&pos, end, &termlist_size)) {
const char *msg;
if (pos == 0) {
msg = "Too little data for list size in termlist";
} else {
msg = "Overflowed value for list size in termlist";
}
throw Xapian::DatabaseCorruptError(msg);
}
}
Xapian::termcount
GlassTermList::get_doclength() const
{
LOGCALL(DB, Xapian::termcount, "GlassTermList::get_doclength", NO_ARGS);
RETURN(doclen);
}
Xapian::termcount
GlassTermList::get_approx_size() const
{
LOGCALL(DB, Xapian::termcount, "GlassTermList::get_approx_size", NO_ARGS);
RETURN(termlist_size);
}
void
GlassTermList::accumulate_stats(Xapian::Internal::ExpandStats & stats) const
{
LOGCALL_VOID(DB, "GlassTermList::accumulate_stats", stats);
Assert(!at_end());
stats.accumulate(current_wdf, doclen, get_termfreq(), db->get_doccount());
}
string
GlassTermList::get_termname() const
{
LOGCALL(DB, string, "GlassTermList::get_termname", NO_ARGS);
RETURN(current_term);
}
Xapian::termcount
GlassTermList::get_wdf() const
{
LOGCALL(DB, Xapian::termcount, "GlassTermList::get_wdf", NO_ARGS);
RETURN(current_wdf);
}
Xapian::doccount
GlassTermList::get_termfreq() const
{
LOGCALL(DB, Xapian::doccount, "GlassTermList::get_termfreq", NO_ARGS);
if (current_termfreq == 0)
db->get_freqs(current_term, ¤t_termfreq, NULL);
RETURN(current_termfreq);
}
TermList *
GlassTermList::next()
{
LOGCALL(DB, TermList *, "GlassTermList::next", NO_ARGS);
Assert(!at_end());
if (pos == end) {
pos = NULL;
RETURN(NULL);
}
// Reset to 0 to indicate that the termfreq needs to be read.
current_termfreq = 0;
bool wdf_in_reuse = false;
if (!current_term.empty()) {
// Find out how much of the previous term to reuse.
size_t len = static_cast<unsigned char>(*pos++);
if (len > current_term.size()) {
// The wdf is also stored in the "reuse" byte.
wdf_in_reuse = true;
size_t divisor = current_term.size() + 1;
current_wdf = len / divisor - 1;
len %= divisor;
}
current_term.resize(len);
}
// Append the new tail to form the next term.
size_t append_len = static_cast<unsigned char>(*pos++);
current_term.append(pos, append_len);
pos += append_len;
// Read the wdf if it wasn't packed into the reuse byte.
if (!wdf_in_reuse && !unpack_uint(&pos, end, ¤t_wdf)) {
const char *msg;
if (pos == 0) {
msg = "Too little data for wdf in termlist";
} else {
msg = "Overflowed value for wdf in termlist";
}
throw Xapian::DatabaseCorruptError(msg);
}
RETURN(NULL);
}
TermList *
GlassTermList::skip_to(const string & term)
{
LOGCALL(API, TermList *, "GlassTermList::skip_to", term);
while (pos != NULL && current_term < term) {
(void)GlassTermList::next();
}
RETURN(NULL);
}
bool
GlassTermList::at_end() const
{
LOGCALL(DB, bool, "GlassTermList::at_end", NO_ARGS);
RETURN(pos == NULL);
}
Xapian::termcount
GlassTermList::positionlist_count() const
{
LOGCALL(DB, Xapian::termcount, "GlassTermList::positionlist_count", NO_ARGS);
RETURN(db->position_table.positionlist_count(did, current_term));
}
Xapian::PositionIterator
GlassTermList::positionlist_begin() const
{
LOGCALL(DB, Xapian::PositionIterator, "GlassTermList::positionlist_begin", NO_ARGS);
RETURN(Xapian::PositionIterator(
new GlassPositionList(&db->position_table, did, current_term)));
}
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