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/** @file chert_metadata.cc
* @brief Access to metadata for a chert database.
*/
/* Copyright (C) 2004,2005,2006,2007,2008,2011 Olly Betts
* Copyright (C) 2008 Lemur Consulting Ltd
*
* 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 "chert_metadata.h"
#include "backends/database.h"
#include "debuglog.h"
#include "omassert.h"
#include "stringutils.h"
using namespace std;
using Xapian::Internal::intrusive_ptr;
ChertMetadataTermList::ChertMetadataTermList(
intrusive_ptr<const Xapian::Database::Internal> database_,
ChertCursor * cursor_,
const string &prefix_)
: database(database_), cursor(cursor_), prefix(string("\x00\xc0", 2) + prefix_)
{
LOGCALL_CTOR(DB, "ChertMetadataTermList", database_ | cursor_ | prefix_);
Assert(cursor);
// Seek to the first key before the first metadata key.
cursor->find_entry_lt(prefix);
}
ChertMetadataTermList::~ChertMetadataTermList()
{
LOGCALL_DTOR(DB, "ChertMetadataTermList");
delete cursor;
}
string
ChertMetadataTermList::get_termname() const
{
LOGCALL(DB, string, "ChertMetadataTermList::get_termname", NO_ARGS);
Assert(!at_end());
Assert(!cursor->current_key.empty());
Assert(startswith(cursor->current_key, prefix));
RETURN(cursor->current_key.substr(2));
}
Xapian::doccount
ChertMetadataTermList::get_termfreq() const
{
throw Xapian::InvalidOperationError("ChertMetadataTermList::get_termfreq() not meaningful");
}
Xapian::termcount
ChertMetadataTermList::get_collection_freq() const
{
throw Xapian::InvalidOperationError("ChertMetadataTermList::get_collection_freq() not meaningful");
}
TermList *
ChertMetadataTermList::next()
{
LOGCALL(DB, TermList *, "ChertMetadataTermList::next", NO_ARGS);
Assert(!at_end());
cursor->next();
if (!cursor->after_end() && !startswith(cursor->current_key, prefix)) {
// We've reached the end of the prefixed terms.
cursor->to_end();
}
RETURN(NULL);
}
TermList *
ChertMetadataTermList::skip_to(const string &key)
{
LOGCALL(DB, TermList *, "ChertMetadataTermList::skip_to", key);
Assert(!at_end());
if (!cursor->find_entry_ge(string("\x00\xc0", 2) + key)) {
// The exact term we asked for isn't there, so check if the next
// term after it also has the right prefix.
if (!cursor->after_end() && !startswith(cursor->current_key, prefix)) {
// We've reached the end of the prefixed terms.
cursor->to_end();
}
}
RETURN(NULL);
}
bool
ChertMetadataTermList::at_end() const
{
LOGCALL(DB, bool, "ChertMetadataTermList::at_end", NO_ARGS);
RETURN(cursor->after_end());
}
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