backends/chert/chert_spellingwordslist.cc

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/* Copyright (C) 2004,2005,2006,2007,2008 Olly Betts
 * Copyright (C) 2007 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_spellingwordslist.h"

#include "xapian/error.h"
#include "xapian/types.h"

#include "debuglog.h"
#include "pack.h"
#include "stringutils.h"

ChertSpellingWordsList::~ChertSpellingWordsList()
{
    LOGCALL_DTOR(DB, "ChertSpellingWordsList");
    delete cursor;
}

string
ChertSpellingWordsList::get_termname() const
{
    LOGCALL(DB, string, "ChertSpellingWordsList::get_termname", NO_ARGS);
    Assert(cursor);
    Assert(!at_end());
    Assert(!cursor->current_key.empty());
    Assert(cursor->current_key[0] == 'W');
    RETURN(cursor->current_key.substr(1));
}

Xapian::doccount
ChertSpellingWordsList::get_termfreq() const
{
    LOGCALL(DB, string, "ChertSpellingWordsList::get_termfreq", NO_ARGS);
    Assert(cursor);
    Assert(!at_end());
    Assert(!cursor->current_key.empty());
    Assert(cursor->current_key[0] == 'W');
    cursor->read_tag();

    Xapian::termcount freq;
    const char *p = cursor->current_tag.data();
    if (!unpack_uint_last(&p, p + cursor->current_tag.size(), &freq)) {
        throw Xapian::DatabaseCorruptError("Bad spelling word freq");
    }
    return freq;
}

Xapian::termcount
ChertSpellingWordsList::get_collection_freq() const
{
    throw Xapian::InvalidOperationError("ChertSpellingWordsList::get_collection_freq() not meaningful");
}

TermList *
ChertSpellingWordsList::next()
{
    LOGCALL(DB, TermList *, "ChertSpellingWordsList::next", NO_ARGS);
    Assert(!at_end());

    cursor->next();
    if (!cursor->after_end() && !startswith(cursor->current_key, 'W')) {
        // We've reached the end of the prefixed terms.
        cursor->to_end();
    }

    RETURN(NULL);
}

TermList *
ChertSpellingWordsList::skip_to(const string &tname)
{
    LOGCALL(DB, TermList *, "ChertSpellingWordsList::skip_to", tname);
    Assert(!at_end());

    if (!cursor->find_entry_ge("W" + tname)) {
        // The exact term we asked for isn't there, so check if the next
        // term after it also has a W prefix.
        if (!cursor->after_end() && !startswith(cursor->current_key, 'W')) {
            // We've reached the end of the prefixed terms.
            cursor->to_end();
        }
    }
    RETURN(NULL);
}

bool
ChertSpellingWordsList::at_end() const
{
    LOGCALL(DB, bool, "ChertSpellingWordsList::at_end", NO_ARGS);
    RETURN(cursor->after_end());
}

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