backends/quartz/quartz_positionlist.h

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/* quartz_positionlist.h: Position lists in quartz databases
 *
 * ----START-LICENCE----
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2001 Hein Ragas
 * Copyright 2002 Ananova Ltd
 * Copyright 2002,2003,2004 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 * -----END-LICENCE-----
 */

#ifndef OM_HGUARD_QUARTZ_POSITIONLIST_H
#define OM_HGUARD_QUARTZ_POSITIONLIST_H

#include <xapian/types.h>
#include "positionlist.h"
#include "btree.h"

#include <string>

using namespace std;

class QuartzPositionListTable : public Btree {
    public:
        QuartzPositionListTable(string path_, bool readonly_)
            : Btree(path_ + "/position_", readonly_) { }

        void set_positionlist(Xapian::docid did, const string & tname,
                        Xapian::PositionIterator pos,
                        const Xapian::PositionIterator &pos_end);

        void delete_positionlist(Xapian::docid did, const string & tname);
};

class QuartzPositionList : public PositionList {
    private:
        string data;

        const char * pos;

        const char * end;

        bool is_at_end;

        bool have_started;

        Xapian::termpos current_pos;
        
        Xapian::termcount number_of_entries;

        QuartzPositionList(const QuartzPositionList &);

        void operator=(const QuartzPositionList &);

        void next_internal();

    public:
        QuartzPositionList() : have_started(false) {}

        ~QuartzPositionList() { return; }

        void read_data(const Btree * table,
                       Xapian::docid did,
                       const string & tname);

        Xapian::termcount get_size() const {
            DEBUGCALL(DB, Xapian::termcount, "QuartzPositionList::get_size", "");
            RETURN(number_of_entries);
        }

        Xapian::termpos get_position() const {
            Assert(have_started);
            DEBUGCALL(DB, Xapian::termpos, "QuartzPositionList::get_position", "");
            RETURN(current_pos);
        }

        void next();

        void skip_to(Xapian::termpos termpos);

        bool at_end() const {
            DEBUGCALL(DB, bool, "QuartzPositionList::at_end", "");
            RETURN(is_at_end);
        }

        Xapian::termpos get_current_pos() {
            return(current_pos);
        }
};

#endif /* OM_HGUARD_QUARTZ_POSITIONLIST_H */

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