backends/quartz/quartz_alldocspostlist.h

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/* quartz_alldocspostlist.h: All document postlists in quartz databases
 *
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002 Ananova Ltd
 * Copyright 2002,2003,2004,2005,2007 Olly Betts
 * Copyright 2006 Richard Boulton
 *
 * 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
 */

#ifndef OM_HGUARD_QUARTZ_ALLDOCSPOSTLIST_H
#define OM_HGUARD_QUARTZ_ALLDOCSPOSTLIST_H

#include <map>
#include <string>

#include "leafpostlist.h"
#include <xapian/database.h>
#include <xapian/postingiterator.h>
#include "database.h"
#include "omassert.h"
#include "quartz_types.h"
#include "btree.h"

using namespace std;

class Bcursor;

class QuartzDocIdList;

class QuartzDocIdListIterator {
    private:
        const map<Xapian::docid, Xapian::docid> * ranges;
        map<Xapian::docid, Xapian::docid>::const_iterator currrange;
        Xapian::docid currdocid;

        friend class QuartzDocIdList;

        QuartzDocIdListIterator(const map<Xapian::docid, Xapian::docid> * ranges_);
        QuartzDocIdListIterator(const map<Xapian::docid, Xapian::docid> * ranges_, int);

    public:
        Xapian::docid operator*() {
            return currdocid;
        }

        friend bool operator==(const QuartzDocIdListIterator &a,
                               const QuartzDocIdListIterator &b);

        QuartzDocIdListIterator();
        ~QuartzDocIdListIterator() {}
        QuartzDocIdListIterator(const QuartzDocIdListIterator & other);
        void operator=(const QuartzDocIdListIterator & other);

        QuartzDocIdListIterator & operator++();

        Xapian::DocIDWrapper operator++(int) {
            Xapian::docid tmp = **this;
            operator++();
            return Xapian::DocIDWrapper(tmp);
        }

        Xapian::docid operator *() const { return currdocid; }


        typedef std::input_iterator_tag iterator_category;
        typedef Xapian::docid value_type;
        typedef Xapian::doccount_diff difference_type;
        typedef Xapian::docid * pointer;
        typedef Xapian::docid & reference;
};

inline bool operator==(const QuartzDocIdListIterator &a,
                       const QuartzDocIdListIterator &b)
{
    if (a.ranges != b.ranges)
        return false;
    return a.currdocid == b.currdocid;
}

inline bool operator!=(const QuartzDocIdListIterator &a,
                       const QuartzDocIdListIterator &b)
{
    return !(a==b);
}

class QuartzDocIdList {
    private:
        map<Xapian::docid, Xapian::docid> ranges;

    public:
        QuartzDocIdList() {}
        void addDocId(Xapian::docid did);

        QuartzDocIdListIterator begin() const {
            return QuartzDocIdListIterator(&ranges);
        }

        QuartzDocIdListIterator end() const {
            return QuartzDocIdListIterator(&ranges, 1);
        }
};

class QuartzAllDocsPostList : public LeafPostList {
    private:
        Xapian::Internal::RefCntPtr<const Xapian::Database::Internal> this_db;

        QuartzDocIdList docids;

        QuartzDocIdListIterator dociditer;

        Xapian::doccount doccount;

        bool have_started;

        QuartzAllDocsPostList(const QuartzAllDocsPostList &);

        void operator=(const QuartzAllDocsPostList &);

    public:
        QuartzAllDocsPostList(Xapian::Internal::RefCntPtr<const Xapian::Database::Internal> this_db_,
                              const Btree * table,
                              Xapian::doccount doccount_);

        ~QuartzAllDocsPostList();

        Xapian::doccount get_termfreq() const { return doccount; }

        Xapian::docid get_docid() const {
            Assert(have_started);
            return *dociditer;
        }

        Xapian::doclength get_doclength() const {
            Assert(have_started);
            return this_db->get_doclength(*dociditer);
        }

        Xapian::termcount get_wdf() const {
            Assert(have_started);
            return static_cast<Xapian::termcount>(1);
        }

        PositionList *read_position_list() {
            throw Xapian::InvalidOperationError("Can't read position list from all docs postlist.");
        }

        PositionList * open_position_list() const {
            throw Xapian::InvalidOperationError("Can't read position list from all docs postlist.");
        }

        PostList * next(Xapian::weight w_min);

        PostList * skip_to(Xapian::docid desired_did, Xapian::weight w_min);

        bool at_end() const { return (have_started && dociditer == docids.end()); }

        std::string get_description() const;
};

#endif /* OM_HGUARD_QUARTZ_ALLDOCSPOSTLIST_H */

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