matcher/selectpostlist.h

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/* selectpostlist.h: Parent class for classes which only return selected docs
 *
 * ----START-LICENCE----
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 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_SELECTPOSTLIST_H
#define OM_HGUARD_SELECTPOSTLIST_H

#include "postlist.h"

class SelectPostList : public PostList {
    private:
        // Prevent copying
        SelectPostList(const SelectPostList &);
        SelectPostList & operator=(const SelectPostList &);

    protected:
        PostList *source;

        virtual bool test_doc() = 0;
    public:
        PostList *next(Xapian::weight w_min);
        PostList *skip_to(Xapian::docid did, Xapian::weight w_min);

        // pass all these through to the underlying source PostList
        Xapian::doccount get_termfreq_max() const { return source->get_termfreq_max(); }
        Xapian::doccount get_termfreq_min() const { return 0; }
        Xapian::weight get_maxweight() const { return source->get_maxweight(); }
        Xapian::docid get_docid() const { return source->get_docid(); }
        Xapian::weight get_weight() const { return source->get_weight(); }
        Xapian::doclength get_doclength() const { return source->get_doclength(); }
        Xapian::weight recalc_maxweight() { return source->recalc_maxweight(); }
        PositionList * read_position_list() { return source->read_position_list(); }
        PositionList * open_position_list() const { return source->open_position_list(); }
        bool at_end() const { return source->at_end(); }

        std::string get_description() const;    
    
        SelectPostList(PostList *source_) : source(source_) { }
        ~SelectPostList() { delete source; }
};

inline std::string
SelectPostList::get_description() const
{
    return "(Select " + source->get_description() + ")";
}

#endif /* OM_HGUARD_SELECTPOSTLIST_H */

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