common/document.h

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/* document.h: class with document data
 *
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002 Ananova Ltd
 * Copyright 2003,2004,2005,2007 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

#ifndef OM_HGUARD_DOCUMENT_H
#define OM_HGUARD_DOCUMENT_H

#include <xapian/base.h>
#include <xapian/types.h>
#include "termlist.h"
#include "database.h"
#include "documentterm.h"
#include <map>
#include <string>

using namespace std;

class Xapian::Document::Internal : public Xapian::Internal::RefCntBase {
    friend class Xapian::ValueIterator;
    public:
        typedef map<Xapian::valueno, string> document_values;

        typedef map<string, OmDocumentTerm> document_terms;

    private:
        // Prevent copying
        Internal(const Internal &);
        Internal & operator=(const Internal &);

        const Xapian::Database::Internal *database;

        bool data_here;
        mutable bool values_here; // FIXME mutable is a hack
        mutable bool terms_here;

        string data;

        mutable document_values values; // FIXME mutable is a hack

        mutable vector<Xapian::valueno> value_nos; // FIXME mutable is a hack

        mutable document_terms terms;

    protected:
        Xapian::docid did;

    private:
        // Functions for backend to implement
        virtual string do_get_value(Xapian::valueno /*valueno*/) const { return ""; }
        virtual map<Xapian::valueno, string> do_get_all_values() const {
            map<Xapian::valueno, string> none;
            return none;
        }
        virtual string do_get_data() const { return ""; }

    public:
        string get_value(Xapian::valueno valueid) const;

        Xapian::valueno values_count() const;
        void add_value(Xapian::valueno, const string &);
        void remove_value(Xapian::valueno);
        void clear_values();
        void add_posting(const string &, Xapian::termpos, Xapian::termcount);
        void add_term(const string &, Xapian::termcount);
        void remove_posting(const string &, Xapian::termpos, Xapian::termcount);
        void remove_term(const string &);
        void clear_terms();
        Xapian::termcount termlist_count() const;

        string get_data() const;        

        void set_data(const string &);

        TermList * open_term_list() const;

        void need_values() const;
        void need_terms() const;

        Xapian::docid get_docid() const { return did; }

        string get_description() const;

        Internal(const Xapian::Database::Internal *database_, Xapian::docid did_)
            : database(database_), data_here(false), values_here(false),
              terms_here(false), did(did_) { }

        Internal()
            : database(0), data_here(false), values_here(false),
              terms_here(false) { }

        virtual ~Internal() { }
};

#endif  // OM_HGUARD_DOCUMENT_H

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