valuestreamdocument.h

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/* Copyright (C) 2009,2011,2014 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 XAPIAN_INCLUDED_VALUESTREAMDOCUMENT_H
#define XAPIAN_INCLUDED_VALUESTREAMDOCUMENT_H
 
#include "backends/document.h"
#include "backends/valuelist.h"
#include "omassert.h"
#include "xapian/database.h"
#include "xapian/types.h"
 
#include <map>
 
class ValueStreamDocument : public Xapian::Document::Internal {
    void operator=(const ValueStreamDocument &);
 
    ValueStreamDocument(const ValueStreamDocument &);
 
    mutable std::map<Xapian::valueno, ValueList *> valuelists;
 
    Xapian::Database db;
 
    size_t current;
 
    mutable Xapian::Document::Internal * doc;
 
  public:
    explicit ValueStreamDocument(const Xapian::Database & db_)
        : Internal(db_.internal[0], 0), db(db_), current(0), doc(NULL) { }
 
    void new_subdb(int n);
 
    ~ValueStreamDocument();
 
    void set_document(Xapian::docid did_) {
        // did needs to be the document id in the sub-database.
        size_t multiplier = db.internal.size();
        did = (did_ - 1) / multiplier + 1;
        AssertEq(current, (did_ - 1) % multiplier);
        delete doc;
        doc = NULL;
    }
 
    // Optimise away the virtual call when the matcher wants to know a value.
    std::string get_value(Xapian::valueno slot) const {
        return ValueStreamDocument::do_get_value(slot);
    }
 
  private:
    std::string do_get_value(Xapian::valueno slot) const;
    void do_get_all_values(std::map<Xapian::valueno, std::string> & values_) const;
    std::string do_get_data() const;
};
 
#endif // XAPIAN_INCLUDED_VALUESTREAMDOCUMENT_H