popcon.h

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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t -*-
#ifndef EPT_POPCON_POPCON_H
#define EPT_POPCON_POPCON_H

/*
 * Copyright (C) 2007  Enrico Zini <enrico@debian.org>
 *
 * 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
 */

#include <tagcoll/diskindex/mmap.h>
#include <string>

namespace ept {
namespace apt {
class Apt;
}

namespace popcon {

class Score
{
protected:
    unsigned offset;

public:
    float score;

    Score(float score) : offset(offset), score(score) {}

    friend class Popcon;
    friend class PopconIndexer;
    friend class PopconGenerator;
};

class Popcon : public tagcoll::diskindex::MMap
{
    struct GeneralInfo : public tagcoll::diskindex::MMap
    {
        size_t submissions() const;
    };

    tagcoll::diskindex::MasterMMap mastermmap;
    time_t m_timestamp;

    GeneralInfo m_info;

    const Score* structByIndex(size_t idx) const
    {
        if (idx >= 0 && idx < size())
            return (Score*)m_buf + idx;
        return 0;
    }

public:
    Popcon();

    time_t timestamp() const { return m_timestamp; }

    bool hasData() const { return m_timestamp != 0; }

    size_t submissions() const { return m_info.submissions(); }

    size_t size() const
    {
        if (m_buf)
            return ((Score*)m_buf)->offset / sizeof(Score);
        else
            return 0;
    }

    std::string name(size_t idx) const
    {
        const Score* s = structByIndex(idx);
        if (s == 0) return std::string();
        return std::string(m_buf + s->offset);
    }

    float scoreByIndex(size_t idx) const
    {
        const Score* s = structByIndex(idx);
        if (!s) return 0;
        return s->score;
    }

    float scoreByName(const std::string& name) const;

    float score(size_t idx) const { return scoreByIndex(idx); }

    float operator[](int idx) const { return scoreByIndex(idx); }

    float score(const std::string& name) const { return scoreByName(name); }

    float operator[](const std::string& name) const { return scoreByName(name); }
};

}
}

// vim:set ts=4 sw=4:
#endif