include/xapian/expanddecider.h

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/* Copyright (C) 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 XAPIAN_INCLUDED_EXPANDDECIDER_H
#define XAPIAN_INCLUDED_EXPANDDECIDER_H

#include <set>
#include <string>

#include <xapian/visibility.h>

namespace Xapian {

class XAPIAN_VISIBILITY_DEFAULT ExpandDecider {
  public:
    virtual bool operator()(const std::string &term) const = 0;

    virtual ~ExpandDecider();
};

class XAPIAN_VISIBILITY_DEFAULT ExpandDeciderAnd : public ExpandDecider {
    const ExpandDecider &first, &second;

  public:
    ExpandDeciderAnd(const ExpandDecider &first_,
                     const ExpandDecider &second_)
        : first(first_), second(second_) { }

    ExpandDeciderAnd(const ExpandDecider *first_,
                     const ExpandDecider *second_)
        : first(*first_), second(*second_) { }

    virtual bool operator()(const std::string &term) const;
};

class XAPIAN_VISIBILITY_DEFAULT ExpandDeciderFilterTerms : public ExpandDecider {
    std::set<std::string> rejects;

  public:
    template <class Iterator>
    ExpandDeciderFilterTerms(Iterator reject_begin, Iterator reject_end)
        : rejects(reject_begin, reject_end) { }

    virtual bool operator()(const std::string &term) const;
};

}

#endif // XAPIAN_INCLUDED_EXPANDDECIDER_H

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