include/xapian/valueiterator.h

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/* Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2002 Ananova Ltd
 * Copyright 2002,2003,2004,2007 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_OMVALUEITERATOR_H
#define OM_HGUARD_OMVALUEITERATOR_H

#include <iterator>
#include <string>
#include <xapian/types.h>
#include <xapian/document.h>
#include <xapian/visibility.h>

namespace Xapian {

class XAPIAN_VISIBILITY_DEFAULT ValueIterator {
    private:
        friend class Document;
        friend bool operator==(const ValueIterator &a, const ValueIterator &b);
        friend bool operator!=(const ValueIterator &a, const ValueIterator &b);

        ValueIterator(Xapian::valueno index_, const Document & doc_)
            : index(index_), doc(doc_) { }

        Xapian::valueno index;
        Document doc;

    public:
        ValueIterator() : index(0), doc() { }

        ~ValueIterator() { }

        ValueIterator(const ValueIterator &other) {
            index = other.index;
            doc = other.doc;
        }

        void operator=(const ValueIterator &other) {
            index = other.index;
            doc = other.doc;
        }

        ValueIterator & operator++() {
            ++index;
            return *this;
        }

        ValueIterator operator++(int) {
            ValueIterator tmp = *this;
            ++index;
            return tmp;
        }

        const std::string & operator*() const;

        const std::string * operator->() const;

        Xapian::valueno get_valueno() const;

        std::string get_description() const;


        typedef std::input_iterator_tag iterator_category;
        typedef std::string value_type;
        typedef Xapian::valueno_diff difference_type;
        typedef std::string * pointer;
        typedef std::string & reference;
};

inline bool operator==(const ValueIterator &a, const ValueIterator &b)
{
    return (a.index == b.index);
}

inline bool operator!=(const ValueIterator &a, const ValueIterator &b)
{
    return (a.index != b.index);
}

}

#endif /* OM_HGUARD_OMVALUEITERATOR_H */

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