tags.h

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// -*- C++ -*-
//
//  This file is part of Siena, a wide-area event notification system.
//  See http://www.inf.usi.ch/carzaniga/siena/
//
//  Authors: Antonio Carzaniga
//  See the file AUTHORS for full details. 
//
//  Copyright (C) 2013 University of Colorado
//
//  Siena 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 3 of the License, or
//  (at your option) any later version.
//  
//  Siena 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 Siena.  If not, see <http://www.gnu.org/licenses/>.
//
#ifndef SIENA_TAGS_H_INCLUDED
#define SIENA_TAGS_H_INCLUDED

#include <string>

namespace siena {

class Tag {
public:
    virtual ~Tag() {};

    virtual std::string to_string() const = 0;

    virtual std::string & to_string(std::string &) const = 0;
};

class TagSet {
public:
    virtual ~TagSet() {};

    class Iterator : public Tag {
    public:
        virtual bool next() = 0;

        virtual ~Iterator() {};
    };

    virtual Iterator * first() const = 0;
};

class TagSetList {
public:
    virtual ~TagSetList() {};

    class Iterator : public TagSet {
    public:
        virtual bool next() = 0;
        virtual ~Iterator() {};
    };

    virtual Iterator * first() const = 0;
};

} // end namespace siena

#endif