element_import_handler.h

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/*
    Copyright (C) 2008 Paul Davis
    Author: Sakari Bergen

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __ardour_element_import_handler_h__
#define __ardour_element_import_handler_h__

#include <string>
#include <list>
#include <set>

#include <boost/shared_ptr.hpp>

#include "ardour/libardour_visibility.h"
#include "pbd/libpbd_visibility.h"

class XMLTree;

namespace ARDOUR {

class Session;
class ElementImporter;

class LIBARDOUR_API ElementImportHandler
{
  public:
        typedef boost::shared_ptr<ElementImporter> ElementPtr;
        typedef std::list<ElementPtr> ElementList;

        ElementImportHandler (XMLTree const & source, ARDOUR::Session & session)
                : source (source), session (session) { }

        virtual ~ElementImportHandler ();

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

        ElementList elements;

        /* For checking duplicates names against queued elements */

        bool check_name (const std::string & name) const;

        void add_name (std::string name);

        void remove_name (const std::string & name);

        static bool dirty () { return _dirty; }

        static void set_dirty () { _dirty = true; }

        static bool errors () { return _errors; }

        static void set_errors () { _errors = true; }

  protected:
        XMLTree const &   source;

        ARDOUR::Session & session;

        static bool _dirty;

        static bool _errors;

  private:
        std::set<std::string> names;
};

} // namespace ARDOUR

#endif