ModelIterator.hpp

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/*
 * Copyright (C) 2004  Andrew Sutton
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to:
 *
 * The Free Software Foundation, Inc.
 * 59 Temple Place, Suite 330
 * Boston, MA  02111-1307  USA
 *
 * Contact:
 *   Andrew Sutton  asutton@cs.kent.edu
 */

#ifndef OMF_MODELITERATOR_HPP
#define OMF_MODELITERATOR_HPP

// std includes
#include <queue>

namespace OMF
{
  // forward declarations
  class Model;
  class ModelObject;

  class ModelIterator
  {
  public:
    enum Traversal {
      Prefix,
      Postfix
    };

    ModelIterator();
    ModelIterator(const ModelIterator &iter);
    ModelIterator(ModelObject *obj);
    ModelIterator(Model *model);
    ~ModelIterator();

    const ModelIterator &operator =(ModelObject *begin);
    const ModelIterator &operator =(Model *begin);

    const ModelIterator &operator ++();
    ModelIterator operator ++(int);

    operator bool() const
    { return !_queue.empty(); }

    ModelObject *operator *()
    { return _queue.front(); }

    ModelObject *operator ->()
    { return _queue.front(); }

    void pre(ModelObject *obj);
    void pre(Model *model);

    void post(ModelObject *obj);
    void post(Model *model);

  private:
    void init(ModelObject *obj, Traversal trav);

  private:
    std::queue<ModelObject *> _queue;
  };
}

#endif

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