---

Feature.h

/*
 * Feature.h -- class interface for features
 * Copyright (C) 2002  Eric Lemings <elemings@users.sourceforge.net>
 *
 * This software 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 software 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 software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA
 *
 * RCS: $Id: Feature.h,v 1.6 2003/04/15 16:58:36 elemings Exp $
 */

#ifdef __cplusplus

#  ifndef OGS_CORE_FEATURE_H
#    define OGS_CORE_FEATURE_H

#    include <ogs/support/Attachable.h>
#    include <ogs/support/Object.h>
#    include <ogs/core/Namespace.h>

OGS_BEGIN_CORE_NAMESPACE

class Feature: public ogs::support::Object,
               public ogs::support::Attachable {
  public:
    virtual bool attachObject (Object& object);
    virtual bool detachObject ();
    Object* getObject () const;

    virtual ~Feature () = 0;

  protected:
    Feature ();

    virtual bool canAttach (const Object& object) const;
    virtual bool canDetach () const;

  private:
    Object* _object;
};

inline Feature::Feature ():
  _object (NULL) {
  // empty constructor body
}

inline ogs::support::Object*
Feature::getObject () const {
  return (this->_object);
}

inline bool
Feature::canAttach (const Object& object) const {
  return (&object != this && _object == NULL);
}

inline bool
Feature::canDetach () const {
  return (true);
}

inline Feature::~Feature () { }

OGS_END_CORE_NAMESPACE

#  endif /* !defined OGS_CORE_FEATURE_H */

#endif /* defined __cplusplus */

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