propertyproxyreadonly.h

/***************************************************************************
 *   Copyright (C) 2004 by Rick L. Vinyard, Jr.                            *
 *   rvinyard@cs.nmsu.edu                                                  *
 *                                                                         *
 *   This program 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 version 2.1.                *
 *                                                                         *
 *   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 Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA              *
 ***************************************************************************/
#ifndef IDIOSKOPOSPROPERTYPROXYREADONLY_H
#define IDIOSKOPOSPROPERTYPROXYREADONLY_H

#include <idioskopos/propertyproxybase.h>

namespace Idioskopos {

template <typename T> class Property;

template <typename T>
  class PropertyProxyReadOnly: public virtual PropertyProxyBase {
  public:
  PropertyProxyReadOnly(Object& object, const std::string name): PropertyProxyBase(object, name) { }

    ~PropertyProxyReadOnly() { }

    T   get_value () {
      Property<T>* p = get_property_ptr();
      if (p)
        return p->get_value();
      else
        return T();
    }

    operator T () { return get_value(); }

    Property<T>* get_property_ptr();

  };
}

#include <idioskopos/property.h>

namespace Idioskopos {

template <typename T>
  inline
  Property<T>* PropertyProxyReadOnly<T>::get_property_ptr() {
    PropertyBase* pb = m_object.get_property(m_name);
    if (pb)
      return dynamic_cast<Property<T>*>(pb);
    else
      return NULL;
  }

}

#endif

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