OMKIAccessor.h

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/************************************************************************/
/* This file is part of openMask(c) INRIA, CNRS, Universite de Rennes 1 */
/* 1993-2002, thereinafter the Software                                 */
/*                                                                      */
/* The Software has been developped within the Siames Project.          */
/* INRIA, the University of Rennes 1 and CNRS jointly hold intellectual */
/* property rights                                                      */
/*                                                                      */
/* The Software has been registered with the Agence pour la Protection  */
/* des Programmes (APP) under registration number                       */
/* IDDN.FR.001.510008.00.S.P.2001.000.41200                             */
/*                                                                      */
/* This file may be distributed under the terms of the Q Public License */
/* version 1.0 as defined by Trolltech AS of Norway and appearing in    */
/* the file LICENSE.QPL included in the packaging of this file.         */
/*                                                                      */
/* Licensees holding valid specific licenses issued by INRIA, CNRS or   */
/* Universite Rennes 1 for the software may use this file in            */
/* acordance with that specific license                                 */
/************************************************************************/
                
#if !defined OMK_IACCESSORS_H
#define OMK_IACCESSORS_H

#include "OMKTracer.h"

namespace OMK  
{
//-----------------------------------------------------------------

template< typename T >
class IAccessorT
{ 
public:
  virtual ~IAccessorT() {}
  virtual const T& get() const = 0 ;
  virtual void set( const T& value ) = 0 ;
  operator const T&() const { return get() ; } 
} ;
//-----------------------------------------------------------------

template< typename T >
class AccessorT : public IAccessorT< T >
{ 

public:
  AccessorT( const T& initialValue ) : _value( initialValue ) {}
  virtual ~AccessorT() {}


  virtual const T& get() const { return _value ; }
  virtual void set( const T& value ) { _value = value ; }
  operator T&() { return _value ; }
protected:
  T _value ;
} ;
//-----------------------------------------------------------------

template< typename T, typename ObjectT >
class AccessorFctT : public IAccessorT< T >
{ 
public:
  typedef const T & (ObjectT::*GetMethod)() const ;
  typedef void (ObjectT::*SetMethod)( const T & value ) ;
  AccessorFctT( ObjectT *object, SetMethod setMethod, GetMethod getMethod )
    : _object( object ), _setMethod( setMethod ), _getMethod( getMethod ) {}
  virtual ~AccessorFctT() {}


  virtual const T& get() const { return (_object->*_getMethod)() ; }
  virtual void set( const T& value ) { (_object->*_setMethod)( value ) ; }
protected:
  ObjectT *_object ;
  SetMethod _setMethod ;
  GetMethod _getMethod ;
} ;
//-----------------------------------------------------------------

template< typename T, typename T2 >
class AccessorAccT : public IAccessorT< T >
{ 
public:
  AccessorAccT( IAccessorT< T2 >* accessor )
    : _accessor( accessor ) 
  { 
    OMASSERTM( _accessor, "Must be valid" ) ;
  }
  virtual ~AccessorAccT() {}






  virtual const T& get() const 
  { 
    // Gets and cast the value
    _tmpValue = (T)_accessor->get() ; 
    // Returns the cast value
    return _tmpValue ; 
  }
  virtual void set( const T& value ) 
  { // Casts and sets the value
    _accessor->set( (T2)value ) ; 
  }
  void setAccessor( IAccessorT< T2 >* accessor )
  {
    _accessor = accessor ;
    OMASSERTM( _accessor, "Must be valid" ) ;
  }
protected:
  IAccessorT< T2 >* _accessor ;
private:
  mutable T _tmpValue ;
} ;
//-----------------------------------------------------------------


}// namespace OMK

#endif // defined OMK_IACCESSORS_H

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