SoFieldConverter.h

/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Ronen Barzel (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_FIELD_CONVERTER_
#define  _SO_FIELD_CONVERTER_
 
#include <Inventor/SoDB.h>
#include <Inventor/engines/SoSubEngine.h>
 
//
//  Class: SoFieldConverter
//
//  Abstract base class for all field converter engines. A field
//  converter engine is used to convert the value of a field of one
//  type to another. These engines are registered with the global
//  database so connections between fields of different types can be
//  made by automatically inserting a converter instance.
//  A single class of converter engine may be registered for several
//  different conversions.
//  Field converters are never written to file
//  (SoField::writeConnection takes care of that).
//
 
 
{
 
  SO_ENGINE_ABSTRACT_HEADER(SoFieldConverter);
 
 public:
  // These must be defined in each subclass. They return the input
  // and output connections of the given types.
  virtual SoField *           getInput(SoType type)  = 0;
  virtual SoEngineOutput *    getOutput(SoType type) = 0;
 
  // Returns the input that is connected.  By default, this searches
  // through the field data for the field that is connected;
  // you can redefine to make more efficient.
  virtual SoField *           getConnectedInput();
 
 private:
  static void         initClass();
  static void         exitClass();
  static void         initClasses();  // init all builtin converters
  static void         exitClasses();
 
  // Adds all fields connected from the output of the converter to
  // the given list
  int                 getForwardConnections(SoFieldList &list) const;
 
 private:
  SoFieldConverter();
 
  virtual ~SoFieldConverter();
};
 
#endif /* _SO_FIELD_CONVERTER_ */