SoSubNode.h

#ifndef COIN_SOSUBNODE_H
#define COIN_SOSUBNODE_H

/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

/*
  The most used macros and their arguments:

  header files:
    SO_NODE_HEADER(classname)
    SO_NODE_ABSTRACT_HEADER(classname)

  source files:
    SO_NODE_SOURCE(classname)
    SO_NODE_ABSTRACT_SOURCE(classname)
    in constructor:
      SO_NODE_CONSTRUCTOR(classname)
      SO_NODE_DEFINE_ENUM_VALUE(enumname, enumvalue)
      SO_NODE_ADD_FIELD(fieldname, (defaultvalue))
    in initClass():
      SO_NODE_INIT_CLASS(classname, parentclassname, parentclassname)
      SO_NODE_INIT_ABSTRACT_CLASS(classname, parentclassname, parentclassname)
*/

// *************************************************************************

#include <string.h> /* strcmp used in assert() */
#include <Inventor/SbName.h>
#include <Inventor/SoType.h>
#include <Inventor/fields/SoFieldData.h>
#include <Inventor/nodes/SoNode.h>
#include <Inventor/C/tidbits.h>

// *************************************************************************

#define PRIVATE_NODE_TYPESYSTEM_HEADER( ) \
public: \
  static SoType getClassTypeId(void); \
  virtual SoType getTypeId(void) const; \
private: \
  static SoType classTypeId

// FIXME: document. 20000103 mortene.
#define SO_NODE_ABSTRACT_HEADER(_class_) \
  PRIVATE_NODE_TYPESYSTEM_HEADER(); \
protected: \
  static const SoFieldData ** getFieldDataPtr(void); \
  virtual const SoFieldData * getFieldData(void) const; \
private: \
  static void atexit_cleanup(void); \
  static const SoFieldData ** parentFieldData; \
  static SoFieldData * fieldData; \
  /* Counts number of instances of subclasses aswell as "direct" */ \
  /* instances from non-abstract classes. */ \
  static unsigned int classinstances


// FIXME: document. 20000103 mortene.
#define SO_NODE_HEADER(_class_) \
  SO_NODE_ABSTRACT_HEADER(_class_); \
private: \
  static void * createInstance(void)

// *************************************************************************

#define PRIVATE_NODE_TYPESYSTEM_SOURCE(_class_) \
SoType _class_::getClassTypeId(void) { return _class_::classTypeId; } \
SoType _class_::getTypeId(void) const { return _class_::classTypeId; } \
SoType _class_::classTypeId STATIC_SOTYPE_INIT


// FIXME: document. 20000103 mortene.
#define SO_NODE_ABSTRACT_SOURCE(_class_) \
PRIVATE_NODE_TYPESYSTEM_SOURCE(_class_); \
 \
unsigned int _class_::classinstances = 0; \
const SoFieldData ** _class_::parentFieldData = NULL; \
SoFieldData * _class_::fieldData = NULL; \
 \
const SoFieldData ** \
_class_::getFieldDataPtr(void) \
{ \
  return const_cast<const SoFieldData **>(&_class_::fieldData); \
} \
 \
const SoFieldData * \
_class_::getFieldData(void) const \
{ \
  return _class_::fieldData; \
} \
 \
void \
_class_::atexit_cleanup(void) \
{ \
  delete _class_::fieldData; \
  _class_::fieldData = NULL; \
  _class_::parentFieldData = NULL; \
  SoType::removeType(_class_::classTypeId.getName()); \
  _class_::classTypeId STATIC_SOTYPE_INIT; \
  _class_::classinstances = 0; \
}

// FIXME: document. 20000103 mortene.
#define SO_NODE_SOURCE(_class_) \
SO_NODE_ABSTRACT_SOURCE(_class_) \
 \
 \
void * \
_class_::createInstance(void) \
{ \
  return new _class_; \
}

// *************************************************************************

// FIXME: document. 20000103 mortene.
#define SO_NODE_IS_FIRST_INSTANCE() \
   (classinstances == 1)

// FIXME: document. 20000103 mortene.
#define SO_NODE_CONSTRUCTOR_NOLOCK(_class_) \
  do { \
    _class_::classinstances++; \
    /* Catch attempts to use a node class which has not been initialized. */ \
    assert(_class_::classTypeId != SoType::badType() && "you forgot init()!"); \
    /* Initialize a fielddata container for the class only once. */ \
    if (!_class_::fieldData) { \
      /* FIXME: this is a "static" memory leak. 20030131 mortene. */ \
      /* Internal Coin nodes are handled properly though. pederb, 20041122 */ \
      _class_::fieldData = \
        new SoFieldData(_class_::parentFieldData ? \
                        *_class_::parentFieldData : NULL); \
    } \
    /* Extension classes from the application programmers should not be \
       considered native. This is important to get the export code to do \
       the Right Thing. */ \
    this->isBuiltIn = FALSE; \
  } while (0)

// FIXME: document. 20000103 mortene.
#define SO_NODE_CONSTRUCTOR(_class_) \
  do { \
    SoBase::staticDataLock(); \
    SO_NODE_CONSTRUCTOR_NOLOCK(_class_); \
    SoBase::staticDataUnlock(); \
  } while (0)

// *************************************************************************

// FIXME: create-type with get-next and inc-next must be an atomic step in an MT
// environment  20020216 larsa
// FIXME: you can not use the _parentclass_ argument directly as a class specifier
// in initClass because such usage causes dynamic loading to fail when trying to
// invoke the initClass method in the case where _parentclass_ also has to be
// dynamically loaded.  that is the reason for this roundabout way of getting the
// parent class type.  20020216 larsa

#define PRIVATE_COMMON_INIT_CODE(_class_, _classname_, _createfunc_, _parentclass_) \
  do { \
    /* Make sure we only initialize once. */ \
    assert(_class_::classTypeId == SoType::badType() && "don't init() twice!"); \
    /* Make sure superclass gets initialized before subclass. */ \
    assert(strcmp(SO__QUOTE(_parentclass_), "inherited")); \
    SoType parentType(SoType::fromName(SO__QUOTE(_parentclass_))); \
    assert(parentType != SoType::badType() && "you forgot init() on parentclass!"); \
 \
    /* Set up entry in the type system. */ \
    _class_::classTypeId = \
      SoType::createType(parentType, \
                         _classname_, \
                         _createfunc_, \
                         SoNode::getNextActionMethodIndex()); \
    SoNode::incNextActionMethodIndex(); \
 \
    /* Store parent's fielddata pointer for later use in the constructor. */ \
    _class_::parentFieldData = _parentclass_::getFieldDataPtr(); \
\
    /* Make sure also external nodes are cleaned up */ \
    cc_coin_atexit_static_internal(_class_::atexit_cleanup); \
  } while (0)


// FIXME: document. 20000103 mortene.
#define SO_NODE_INIT_CLASS(_class_, _parentclass_, _parentname_) \
  do { \
    const char * classname = SO__QUOTE(_class_); \
    PRIVATE_COMMON_INIT_CODE(_class_, classname, &_class_::createInstance, _parentclass_); \
  } while (0)

// FIXME: document. 20000103 mortene.
#define SO_NODE_INIT_ABSTRACT_CLASS(_class_, _parentclass_, _parentname_) \
  do { \
    const char * classname = SO__QUOTE(_class_); \
    PRIVATE_COMMON_INIT_CODE(_class_, classname, NULL, _parentclass_); \
  } while (0)


// *************************************************************************

// FIXME: document. 20000103 mortene.
#define SO_NODE_ADD_FIELD(_field_, _defaultval_) \
  do { \
    this->_field_.setValue _defaultval_;\
    this->_field_.setContainer(this); \
    fieldData->addField(this, SO__QUOTE(_field_), &this->_field_); \
  } while (0)

// New for Coin-3
#define SO_NODE_ADD_EMPTY_MFIELD(_field_) \
  do { \
    this->_field_.setContainer(this); \
    fieldData->addField(this, SO__QUOTE(_field_), &this->_field_);\
  } while (0)


// FIXME: document. 20000103 mortene.
#define SO_NODE_DEFINE_ENUM_VALUE(_enumname_, _enumval_) \
  do { \
    fieldData->addEnumValue(SO__QUOTE(_enumname_), \
                            SO__QUOTE(_enumval_), _enumval_); \
  } while (0)

// *************************************************************************

#endif // !COIN_SOSUBNODE_H