void 
PackageIdReplacementCheck::checkReferencedElement(ReplacedBy& repBy)
{
  unsigned int numErrsB4 = repBy.getSBMLDocument()->getNumErrors();
  
  SBase* refElem = repBy.getReferencedElement();
  
  // if there is an issue with references the getReferencedElement
  // will log errors and possibly fail
  // we dont want to try any further
  unsigned int numErrsAfter = repBy.getSBMLDocument()->getNumErrors();

  if (numErrsB4 != numErrsAfter || refElem == NULL)
  {
    return;
  }

  SBase * parent = repBy.getParentSBMLObject();

  if (parent->isSetId() == true && refElem->isSetId() == false)
  {
    logMissingIdAttribute(repBy, refElem, parent);
  }

}
void 
ClassReplacements::checkReferencedElement(ReplacedBy& repBy)
{
  unsigned int numErrsB4 = repBy.getSBMLDocument()->getNumErrors();
  
  SBase* refElem = repBy.getReferencedElement();
  
  // if there is an issue with references the getReferencedElement
  // will log errors and possibly fail
  // we dont want to try any further
  unsigned int numErrsAfter = repBy.getSBMLDocument()->getNumErrors();

  if (numErrsB4 != numErrsAfter || refElem == NULL)
  {
    return;
  }

  SBase * parent = repBy.getParentSBMLObject();

  if (refElem->getTypeCode() != parent->getTypeCode())
  {
    int refElemTC = refElem->getTypeCode();
    // exception is anything with mathematical meaning
    // may replace a parameter
    if (parent->getTypeCode() == SBML_PARAMETER)
    {
      if (refElemTC == SBML_COMPARTMENT || refElemTC == SBML_SPECIES ||
        refElemTC == SBML_SPECIES_REFERENCE || refElemTC == SBML_REACTION
        || refElemTC == SBML_LOCAL_PARAMETER)
      {
        return;
      }

    }
    else if (parent->getTypeCode() == SBML_LOCAL_PARAMETER)
    {
      if (refElemTC == SBML_PARAMETER)
      {
        return;
      }
    }

    logBadClassReplacement(repBy, refElem, parent);
  }


}
void 
UnitReplacementCheck::checkReferencedElement(ReplacedBy& repBy)
{
  unsigned int numErrsB4 = repBy.getSBMLDocument()->getNumErrors();
  
  SBase* refElem = repBy.getReferencedElement();
  
  // if there is an issue with references the getReferencedElement
  // will log errors and possibly fail
  // we dont want to try any further
  unsigned int numErrsAfter = repBy.getSBMLDocument()->getNumErrors();

  if (numErrsB4 != numErrsAfter || refElem == NULL)
  {
    return;
  }

  SBase * parent = repBy.getParentSBMLObject();
  UnitDefinition *parentUnits = parent->getDerivedUnitDefinition();
  //bool delparunit = parent->getTypeCode()==SBML_PARAMETER;
  
  UnitDefinition *refElemUnits = refElem->getDerivedUnitDefinition();
  //bool delrefunit = refElem->getTypeCode()==SBML_PARAMETER;

  if (parentUnits == NULL || refElemUnits == NULL)
  {
    //if (delparunit)
    //{
    //  delete parentUnits;
    //}
    //if (delrefunit)
    //{
    //  delete refElemUnits;
    //}
    return;
  }

  if (parent->containsUndeclaredUnits() == true ||
    refElem->containsUndeclaredUnits() == true)
  {
    //if (delparunit)
    //{
    //  delete parentUnits;
    //}
    //if (delrefunit)
    //{
    //  delete refElemUnits;
    //}
    return;
  }

  if (UnitDefinition::areIdentical(parentUnits, refElemUnits) == false)
  {
    logMismatchUnits(repBy, refElem, parent);
  }
  else
  {
    // if we have Compartments that have spatialDimensions but no units
    // we can check this 
    if (parent->getTypeCode() == SBML_COMPARTMENT 
      && parentUnits->getNumUnits() == 0
      && refElem->getTypeCode() == SBML_COMPARTMENT
      && refElemUnits->getNumUnits() == 0)
    {
      if (static_cast<Compartment *>(parent)->isSetSpatialDimensions() == true
      && static_cast<Compartment *>(refElem)->isSetSpatialDimensions() == true)
      {
        if (util_isEqual(
          static_cast<Compartment *>(parent)->getSpatialDimensionsAsDouble(),
          static_cast<Compartment *>(refElem)->getSpatialDimensionsAsDouble())
                         == 0)
        {
          logMismatchSpatialDimensions(repBy, refElem, parent);
        }
      }
    }
  }
  //if (delparunit)
  //{
  //  delete parentUnits;
  //}
  //if (delrefunit)
  //{
  //  delete refElemUnits;
  //}

}