/**
* Load one related object.
*
* @param string $relationName name of the desired relation
* @param GenericCriterionObject $criterion criterion object
*
* @return GenericORMapperDataObject object that is related with the current object or null.
* @throws GenericORMapperException In case the data component is not initialized.
*
* @author Tobias Lückel
* @version
* Version 0.1, 09.09.2010<br />
*/
public function loadRelatedObject($relationName, GenericCriterionObject $criterion = null)
{
// check weather data component is there
if ($this->dataComponent === null) {
throw new GenericORMapperException('[GenericDomainObject::loadRelatedObject()] ' . 'The data component is not initialized, so related object cannot be loaded! ' . 'Please use the or mapper\'s loadRelatedObject() method or call ' . 'setDataComponent($orm), where $orm is an instance of the or mapper, on this ' . 'object first!', E_USER_ERROR);
}
// return objects that are related to the current object
return $this->dataComponent->loadRelatedObject($this, $relationName, $criterion);
}