/**
* Implements adder mechanism.
*
* @see Opus_Model_Abstract::_addFieldValue()
*/
protected function _addFieldValue(Opus_Model_Field $field, $value)
{
// get Modelclass if model is linked
$linkmodelclass = $field->getLinkModelClass();
if (!is_null($linkmodelclass)) {
// Check if $linkmodelclass is a known class name
if (class_exists($linkmodelclass) === false) {
throw new Opus_Model_Exception("Link model class '{$linkmodelclass}' does not exist.");
}
if (is_null($value)) {
throw new InvalidArgumentException('Argument required when adding to a link field.');
}
if (!$value instanceof Opus_Model_Dependent_Link_Abstract) {
$linkmodel = new $linkmodelclass();
$linkmodel->setModel($value);
$value = $linkmodel;
}
}
$value = parent::_addFieldValue($field, $value);
if ($value instanceof Opus_Model_Dependent_Abstract) {
$value->setParentId($this->getId());
}
return $value;
}