/**
* Format field
*
* @param Field $field A field instance
* @param ItemInterface $item An entity instance
*
* @return string
*/
protected function format(Field $field, ItemInterface $item)
{
$name = $field->getName();
$method = $field->getMethod();
$value = $item->{$method}();
if ($field->get('cdata')) {
$value = $this->dom->createCDATASection($value);
$element = $this->dom->createElement($name);
$element->appendChild($value);
} else {
if ($field->get('attribute')) {
if (!$field->get('attribute_name')) {
throw new \InvalidArgumentException("'attribute' parameter required an 'attribute_name' parameter.");
}
$element = $this->dom->createElement($name);
$element->setAttribute($field->get('attribute_name'), $item->getFeedItemLink());
} else {
if ($format = $field->get('date_format')) {
$value = $value->format($format);
}
$element = $this->dom->createElement($name, $value);
}
}
return $element;
}
