/**
* @param DataUnitComponentInterface $input
* @param FormState $state
* @return null|string
*/
protected function readInput(DataUnitComponentInterface $input, FormState $state)
{
// only load input value if it actually was set
if ($state->hasInput($input->getFullName())) {
return $this->preprocessInputValue($input, $state->getInput($input->getFullName()));
}
return null;
}
