/**
* Instantiate an Input object for the supplied field call setAllowEmpty()
* depending upon whether the field is required.
*
* @param Field $field
* @return Input
*/
protected function instantiateInput(Field $field)
{
$input = new Input($field->getControlName());
if ($field->isRequired() && !$field->isType('boolean')) {
$input->setAllowEmpty(false);
} else {
$input->setAllowEmpty(true);
}
return $input;
}