/**
  * {@inheritdoc}
  */
 protected function setDefaultOptions(OptionsResolverInterface $resolver)
 {
     parent::setDefaultOptions($resolver);
     $resolver->setRequired(array('channel_label_row', 'attribute_label_row', 'attribute_data_row', 'code_row', 'code_column', 'labels_column', 'labels_label_row', 'labels_data_row', 'labels_column'));
 }
 /**
  * {@inheritdoc}
  */
 protected function setDefaultOptions(OptionsResolverInterface $resolver)
 {
     parent::setDefaultOptions($resolver);
     $resolver->setDefaults(array('skip_empty' => false, 'label_row' => 1, 'data_row' => 2));
 }