/**
  * Returns the target filename for this task.
  *
  * @return string
  */
 public function getTargetFileName()
 {
     return 'preview_' . parent::getTargetFilename();
 }
 /**
  * @return string
  */
 public function getTargetFileName()
 {
     return 'csm_' . parent::getTargetFilename();
 }