/**
  * @return \Opg\Common\Model\Entity\Traits\InputFilter|\Zend\InputFilter\InputFilter|\Zend\InputFilter\InputFilterInterface
  */
 public function getInputFilter()
 {
     if (!$this->inputFilter) {
         $this->inputFilter = parent::getInputFilter();
         $this->inputFilter->merge(new ClientFilter());
     }
     return $this->inputFilter;
 }