Symfony2 custom Constraint Validation import existing constraints

gistfile1.php

<?php 

use Symfony\Component\Validator\Constraints\Email;
use Symfony\Component\Validator\Constraints\EmailValidator;



class RequireWorkInfoValidator extends ConstraintValidator
{

    public function validate($value, Constraint $constraint)
    {

            if ($value->getEmploymentStatus() == 1) {

                if ( strlen($value->getMainWork()) == 0) {
                    $this->context->addViolationAt('mainWork', $constraint->message, array(), null);
                }

                // $this->context->addViolationAt('mainWork', $constraint->message, array(), null);
                $this->context->addViolationAt('mainWorkDetails', $constraint->message, array(), null);
                $this->context->addViolationAt('phoneWork', $constraint->message, array(), null);

                $emailConstraint = new EmailValidator();

                if( $emailValidator->validate($value->getEmailWork(), new Email()) ) {
                    $this->context->addViolationAt('emailWork', $constraint->message, array(), null);
                } //elseif ( $value->getEmailWork() == '' ) {

               // }


                // $this->context->addViolation($constraint->message);
                return false;
            }

            return true;

    }
}