/**
* Returns a string representation of the constraint.
*
* @return string
*/
public function toString()
{
switch (get_class($this->constraint)) {
case 'PHPUnit_Framework_Constraint_And':
case 'PHPUnit_Framework_Constraint_Not':
case 'PHPUnit_Framework_Constraint_Or':
return 'not( ' . $this->constraint->toString() . ' )';
break;
default:
return PHPUnit_Framework_Constraint::negate($this->constraint->toString());
}
}