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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace SLLH\IsoCodesValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SLLH\IsoCodesValidator\Constraints\IsoCodesGeneric;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SLLH\IsoCodesValidator\Constraints\IsoCodesGenericValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SLLH\IsoCodesValidator\Exception\ValidatorNotExistsException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Validator\Constraint;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Validator\ConstraintValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Validator\Context\ExecutionContext;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Validator\Context\ExecutionContextInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Validator\Exception\UnexpectedTypeException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Sullivan Senechal <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                abstract class AbstractIsoCodesConstraintValidator extends ConstraintValidator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Override PHP doc block to get IDE completion.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Can be removed when `buildViolation` would be added on ExecutionContextInterface.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Should probably done in Symfony 3.0.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ExecutionContextInterface|ExecutionContext  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $context;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function validate($value, Constraint $constraint)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $validatorClass = get_class($this);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (IsoCodesGenericValidator::class === $validatorClass  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            && !($constraint instanceof AbstractIsoCodesGenericConstraint || $constraint instanceof IsoCodesGeneric)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            throw new UnexpectedTypeException($constraint, AbstractIsoCodesGenericConstraint::class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        } elseif (IsoCodesGenericValidator::class !== $validatorClass) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $constraintClass = preg_replace('/Validator$/', '', $validatorClass); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if (!$constraint instanceof $constraintClass) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                throw new UnexpectedTypeException($constraint, $constraintClass);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (!class_exists($constraint->getIsoCodesClass())) { | 
            
                            
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                            throw new ValidatorNotExistsException($constraint);  | 
            
                            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Makes and adds a Constraint violation.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $message  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function createViolation($message)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->context->buildViolation($message)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->addViolation();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: