Question 41812 in PHP Question posted in
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Override class noted "final" in vendor – PHP

I want to override a class from the JMS/serializer bundle. Unfortunately this class is marked "final" and I can’t override it. What would be the best method to circumvent this problem please?
I’m on symfony5.4

Here is the class I want to override :

<?php

declare(strict_types=1);

namespace JMSSerializerHandler;

use JMSSerializerGraphNavigatorInterface;
use JMSSerializerVisitorSerializationVisitorInterface;
use JMSSerializerXmlSerializationVisitor;
use SymfonyComponentFormForm;
use SymfonyComponentFormFormError;
use SymfonyComponentFormFormInterface;
use SymfonyComponentTranslationTranslatorInterface;
use SymfonyContractsTranslationTranslatorInterface as TranslatorContract;

use function get_class;

 final class FormErrorHandler implements SubscribingHandlerInterface
{
    /**
     * @var TranslatorInterface|null
     */
    private $translator;

    /**
     * @var string
     */
    private $translationDomain;
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2

Answers


  1. Chosen as BEST ANSWER
    0

    I finally found a solution. I overridden the FormErrorHandler class from FOS/SerializerbUndle and then I overridden the formErrorHandlere class from JMS which I call in my overload of FOS/FormErrorHandler. it works perfectly


  2. 0

    The short answer is that you can not override the final classes as long as the package author does not provide a functionality to replace the final class with a custom implmentation.

    by taking a look at the source code of the package, you can do so. the SerializeBuilder constructor is something like:

    public function __construct(?HandlerRegistryInterface $handlerRegistry = null, ?EventDispatcherInterface $eventDispatcher = null)

    which clearly means that you can add your custom handler.

    and due to the documentation you can implement your own handler easily.

    $builder
    ->configureHandlers(function(JMSSerializerHandlerHandlerRegistry $registry) {
        $registry->registerSubscribingHandler(new MyHandler());
    })
;
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