Neos\Flow\Validation\ValidatorResolver::addCustomValidators PHP Method

    protected function addCustomValidators($targetClassName, ConjunctionValidator &$conjunctionValidator)
    {
        // Custom validator for the class
        $addedValidatorClassName = null;
        $possibleValidatorClassName = str_replace('\\Model\\', '\\Validator\\', $targetClassName) . 'Validator';
        $customValidator = $this->createValidator($possibleValidatorClassName);
        if ($customValidator !== null) {
            $conjunctionValidator->addValidator($customValidator);
            $addedValidatorClassName = get_class($customValidator);
        }
        // find polytype validator for class
        $acceptablePolyTypeValidators = [];
        $polyTypeObjectValidatorImplementationClassNames = static::getPolyTypeObjectValidatorImplementationClassNames($this->objectManager);
        foreach ($polyTypeObjectValidatorImplementationClassNames as $validatorImplementationClassName) {
            $acceptablePolyTypeValidator = $this->createValidator($validatorImplementationClassName);
            // skip custom validator already added above
            if ($addedValidatorClassName === get_class($acceptablePolyTypeValidator)) {
                continue;
            }
            if ($acceptablePolyTypeValidator->canValidate($targetClassName)) {
                $acceptablePolyTypeValidators[$acceptablePolyTypeValidator->getPriority()] = $acceptablePolyTypeValidator;
            }
        }
        if (count($acceptablePolyTypeValidators) > 0) {
            ksort($acceptablePolyTypeValidators);
            $conjunctionValidator->addValidator(array_pop($acceptablePolyTypeValidators));
        }
    }