DigitValidator.php

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<?php
namespace TYPO3\CMS\Form\Validation;

class DigitValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    protected $filter;

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_digit';

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if ($this->filter === NULL) {
                $className = 'TYPO3\\CMS\\Form\\Filter\\DigitFilter';
                $this->filter = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className);
            }
            if ($this->filter->filter($value) !== $value) {
                return FALSE;
            }
        }
        return TRUE;
    }

}