ArgumentsValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Mvc\Controller;

class ArgumentsValidator extends \TYPO3\CMS\Extbase\Validation\Validator\AbstractObjectValidator {

    public function isValid($arguments) {
        if (!$arguments instanceof \TYPO3\CMS\Extbase\Mvc\Controller\Arguments) {
            throw new \InvalidArgumentException('Expected TYPO3\\CMS\\Extbase\\Mvc\\Controller\\Arguments, ' . gettype($arguments) . ' given.', 1241079561);
        }
        $this->errors = array();
        $result = TRUE;
        foreach ($arguments->getArgumentNames() as $argumentName) {
            if ($this->isPropertyValid($arguments, $argumentName) === FALSE) {
                $result = FALSE;
            }
        }
        return $result;
    }

    public function canValidate($object) {
        return $object instanceof \TYPO3\CMS\Extbase\Mvc\Controller\Arguments;
    }

    public function isPropertyValid($arguments, $argumentName) {
        if (!$arguments instanceof \TYPO3\CMS\Extbase\Mvc\Controller\Arguments) {
            throw new \InvalidArgumentException('Expected TYPO3\\CMS\\Extbase\\Mvc\\Controller\\Arguments, ' . gettype($arguments) . ' given.', 1241079562);
        }
        $argument = $arguments[$argumentName];
        $validatorConjunction = $argument->getValidator();
        if ($validatorConjunction === NULL) {
            return TRUE;
        }
        $argumentValue = $argument->getValue();
        if ($argumentValue === $argument->getDefaultValue() && $argument->isRequired() === FALSE) {
            return TRUE;
        }
        if ($validatorConjunction->isValid($argumentValue) === FALSE) {
            $this->addErrorsForArgument($validatorConjunction->getErrors(), $argumentName);
            return FALSE;
        }
        return TRUE;
    }

    protected function addErrorsForArgument(array $errors, $argumentName) {
        if (!isset($this->errors[$argumentName])) {
            $this->errors[$argumentName] = new \TYPO3\CMS\Extbase\Mvc\Controller\ArgumentError($argumentName);
        }
        $this->errors[$argumentName]->addErrors($errors);
    }
}