LessthanValidator.php

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

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

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_lessthan';

    protected $maximum;

    public function __construct($arguments) {
        $this->setMaximum($arguments['maximum']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if ($value >= $this->maximum || !is_numeric($value)) {
                return FALSE;
            }
        }
        return TRUE;
    }

    public function setMaximum($maximum) {
        $this->maximum = $maximum;
        return $this;
    }

    protected function substituteValues($message) {
        $message = str_replace('%maximum', $this->maximum, $message);
        return $message;
    }

}