EqualsValidator.php

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

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

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_equals';

    protected $field;

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

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            if (!$this->requestHandler->has($this->field)) {
                return FALSE;
            } else {
                $value = $this->requestHandler->getByMethod($this->fieldName);
                $comparisonValue = $this->requestHandler->getByMethod($this->field);
                if ($value !== $comparisonValue) {
                    return FALSE;
                }
            }
        }
        return TRUE;
    }

    public function setField($field) {
        $this->field = (string) $field;
        return $this;
    }

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

}