BooleanValidator.php

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<?php
namespace TYPO3\CMS\Extbase\Validation\Validator;

class BooleanValidator extends \TYPO3\CMS\Extbase\Validation\Validator\AbstractValidator {

    protected $supportedOptions = array(
        // The default is set to NULL here, because we need to be backward compatible here, because this
        // BooleanValidator is called automatically on boolean action arguments. If we would set it to TRUE,
        // every FALSE value for an action argument would break.
        // TODO with next patches: deprecate this BooleanValidator and introduce a BooleanValueValidator, like
        // in Flow, which won't be called on boolean action arguments.
        'is' => array(NULL, 'Boolean value', 'boolean|string|integer')
    );


    public function isValid($value) {
        // see comment above, check if expectation is NULL, then nothing to do!
        if ($this->options['is'] === NULL) {
            return;
        }
        switch (strtolower((string)$this->options['is'])) {
            case 'true':
            case '1':
                $expectation = TRUE;
                break;
            case 'false':
            case '':
            case '0':
                $expectation = FALSE;
                break;
            default:
                $this->addError('The given expectation is not valid.', 1361959227);
                return;
        }

        if ($value !== $expectation) {
            if (!is_bool($value)) {
                $this->addError('The given subject is not true.', 1361959230);
            } else {
                if ($expectation) {
                    $this->addError('The given subject is not true.', 1361959228);
                } else {
                    $this->addError('The given subject is not false.', 1361959229);
                }
            }
        }
    }

}