NotEmptyValidator.php

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

class NotEmptyValidator extends AbstractValidator {

    protected $acceptsEmptyValues = FALSE;

    public function isValid($value) {
        if ($value === NULL) {
            $this->addError(
                $this->translateErrorMessage(
                    'validator.notempty.null',
                    'extbase'
                ), 1221560910);
        }
        if ($value === '') {
            $this->addError(
                $this->translateErrorMessage(
                    'validator.notempty.empty',
                    'extbase'
                ), 1221560718);
        }
        if (is_array($value) && empty($value)) {
            $this->addError(
                $this->translateErrorMessage(
                    'validator.notempty.empty',
                    'extbase'
                ), 1347992400);
        }
        if (is_object($value) && $value instanceof \Countable && $value->count() === 0) {
            $this->addError(
                $this->translateErrorMessage(
                    'validator.notempty.empty',
                    'extbase'
                ), 1347992453);
        }
    }
}