RecyclerGarbageCollectionAdditionalFieldProvider.php

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<?php
namespace TYPO3\CMS\Scheduler\Task;

class RecyclerGarbageCollectionAdditionalFieldProvider implements \TYPO3\CMS\Scheduler\AdditionalFieldProviderInterface {

    protected $defaultNumberOfDays = 30;

    public function getAdditionalFields(array &$taskInfo, $task, \TYPO3\CMS\Scheduler\Controller\SchedulerModuleController $parentObject) {
        // Initialize selected fields
        if (!isset($taskInfo['scheduler_recyclerGarbageCollection_numberOfDays'])) {
            $taskInfo['scheduler_recyclerGarbageCollection_numberOfDays'] = $this->defaultNumberOfDays;
            if ($parentObject->CMD === 'edit') {
                $taskInfo['scheduler_recyclerGarbageCollection_numberOfDays'] = $task->numberOfDays;
            }
        }
        $fieldName = 'tx_scheduler[scheduler_recyclerGarbageCollection_numberOfDays]';
        $fieldId = 'task_recyclerGarbageCollection_numberOfDays';
        $fieldValue = (int)$taskInfo['scheduler_recyclerGarbageCollection_numberOfDays'];
        $fieldHtml = '<input type="text" name="' . $fieldName . '" id="' . $fieldId . '" value="' . htmlspecialchars($fieldValue) . '" />';
        $additionalFields[$fieldId] = array(
            'code' => $fieldHtml,
            'label' => 'LLL:EXT:scheduler/mod1/locallang.xlf:label.recyclerGarbageCollection.numberOfDays',
            'cshKey' => '_MOD_system_txschedulerM1',
            'cshLabel' => $fieldId
        );
        return $additionalFields;
    }

    public function validateAdditionalFields(array &$submittedData, \TYPO3\CMS\Scheduler\Controller\SchedulerModuleController $parentObject) {
        $result = TRUE;
        // Check if number of days is indeed a number and greater or equals to 0
        // If not, fail validation and issue error message
        if (!is_numeric($submittedData['scheduler_recyclerGarbageCollection_numberOfDays']) || (int)$submittedData['scheduler_recyclerGarbageCollection_numberOfDays'] < 0) {
            $result = FALSE;
            $parentObject->addMessage($GLOBALS['LANG']->sL('LLL:EXT:scheduler/mod1/locallang.xlf:msg.invalidNumberOfDays'), \TYPO3\CMS\Core\Messaging\FlashMessage::ERROR);
        }
        return $result;
    }

    public function saveAdditionalFields(array $submittedData, \TYPO3\CMS\Scheduler\Task\AbstractTask $task) {
        $task->numberOfDays = (int)$submittedData['scheduler_recyclerGarbageCollection_numberOfDays'];
    }

}