FlashMessageContainer.php

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<?php
namespace TYPO3\CMS\Extbase\Mvc\Controller;

class FlashMessageContainer implements \TYPO3\CMS\Core\SingletonInterface {

    protected $controllerContext;

    public function setControllerContext(\TYPO3\CMS\Extbase\Mvc\Controller\ControllerContext $controllerContext) {
        $this->controllerContext = $controllerContext;
    }

    public function add($message, $title = '', $severity = \TYPO3\CMS\Core\Messaging\FlashMessage::OK) {
        \TYPO3\CMS\Core\Utility\GeneralUtility::logDeprecatedFunction();
        if (!is_string($message)) {
            throw new \InvalidArgumentException(
                'The flash message must be string, ' . gettype($message) . ' given.',
                1243258396
            );
        }
        $flashMessage = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
            'TYPO3\\CMS\\Core\\Messaging\\FlashMessage', $message, $title, $severity, TRUE
        );
        $this->controllerContext->getFlashMessageQueue()->enqueue($flashMessage);
    }

    public function getAllMessages() {
        \TYPO3\CMS\Core\Utility\GeneralUtility::logDeprecatedFunction();
        return $this->controllerContext->getFlashMessageQueue()->getAllMessages();
    }

    public function flush() {
        \TYPO3\CMS\Core\Utility\GeneralUtility::logDeprecatedFunction();
        $this->controllerContext->getFlashMessageQueue()->getAllMessagesAndFlush();
    }

    public function getAllMessagesAndFlush() {
        \TYPO3\CMS\Core\Utility\GeneralUtility::logDeprecatedFunction();
        return $this->controllerContext->getFlashMessageQueue()->getAllMessagesAndFlush();
    }
}