StatusUtility.php

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<?php
namespace TYPO3\CMS\Install\Status;

class StatusUtility {

    public function sortBySeverity(array $statusObjects = array()) {
        $orderedStatus = array(
            'alert' => $this->filterBySeverity($statusObjects, 'alert'),
            'error' => $this->filterBySeverity($statusObjects, 'error'),
            'warning' => $this->filterBySeverity($statusObjects, 'warning'),
            'ok' => $this->filterBySeverity($statusObjects, 'ok'),
            'information' => $this->filterBySeverity($statusObjects, 'information'),
            'notice' => $this->filterBySeverity($statusObjects, 'notice'),
        );
        return $orderedStatus;
    }

    public function filterBySeverity(array $statusObjects = array(), $severity = 'ok') {
        $filteredObjects = array();
        foreach ($statusObjects as $status) {
            if (!$status instanceof StatusInterface) {
                throw new Exception(
                    'Object must implement StatusInterface',
                    1366919442
                );
            }
            if ($status->getSeverity() === $severity) {
                $filteredObjects[] = $status;
            }
        }
        return $filteredObjects;
    }
}