FileMetadataOverlayAspect.php

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<?php
namespace TYPO3\CMS\Frontend\Aspect;

class FileMetadataOverlayAspect {

    public function languageAndWorkspaceOverlay(\ArrayObject $data) {
        $overlaidMetaData = $data->getArrayCopy();
        $this->getTsfe()->sys_page->versionOL('sys_file_metadata', $overlaidMetaData);
        $overlaidMetaData = $this->getTsfe()->sys_page->getRecordOverlay(
            'sys_file_metadata',
            $overlaidMetaData,
            $this->getTsfe()->sys_language_content,
            $this->getTsfe()->sys_language_contentOL
        );
        if ($overlaidMetaData !== NULL) {
            $data->exchangeArray($overlaidMetaData);
        }
    }

    protected function getTsfe() {
        return $GLOBALS['TSFE'];
    }
}