DownloadExtensionDataViewHelper.php

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<?php
namespace TYPO3\CMS\Extensionmanager\ViewHelpers;

class DownloadExtensionDataViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Link\ActionViewHelper {

    protected $tagName = 'a';

    public function render($extension) {
        $filePrefix = PATH_site . $extension['siteRelPath'];
        if (!file_exists(($filePrefix . 'ext_tables.sql')) && !file_exists(($filePrefix . 'ext_tables_static+adt.sql'))) {
            return '';
        }
        $uriBuilder = $this->controllerContext->getUriBuilder();
        $uriBuilder->reset();
        $uri = $uriBuilder->uriFor('downloadExtensionData', array(
            'extension' => $extension['key']
        ), 'Action');
        $this->tag->addAttribute('href', $uri);
        $cssClass = 'downloadExtensionData';
        $this->tag->addAttribute('class', $cssClass);
        $this->tag->addAttribute('title', \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate('extensionList.downloadsql', 'extensionmanager'));
        $this->tag->setContent(\TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIcon('actions-system-extension-sqldump'));
        return $this->tag->render();
    }

}