MediaceExtractionUpdate.php

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

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

class MediaceExtractionUpdate extends AbstractDownloadExtensionUpdate
{
    protected $title = 'Installs extension "mediace" from TER if media elements are used.';

    protected $extensionKey = 'mediace';

    protected $extensionDetails = [
        'mediace' => [
            'title' => 'Media Content Element',
            'description' => 'The media functionality from TYPO3 6.2 and earlier can be found here. This extension provides ContentObjects and Content Elements.',
            'versionString' => '7.6.0',
        ]
    ];

    public function checkForUpdate(&$description)
    {
        $updateNeeded = true;

        if ($this->isWizardDone() || ExtensionManagementUtility::isLoaded('mediace')) {
            $updateNeeded = false;
        } else {
            $amountOfMediaElements = $this->getDatabaseConnection()->exec_SELECTcountRows(
                'uid',
                'tt_content',
                'CType IN (\'media\', \'multimedia\') AND deleted=0'
            );

            if ($amountOfMediaElements === 0) {
                $updateNeeded = false;
            }
        }

        $description = 'The extension "mediace" (Media Content Element) was extracted into the TYPO3 Extension Repository. ' .
            'This update checks if media content elements are used and downloads the TYPO3 Extension from the TER.';

        return $updateNeeded;
    }

    public function performUpdate(array &$databaseQueries, &$customMessages)
    {
        $updateSuccessful = $this->installExtension($this->extensionKey, $customMessages);
        if ($updateSuccessful) {
            $this->markWizardAsDone();
        }
        return true;
    }
}