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File: PanoramaUpgradeHelper.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2007 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * A helper class for the upgrading Panorama module.
 * @package Panorama
 * @subpackage Classes
 * @author Alan Harder <alan.harder@sun.com>
 * @version $Revision: 15513 $
 * @static
 */
class PanoramaUpgradeHelper {

    /**
     * Switch back from using PanoramaPhotoItem and PanoramaDerivativeImage to
     * the base classes, now that we're using renderers.  This can get deleted
     * after GalleryCoreApi moves to 8.x because we're doing the same thing in
     * the core module.
     *
     * NOTE: If you change this code, you should update the matching block
     * in modules/core/CoreModuleExtras.inc
     *
     * @return object GalleryStatus a status code
     */
    function revertEntities() {
	global $gallery;

	$query = '
	  SELECT
	    [GalleryEntity::id], [GalleryEntity::entityType]
	  FROM
	    [GalleryEntity]
	  WHERE
	    [GalleryEntity::entityType] IN (\'PanoramaPhotoItem\', \'PanoramaDerivativeImage\')
	';
	list ($ret, $searchResults) = $gallery->search($query, array());
	if ($ret) {
	    return $ret;
	}
	if (!$searchResults->resultCount()) {
	    return null;
	}

	$photos = array();
	$derivatives = array();
	while ($result = $searchResults->nextResult()) {
	    $gallery->guaranteeTimeLimit(30);
	    if ($result[1] == 'PanoramaPhotoItem') {
		$photos[] = $result[0];
	    } else {
		$derivatives[] = $result[0];
	    }
	}

	$storage =& $gallery->getStorage();

	/* Switch PanoramaPhotoItems back to GalleryPhotoItems */
	while ($photos) {
	    $ids = array_splice($photos, 0, 500);
	    $markers = GalleryUtilities::makeMarkers($ids);
	    $query = "UPDATE [GalleryItem] SET [::renderer] = 'PanoramaRenderer' " .
		"WHERE [GalleryItem::id] IN ($markers)";
	    $ret = $storage->execute($query, $ids);
	    if ($ret) {
		return $ret;
	    }

	    $query = "UPDATE [GalleryEntity] SET [::entityType] = 'GalleryPhotoItem' " .
		"WHERE [GalleryEntity::id] IN ($markers)";
	    $ret = $storage->execute($query, $ids);
	    if ($ret) {
		return $ret;
	    }
	}

	/* Switch PanoramaDerivativeImage back to GalleryDerivativeImage */
	while ($derivatives) {
	    $ids = array_splice($derivatives, 0, 500);
	    $markers = GalleryUtilities::makeMarkers($ids);
	    $query = "UPDATE [GalleryEntity] SET [::entityType] = 'GalleryDerivativeImage' " .
		"WHERE [GalleryEntity::id] IN ($markers)";
	    $ret = $storage->execute($query, $ids);
	    if ($ret) {
		return $ret;
	    }
	}

	/*
	 * Flush the entity cache because we've changed types
	 * Swallow any errors here; they're going to be recoverable.
	 * @todo Refactor this together with the code from the upgrader
	 */
	$cacheBaseDir = $gallery->getConfig('data.gallery.cache');
	$platform =& $gallery->getPlatform();
	@$platform->recursiveRmDir("$cacheBaseDir/entity");

	return null;
    }
}
?>