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File: SetOriginationTimestampTask.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.
 */

GalleryCoreApi::requireOnce('modules/core/AdminMaintenance.inc');

/**
 * This is a MaintenanceTask that will attempt to retrieve and set the
 * origination timestamp for all items (usually from EXIF data).
 *
 * @package GalleryCore
 * @subpackage Classes
 * @author Alan Harder <alan.harder@sun.com>
 * @version $Revision: 15513 $
 */
class SetOriginationTimestampTask extends MaintenanceTask {
    /**
     * @see MaintenanceTask::getInfo
     */
    function getInfo() {
	global $gallery;

	return array('l10Domain' => 'modules_core',
		     'title' => $gallery->i18n('Refresh capture dates'),
		     'description' => $gallery->i18n(
			 'Update capture date stored in Gallery for all items with an available ' .
			 'date in the original data file (usually from EXIF data).'),
		     'confirmRun' => true);
    }

    /**
     * @see MaintenanceTask::run
     */
    function run() {
	global $gallery;
	$templateAdapter =& $gallery->getTemplateAdapter();

	list ($ret, $module) = GalleryCoreApi::loadPlugin('module', 'core');
	if ($ret) {
	    return array($ret, null, null);
	}
	$message = $module->translate('Processing...');

	$templateAdapter->updateProgressBar(
	    $module->translate('Refresh Capture Dates'), $message, '');

	list ($ret, $results) =
	    $gallery->search('SELECT [GalleryDataItem::id] FROM [GalleryDataItem] ' .
			     'ORDER BY [GalleryDataItem::id]');
	if ($ret) {
	    return array($ret, null, null);
	}

	$i = $updated = 0;
	$toolkitMap = array();
	$total = $results->resultCount();
	while ($result = $results->nextResult()) {
	    $gallery->guaranteeTimeLimit(90);
	    /* Grab 5 items at a time */
	    $ids = array($result[0]);
	    for ($j = 0; $j < 4 && ($result = $results->nextResult()); $j++) {
		$ids[] = $result[0];
	    }
	    list ($ret, $items) = GalleryCoreApi::loadEntitiesById($ids);
	    if ($ret) {
		return array($ret, null, null);
	    }
	    foreach ($items as $item) {
		$mimeType = $item->getMimeType();
		if (!isset($toolkitMap[$mimeType])) {
		    list ($ret, $toolkitMap[$mimeType]) =
			GalleryCoreApi::getToolkitsByProperty($mimeType, 'originationTimestamp');
		    if ($ret) {
			return array($ret, null, null);
		    }
		}
		$toolkits = $toolkitMap[$mimeType];
		if (!empty($toolkits)) {
		    list ($ret, $path) = $item->fetchPath();
		    if ($ret) {
			return array($ret, null, null);
		    }
		    foreach ($toolkits as $toolkit) {
			if (!isset($toolkit)) {
			    continue;
			}
			list ($ret, $originationTimestamp) =
			    $toolkit->getProperty($mimeType, 'originationTimestamp', $path);
			if ($ret) {
			    return array($ret, null, null);
			}
			if (is_array($originationTimestamp) && !empty($originationTimestamp[0])) {
			    $item->setOriginationTimestamp($originationTimestamp[0]);
			    if ($item->isModified()) {
				list ($ret, $lockId) =
				    GalleryCoreApi::acquireWriteLock($item->getId());
				if ($ret) {
				    return array($ret, null, null);
				}
				$ret = $item->save();
				if ($ret) {
				    GalleryCoreApi::releaseLocks($lockId);
				    return array($ret, null, null);
				}
				$ret = GalleryCoreApi::releaseLocks($lockId);
				if ($ret) {
				    return array($ret, null, null);
				}
				$updated++;
			    }
			    break;
			}
		    }
		}
		$i++;
	    }

	    $message = $module->translate(
		array('text' => 'Processing item %d of %d', 'arg1' => $i, 'arg2' => $total));
	    $templateAdapter->updateProgressBar($message, '', $i / $total);
	}

	return array(null, true,
		     array($module->translate(array('text' => 'Updated %d of %d items',
						    'arg1' => $updated, 'arg2' => $total))));
    }

    /**
     * @see MaintenanceTask::requiresProgressBar
     */
    function requiresProgressBar() {
	return true;
    }
}
?>