Source for file DateVersionConstraint.class.php

<?php
 
require_once HARMONI."dataManager/versionConstraints/VersionConstraint.interface.php";
 
/**
 * Limits pruning based on a cutoff date, specified in the past. The date is passed to the constructor,
 * and can be a specific date or a relative date, like "-2 weeks" or "-12 hours". Dates in the future
 * will throw an error.
 *
 * @package harmoni.datamanager.versionconstraint
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: DateVersionConstraint.class.php,v 1.6 2007/09/04 20:25:33 adamfranco Exp $
 */
class DateVersionConstraint extends VersionConstraint {
    
    var $_cutoffDate;
    
    function DateVersionConstraint( $relativeDateString ) {
        $now = time();
        $relative = strtotime($relativeDateString, $now);
        
        if ($relative === -1) {
            throwError( new Error("DateVersionConstraint: the passed relative date string, '$relativeDateString', does not appear to be valid.","DateVersionConstraint",true));
        }
        
        if ($relativeDateString >= $now) {
            throwError( new Error("DateVersionConstraint: the specified relative date must be in the PAST.", "DateVersionConstraint", true));
        }
        
        $this->_cutoffDate = $relative;
    }
    
    function checkRecordFieldValue($value) {
        foreach ($value->getVersionIDs() as $verID) {
            $ver =$value->getVersion($verID);
            if ($ver->isActive()) continue;
            $date =$ver->getDate();
            $timestamp = $date->toTimestamp();
            
            if ($timestamp < $this->_cutoffDate) {
                $ver->prune();
            }
        }
    }
    
    function checkTags($record) {
        $mgr = Services::getService("RecordTagManager");
        
        $tags =$mgr->fetchTagDescriptors($record->getID());
        
        if ($tags && is_array($tags)) {
            foreach (array_keys($tags) as $id) {
                $date =$tags[$id]->getDate();
                $timestamp = $date->toTimestamp();
                
                if ($timestamp < $this->_cutoffDate) {
                    $mgr->pruneTag($tags[$id]);
                }
            }
        }
    }
    
    function checkRecord($record) {
        // do nothing
        return true;
    }
    
}