Source for file TabAssetIterator.class.php

<?php
/**
* @since 7/20/05
 * @package polyphony.repository_importer
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: TabAssetIterator.class.php,v 1.12 2007/09/19 14:04:48 adamfranco Exp $
 */ 
 
/**
* <##>
 * 
 * @since 7/20/05
 * @package polyphony.repository_importer
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: TabAssetIterator.class.php,v 1.12 2007/09/19 14:04:48 adamfranco Exp $
 */
class TabAssetIterator 
extends HarmoniIterator 
{
    /**
     * Index for iterator
     *
     * @var integer $_current 
     */
     
    var $_current;
    /**
     * Array for Iterator
     *
     * @var array $_assetList 
     */
    var $_assetList;
    
    /**
     * Constructor
     * 
     * @return object 
     * @access public
     * @since 7/20/05
     */
    function TabAssetIterator ($srcDir, $parentRepositoryImporter) {        
        if (Services::serviceRunning("Logging")) {
            $loggingManager = Services::getService("Logging");
            $log =$loggingManager->getLogForWriting("Harmoni");
            $formatType = new Type("logging", "edu.middlebury", "AgentsAndNodes",
                            "A format in which the acting Agent[s] and the target nodes affected are specified.");
            $priorityType = new Type("logging", "edu.middlebury", "Error",
                            "Events involving critical system errors.");
        }            
        if (file_exists($srcDir."metadata.txt") && 
            $meta = fopen($srcDir."metadata.txt", "r")) 
        {
            fgets($meta);
            fgets($meta);
            
            while ($line = ereg_replace("[\n\r]*$","",fgets($meta))) {
                $metadata = explode("\t", $line);
                $this->_assetList[] = $metadata;
            }
            
            if (count($this->_assetList) == 0) {
                $parentRepositoryImporter->addError("There are no assets to import in: ".$srcDir."metadata.txt.");
                if (isset($log)) {
                    $item = new AgentNodeEntryItem("TabImporter Error",
                        "There are no assets to import in: $srcDir/metadata.txt.");
                    $log->appendLogWithTypes($item, $formatType, $priorityType);
                }
            }
            fclose($meta);
                $this->_current = 0;
        }
        else {
            $parentRepositoryImporter->addError("Tab-Delimited parse failed: ".$srcDir."metadata.txt does not exist or is unreadable.");
            if (isset($log)) {
                $item = new AgentNodeEntryItem("TabImporter Error",
                    "Tab-Delimited parse failed: $srcDir/metadata.txt does not exist or is unreadable.");
                $log->appendLogWithTypes($item, $formatType, $priorityType);
            }
        }
    }
    
    /**
     * checks for existence of next element
     * 
     * @return boolean 
     * @access public
     * @since 7/20/05
     */
    function hasNext () {
        if ($this->_current < count($this->_assetList))
            return true;
        else
            return false;
    }
    
    /**
     * returns the next element
     * 
     * @return object DOMIT_Node 
     * @access public
     * @since 7/20/05
     */
    function next() {
        $temp =$this->_assetList[$this->_current];
        $this->_current++;
        return $temp;
    }
}
 
?>