Magento dataflow adapter class to get file by regex expression and can backup file

Regex.php

<?php

/**
 * Magento Dataflow Adapter Regex Class
 *
 * @author      Vincent Pietri <www.vincent-pietri.fr>
 */
class ADM_Dataflow_Model_Convert_Adapter_Regex extends Mage_Dataflow_Model_Convert_Adapter_Io
{

    public function load(){

        $type  = $this->getVar('type');
        $regex = $this->getVar('regex', null);
        $path  = $this->getVar('path', 'var/import');
        $archivePath  = $this->getVar('archive_path');
        $order  = $this->getVar('order', false);


        //$this->setVar('path', $path);

        if ($type !== 'file') {
            $message = Mage::helper('dataflow')->__('Regex adapter used only for "file" type');
            Mage::throwException($message);
            return;
        }

        if (!$regex) {
            $message = Mage::helper('dataflow')->__('Regex adapter require "regex" key');
            Mage::throwException($message);
        } else {
            $io = new Varien_Io_File();
            if (strpos($path, '/')!==0) {
                $absolutePath = BP . DS . $path;
            } else {
                $absolutePath = $path;
            }

            $io->open(array('path' => $absolutePath));
            $list = $io->ls(Varien_Io_File::GREP_FILES);

            if ($order) {
                usort($list, array($this,'_sortByDescendingDate'));
                if ($order == 'date_asc') {
                    rsort($list);
                }
            }

            foreach ($list as $file) {
                if (preg_match('/'.$regex.'/', $file['text'])) {
                    $this->setVar('filename', $file['text']);
                    parent::load();

                    if ($archivePath) {
                        if (strpos($archivePath, '/')!==0) {
                            $absoluteArchivePath = BP . DS . $archivePath;
                        } else {
                            $absoluteArchivePath = $archivePath;
                        }
                        $io->setAllowCreateFolders(true);
                        try {
                            if ($io->open(array('path' => $absoluteArchivePath))) {
                                if (!$io->mv($absolutePath . DS .$file['text'], $absoluteArchivePath . DS .$file['text'])) {
                                    $message = Mage::helper('dataflow')->__('Cannot move file to "%s".', $absoluteArchivePath);
                                } else {
                                    $message = Mage::helper('dataflow')->__('Backup file to "%s".', $absoluteArchivePath);
                                }
                                $this->addException($message);

                            } else {
                                $message = Mage::helper('dataflow')->__('Cannot open dir "%s".', $absoluteArchivePath);
                                $this->addException($message);
                            }

                        } catch (Exception $e) {
                            $this->addException($e->getMessage());
                        }
                    }
                    return $this;
                }
            }

            $message = Mage::helper('dataflow')->__('No file matching regex %s in "%s"', $regex, $absolutePath);
            Mage::throwException($message);
        }
    }

    /**
     * From newer to older
     *
     * @param array $a
     * @param array $b
     */
    protected function _sortByDescendingDate($a,$b)
    {
        if ($a['mod_date']>$b['mod_date']) {
            return -1;
        } elseif ($a['mod_date']<$b['mod_date']) {
            return 1;
        } else {
            return 0;
        }

    }

}