CakePHP ZipComponent

< ?php
class ZipComponent extends Object {
 
	public $zipFile;
	private $zip;
	public $extractDirectory;
 
	public function setFile($zipFile) {
		$this->zipFile = $zipFile;
		$this->zip = new ZipArchive();
	}
 
	public function setExtractDirectory($extractDirectory) {
		$this->extractDirectory = $extractDirectory;
	}
 
	public function extract($zipFile = null, $extractDirectory = null) {
		if (!is_null($zipFile)) {
			$this->setFile($zipFile);
		}
		if (!is_null($extractDirectory)) {
			$this->setExtractDirectory($extractDirectory);
		}
		if ($this->zip->open($this->zipFile)) {
			$this->zip->extractTo($this->extractDirectory);
    		$this->zip->close();
 
    		return true;
		}
 
		return false;
	}
 
}
?>

public $components = array('Zip');
 
public function add() {
    if ($this->Zip->extract($zipFile, $directory)) {
        print 'yes';
    } else {
        print 'no';
    }
}