public function getUniqueFilename()
	{
		$pathInfo = pathinfo($this->filename);
		$filename = $pathInfo['filename'];
		$extension = $pathInfo['extension'];
		$increment = 1;
		while($this->fileExists($filename . "_" . $increment, $extension))
		{
			$increment++;
		}
		$this->filename = $filename . "_" . $increment . '.' . $extension;

		return $this;
	}