get_barcode_instance (Barcode_lib)

Factory method that returns the appropriate barcode encoder instance based on the requested barcode type.

	private static function get_barcode_instance($barcode_type='Code128')
	{
		switch($barcode_type)
		{
			case 'Code39':
				return new emberlabs\Barcode\Code39();
				break;

			case 'Code128':
			default:
				return new emberlabs\Barcode\Code128();
				break;

			case 'Ean8':
				return new emberlabs\Barcode\Ean8();
				break;

			case 'Ean13':
				return new emberlabs\Barcode\Ean13();
				break;
		}
	}