code: public static byte[] fromByteString(final String data) {
  		final String[] parts = data.split("\\|");
  		final byte[] bytes = new byte[parts.length];
  
  		for (int i = 0; i < parts.length; ++i) {
  			if (parts[i].length() != Byte.SIZE) {
  				throw new IllegalArgumentException(
  					"Byte value doesn't contain 8 bit: " + parts[i]
  				);
  			}
  
  			try {
  				bytes[parts.length - 1 - i] = (byte)parseInt(parts[i], 2);
  			} catch (NumberFormatException e) {
  				throw new IllegalArgumentException(e);
  			}
  		}
  
  		return bytes;
  	}
docs: Convert a string which was created with the {@link #toByteString(byte...)}
  method back to an byte array.
  
  @see #toByteString(byte...)
  
  @param data the string to convert.
  @return the byte array.
  @throws IllegalArgumentException if the given data string could not be
  converted.