code: private static Pair keyValue(final String line) {
  
  		final String[] parts = line.split("=", 2);
  
  		if (parts.length == 2) {
  
  			final String key   = parts[0].trim();
  			final String value = parts[1].trim();
  
  			return new Pair(key, value);
  		}
  
  		// ignore invalid lines
  		return null;
  	}
docs: ----- private static members -----