code: public static Double positiveDouble(String value) {
  		Double doubleValue = Validate.isDouble(value);
  		positive(doubleValue);
  		return doubleValue;
  	}
docs: Checks if the given String is a positive double value.<br>
  This method tries to parse a double value and then checks if it is bigger than 0.
  @param value The String value to validate.
  @return The parsed double value
  @throws ParameterException if the given String value cannot be parsed as double or its value is smaller or equal to 0.