code: public void setValue(String attributeName, Object value) {
          if (attributeName == null || value == null) {
              throw new NullPointerException();
          }
          values.put(attributeName, value);
      }
docs: <p>
  Sets the value for the named attribute.
  </p>
  
  @param attributeName
  The name of the attribute to set a value with.
  @param value
  The value to set.