code: public static Function<Object,Double> attrOfDouble(final String attributeName) {
          return new Get<Object,Double>(Types.DOUBLE, attributeName);
      }
docs: <p>
  Executes a getter (<tt>getX()</tt>) on the target object which returns Double.
  If the specified attribute is, for example, "<tt>name</tt>", the called method
  will be "<tt>getName()</tt>".
  </p>
  
  @param attributeName the name of the attribute
  @return the result of the method execution