Re: Enum as a model

Thanks,

it seems that indeed the problem was a null value in one of my model items.

On Tue, May 31, 2011 at 12:58 PM, Daniel Dekany <[email protected]> wrote:

> Tuesday, May 31, 2011, 12:46:11 PM, magic creative wrote:
>
> > The code was to help me clarify the problem. The real code where I
> > am using this has a value set for the enum. However what you are
> > saying is that Freemaker can directly work with enums as model values.
>
> Yes. It doesn't treat them specially (it isn't enum-aware), but it
> handles them just like it handles any other POJO-s. Maybe your
> ObjectWrapper is something special? It should work with any
> BeansWrapper descendants, like with the DefaultObjectWrapper.
>
> > On Tue, May 31, 2011 at 11:02 AM, Daniel Dekany <[email protected]>
> wrote:
> > Tuesday, May 31, 2011, 9:18:51 AM, magic creative wrote:
> >
> >> <code>
> >> //Enum:
> >>
> >> public enum X {
> >>      FIRST, SECOND
> >> }
> >>
> >> //Class:
> >>
> >> public class Y {
> >>
> >>    private X localEnum;
> >>
> >>    public X getLocalEnum(){
> >>       return this.localEnum;
> >>    }
> >>
> >>    void setLocalEnum(X localEnum){
> >>         this.localEnum = localEnum;
> >>    }
> >>
> >> }
> >>
> >> //Insance to serve as model:
> >>
> >> Y yInstance = new Y();
> >>
> >> //Freemaker model:
> >>
> >> Map<String, Object> model = new HashMap<String, Object>();
> >> model.put("yInst", yInstance);
> >>
> >> //Template:
> >>
> >> The value of X in Y: ${yInst.localEnum}
> >>
> >> </code>
> >>
> >> So what I have is a model which contains an enum and I want simply
> >> to show the assigned value.
> >
> > The problem above is that you haven't set the localEnum property, so
> > it's null. So when you write ${yInst.localEnum}, FreeMarker gets null,
> > so it assumes that the property wasn't set (see FAQ). If you add
> >
> >  yInstance.setLocalEnum(X.FIRST);
> >
> > then it will print
> >
> >  The value of X in Y: FIRST
> >
> > --
> > Best regards,
> >  Daniel Dekany
> >
> >
> >
> >> I have read what you have referenced but
> >> I do not see how to apply it to my quite simple case. On the other
> >> hand I read a post where it is written that the problem with enums
> >> is comming from the fact that instead of getName(), they are
> >> reference with name() and thus Freemaker does not recognize that as
> >> property but as function the return value of which it can not
> >> display. I have a hard time however to believe that an enum can not
> >> be used as a model for freemaker, there must be something I have missed.
> >>
> >>
> >> On Mon, May 30, 2011 at 7:17 PM, Daniel Dekany <[email protected]>
> wrote:
> >> Monday, May 30, 2011, 4:19:06 PM, magic creative wrote:
> >>
> >>> Hi guys,
> >>>
> >>>  I can not seem to find an example how to solve my problem so let me
> ask directly.
> >>>
> >>>  If there is an Enum X which is part of an object Y
> >>
> >> What does that mean in Java language?
> >>
> >> BTW, just in case you haven't red this, maybe this helps:
> >> http://freemarker.org/docs/pgui_misc_beanwrapper.html#jdk_15_enums
> >>
> >>> I put as model and I reference X in my template I am getting:
> >>>
> >>>
> >>>
> >>> Expression Y.X is undefined
> >>>
> >>>
> >>> The template has simply ${Y.X}. If X was a String there would be no
> >>> problem and it would be displayed. As an Enum however it does not
> >>> work. What should I do to allow enums to be parsed?
> >>>
> >>> Kind Regards
> >> --
> >> Best regards,
> >>  Daniel Dekany
> >>
> >
>
> --
> Best regards,
>  Daniel Dekany
>
>

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