Re: how to make freeMarker simply call toString?

Thank you for fast reply, Daniel!

>What will consume that template output? The toString() of arbitrary
>objects is meaningless for users (non-developer human beings) for
>sure. It's also useless for other programs, as it's not even possible
>to write code that reliably extracts data from the toString() of
>standard collections and maps, as they don't quote the items or
>anything like that. It's only good for debugging. Do you need this for
>debugging maybe?

I forgot to mention one case in my displaying algorithm (i marked it with
bold below)

When I have an expression ${someObject.someFieldOrPropertOrMethod} to be
displayed
in case it returns a primitive i want it to be cast to String via it's
Wrapper class (Boolean, Float, etc)
in case it is an object that overrides Object's toString() I want it to be
displayed as a result of toString() execution.
in case it is a sequence that does not override toString() (e.g array,
list, set) I want it to be displayed as
[value1.toString,...,valueN.toString]
in case it is a Map that does not override toString I want it to be
displayed as [{key1.toString(),value1.toString()..., ]
*in case it is an object that doesn't override toString() and none of the
above(not a collection, array,map) it will be displayed as "¿"*


I'm already digging in BeansWrapper
am I right that in I want objects that do not override toString methods
return a * "¿", *i need to provide a StringModel for them
instantiated as  modelCache.getInstance(object, StringModel.FACTORY)?

Do I need to override public Object unwrap(TemplateModel model, Class hint)?

Regards,
Vitaliy










On Mon, Mar 31, 2014 at 1:59 AM, Daniel Dekany <[email protected]> wrote:

> Sunday, March 30, 2014, 9:38:35 PM, Vitaliy Semochkin wrote:
>
> > Hello Dánie,
> >
> > You advise works great, thank you very much for the fast response!
> >
> > As for your question, I need it because I do not know the types of
> > variablles that arrive to my template.
>
> What will consume that template output? The toString() of arbitrary
> objects is meaningless for users (non-developer human beings) for
> sure. It's also useless for other programs, as it's not even possible
> to write code that reliably extracts data from the toString() of
> standard collections and maps, as they don't quote the items or
> anything like that. It's only good for debugging. Do you need this for
> debugging maybe?
>
> > My only option to display it is to follow the rule:
> > When I have an expression ${someObject.someFieldOrPropertOrMethod} to be
> displayed
> > in case it returns a primitive i want it to be cast to String via
> > it's Wrapper class (Boolean, Float, etc)
> > in case it is an object that overrides Object's toString() I want
> > it to be displayed as a result of toString() execution.
> > in case it is a sequence that does not override toString() (e.g
> > array, list, set) I want it to be displayed as
> > [value1.toString,...,valueN.toString]
> > in case it is a Map that does not override toString I want it to be
> > displayed as [{key1.toString(),value1.toString()..., ]
> >
> > Am I right that all I need to do, is to override BeansWrapper?
>
> Yes, to ensure that all wrapped values that you want to print and
> isn't a TemplateNumberModel or TemplateBooleanModel or
> TemplateDateModel implements TemplateScalarModel, in the way that you
> prefer, you will have to do that. Now, BeansWrapper is a quite complex
> beast, so I'm not sure if it will be easy or not...
>
> > Once again, thank you very much for supporting this great project
> > and for a lighting fast response on Sunday
> >
> > Regards,
> > Vitaliy
> >
> >
> >
> >
> >
> >
> > On Sun, Mar 30, 2014 at 6:35 PM, Daniel Dekany <[email protected]>
> wrote:
> > Hello,
> >
> > The way it works currently is that if FreeMarker doesn't know how to
> > make string out of a value (an FTL sequence or FTL hash in your case),
> > it will check if the *wrapped* value (which is made by the
> > ObjectWrapper from the plain Java object) implements
> > TemplateScalarModel, and if it does, it will use that to generate the
> > text to print. So, everything is possible with a custom ObjectWrapper.
> >
> > As of how to achieve this with an out-of-the box object wrapper...
> > BeansWrapper does this if you don't
> > beansWrapper.setSimpleMapWrapper(true) it, except for arrays, but the
> > toString output of arrays is useless anyway. However, I wouldn't
> > recommend setSimpleMapWrapper(false), because it mixes the method
> > names with the keys in the map, which can get quite confusing.
> >
> > But maybe I can give a better answer (or an RFE...) if I know why is
> > this needed. So why?
> >
> > --
> > Thanks,
> >  Daniel Dekany
> >
> >
> > Sunday, March 30, 2014, 12:16:07 PM, Vitaliy Semochkin wrote:
> >
> >> Hello,
> >>
> >> I want to configure Freemarker
> >> in order to make it replace
> >>
> >> every ${object}, ${object.someField}, ${object.someMethod()}
> >> in my template with a toString value for the returned object.
> >> Even if it is an array, list, map or collection.
> >>
> >> How to configure freemarkert in order to do so?
> >>
> >> Regards,
> >> Vitaliy
> >>
> >
> >
>
> --
> Thanks,
>  Daniel Dekany
>
>

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