RE: [FreeMarker-user] FW: crud screens and null.

[Payne, M. <Pay...@pe...>]

Re:=20

You can use (really.long.property.chain)?default("...") - note the =20
parentheses around the property chain - to fall back to a default when =20
*any* part of the property chain is missing, not only the last =
component.


Didn't know that could be used against a whole chain.
e.g.=20
${(really.long.property.chain)?default("...")}

That may help, thanks for your help and samples.  Its not looking as bad =
as I thought.

-Matt

 -----Original Message-----
From: 	fre...@li... =
[mailto:fre...@li...]  On Behalf Of =
Attila Szegedi
Sent:	Tuesday, May 02, 2006 10:41 AM
To:	fre...@li...
Subject:	Re: [FreeMarker-user] FW: crud screens and null.

On Mon, 01 May 2006 22:58:39 +0200, Payne, Matthew =20
<Pay...@pe...> wrote:

>
> Does freemarker support a "!" notation?
> .default("") is not quite the same thing if the property or its parent =
=20
> object does not exist, but its okay.

You can use (really.long.property.chain)?default("...") - note the =20
parentheses around the property chain - to fall back to a default when =20
*any* part of the property chain is missing, not only the last =
component.

You can also enclose your template (at least in that "edit" mode) with

<#escape x as (x)?default("...")>
   ...
</#escape>

and have each expression "expr" occurring inside ${} (that is, ${expr}) =
be =20
transformed into ${(expr)?default("...")} inside the <#escape> block.

Oh, and as an alternative to all of that, you can create a nice little =20
model for your "edit" and "preview" views that'll actually cause the =20
template to print all expressions - just toss an object of the class =
below =20
as a root model in your template.process():

-------------------------------------------------------------
public class FakeModel
implements TemplateScalarModel, TemplateBooleanModel,
TemplateHashModel, TemplateSequenceModel, TemplateMethodModel
{
     private final String text;

     public FakeModel()
     {
         this("");
     }

     public FakeModel(String text)
     {
         this.text =3D text;
     }

     public String getAsString()
     {
         return "${" + text + "}";
     }

     public boolean getAsBoolean()
     {
         return true;
     }

     public TemplateModel get(String key)
     {
         return new FakeModel(text + "." + key);
     }

     public TemplateModel get(int index)
     {
         return new FakeModel(text + "[" + index + "]");
     }

     public boolean isEmpty()
     {
         return false;
     }

     public int size()
     {
         return 1;
     }

     public TemplateModel exec(List args) throws TemplateModelException
     {
         return new FakeModel(text + args.toString().replace('[', =20
'(').replace(']', ')'));
     }
}
-------------------------------------------------------------

Cheers,
   Attila.

--=20
home: http://www.szegedi.org
weblog: http://constc.blogspot.com


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