[cai18n-dev] Type safe message definition

[Ceki Gulcu]

Hello Takeshi,

LocalizedColors and ColorDef_* show that it is possible to do
localization without resource bundles. Is that the main point, or is
there something else?

The syntax of LocalizedColors is more verbose than what you would have
with a simple enum + resource bundles. Actually, the syntax is
overwhelmingly noisy to be useful, or I may be just missing the
point. :-)

The syntax of MessageDeclaration based enums is much better but still
more verbose than the enum + resource bundles
combination. MessageDefinitionConveyor demonstrates that an enum-only
(or Java code only) implementation of IMessageConveyor is
possible. But from a practical point of view, resource bundles are
more convenient. Wouldn't you agree?

In any case, thank you for sharing your ideas. They are well
appreciated.



Takeshi Kondo wrote:
> Hi Ceki
> 
> I have two type safe message definition idea.
> I've committed draft code to my cai18n project clone.
> (http://github.com/takeshi/cai18n/tree/master)
> Please take it in cai18n project, if you like it,.
> 
> My ideas is as follows.
> 
> 1. Message definition by annotation
> 
> for instance,
> 
> public enum LocalizedColors {
> 
>     @Message("green")
>     GREEN {
>         @Message("vert")
>         Locale fr = Locale.FRANCE;
> 
>         @Message("midori")
>         Locale ja = Locale.JAPAN;
>     }
> }
> 
> Using enum field declaration with annotation, we can define localized 
> message. It is simple , but we can't add other locale.
> 
> 2. Message definition by switch case
> 
> for instance,
> 
> public class ColorDef_fr extends MessageDefinition<Colors> {
>     public Locale getLocale() {
>         return Locale.FRANCE;
>     }
> 
>     public String getMessage(Colors e) {
>         switch (e) {
>         case BLUE:
>             return "blue";
>         case GREEN:
>             return "vert";
>         case RED:
>             return "rouge";
>         }
>         return null;
>     }
> }
> 
> Using method return, we can define localized message.
> It is not simple, but this we can define it per 
> locale._______________________________________________
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-- 
Ceki Gülcü
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