Load bundle string (in right language) when value depends on bean condition

Question

I have a Problem with jsf and multiple languages. So my strings are in WEB_INF/classes/texte_<lang>.properties files. And are accessed for example like that <h:outputLabel value="#{messages.err_text}"/> which works fine.

The problem is, i have <h:outputLabel... element where i want to show an error message depending on the error. I would like something that works like this:

<h:outputLabel value="#{someBean.errMsg}/>

With a Bean like that

@ManagedBean()
@SessionScoped
public class SomeBean{
  public String getErrMsg(){
     if(something){
      return "#{messages.err_text}" 
     }else if(somethingElse){
      return "#{messages.err_text2}" 
     }else{
      return "#{messages.err_text3}" 
     }
  }
}

Just to be clear it doesn't work that way. I'm looking for a similar solution (or any solution) that works.
Thanks for reading.

Answer 1

Don't do it that way. The model shouldn't be aware of the view. Localization also doesn't strictly belong in the model. The model should instead prepare some state which the view has to be aware of.

One way would be:

public String getErrMsg(){
    if (something) {
        return "err_text";
    } else if (somethingElse) {
        return "err_text2";
    } else {
        return "err_text3";
    }
}

<h:outputLabel value="#{messages[someBean.errMsg]}" />

Other way would be returning an enum as demonstrated in the following related questions: Localizing enum values in resource bundle and How to use enum values in f:selectItem(s).