Internationalization of multiple enums (translation of enum values) [duplicate]

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我在风中等你

2021-01-14 23:59

What about:

public interface InternationalizationOfEnum {
default String getKey() {
      return EnumTranslator.getMessageKey(this);
    }
String name();}

and

public enum anyEnum implements InternationalizationOfEnum{

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鱼传尺愫

2021-01-15 00:05
I would make an EL function, leaving the enum classes as they are:
```
#{l:xlate(order.transferStatus)}
```
Okay, xlate has an Object parameter then (or Enum<?>). But the enum classes stay as they are.
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闹比i

2021-01-15 00:08

The way I'd be doing this takes a bit more code (but far less than the other answers I've seen here), but I feel is more reliable:

@ManagedBean
@ApplicationScoped
public class EnumTranslator {

    private <E extends Enum<E>> Map<E, String> getPresentableNames(Class<E> enumClass) {
        ResourceBundle resources = ResourceBundle.getBundle(
            "com.example.app.MyMessageBundle",
            FacesContext.getCurrentInstance().getViewRoot().getLocale());

        String prefix = enumClass.getSimpleName() + ".";

        Map<E, String> map = new EnumMap<E, String>(enumClass);
        for (E value : enumClass.getEnumConstants()) {
            map.put(value, resources.getString(prefix + value));
        }

        return map;
    }

    // Bean method, accessible via EL
    public Map<?, ?> getTransferStatuses() {
        return getPresentableNames(TransferStatus.class);
    }
}

Then your page can do:

<h:outputText value="#{enumTranslator.transferStatuses[order.transferStatus]}" />

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我寻月下人不归

2021-01-15 00:14

Ok, now this is the complete and ready-to-use solution: (thanks to @Joop Eggen)

Make a class

public final class EnumTranslator {
  public static String getMessageKey(Enum<?> e) {
    return e.getClass().getSimpleName() + '.' + e.name();
  }
}

Make it a custom EL function

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib 
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
version="2.0">
<namespace>http://example.com/enumi18n</namespace>
<function>
    <function-name>xlate</function-name>
    <function-class>your.package.EnumTranslator</function-class>
    <function-signature>String getMessageKey(java.lang.Enum)</function-signature>
</function>
</facelet-taglib>

Add the taglib to your web.xml

<context-param>
    <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
    <param-value>/WEB-INF/enumi18n.taglib.xml</param-value>
</context-param>

Have properties files enum_en.properties and enum_yourlanguage.properties like this

TransferStatus.NOT_TRANSFERRED = Not transferred
TransferStatus.TRANSFERRED = Transferred

Add the properties files as resource bundles to your faces-config.xml

    <resource-bundle>
        <base-name>kk.os.obj.jsf.i18n.enum</base-name>
        <var>enum</var>
    </resource-bundle>

Add the custom taglib to your xhtml files

<html ... xmlns:l="http://example.com/enumi18n">

And - voilà - you can now access the translated enum values in jsf:

<h:outputText value="#{enum[l:xlate(order.transferStatus)]}" />

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