Java Enterprise Best Practices

Create a Simple Interface for Supporting Localization in Business Objects

The LocaleSupport interface, defined in Example 8-11, is arguably an oversimplified version of an interface for handling locales. However, certain components might need to retrieve and/or set the locale, but other components might just need to know how to “find” a user’s preferred locale by looking for a certain key, which in this case is com.ora.bestpractices.j2ee.i18n.USER_PREFERRED_LOCALE.

Example 8-11. LocaleSupport interface

package com.ora.i18n;
   
import java.util.Locale;
   
public interface LocaleSupport {
   
    static final String USER_PREFERRED_LOCALE = "com.ora.bestpractices.j2ee.i18n.USER_
PREFERRED_LOCALE";
    static final Locale APPLICATION_DEFAULT_LOCALE = Locale.getDefault(  );
   
    public void setLocale(Locale inLocale);
    public Locale getLocale(  );
}

The simplicity of this interface underscores the simplicity with which you can start designing your business components to take a locale as appropriate.