public class GenericEnumConverter extends Object implements Converter
UISelectMany components whose value is been bound to a
List<T> property. Even though JSF has already a builtin EnumConverter, this doesn't work
for a List<T> property as the generic type infomation T is lost during runtime. The
list would be filled with unconverted String values instead which may in turn cause
ClassCastException.
If replacing the List<T> property by a T[] (e.g. Role[] in case of a
Role enum) is not an option due to design restrictions (e.g. JPA @ElementCollection, etc),
then you'd need to create an explicit converter for the enum type like follows:
@FacesConverter(value="roleConverter")
public class RoleConverter extends EnumConverter {
public RoleConverter() {
super(Role.class);
}
}
However, creating a new converter for every single enum type, only and only for use in UISelectMany with a
List<T> property, may be a bit clumsy. This generic enum converter is intented to remove the need
to create a new enum converter everytime.
This converter is available by converter ID omnifaces.GenericEnumConverter. Basic usage example:
<h:selectManyCheckbox value="#{bean.selectedEnums}" converter="omnifaces.GenericEnumConverter">
<f:selectItems value="#{bean.availableEnums}" />
</h:selectManyCheckbox>
| Constructor and Description |
|---|
GenericEnumConverter() |
| Modifier and Type | Method and Description |
|---|---|
Object |
getAsObject(FacesContext context,
UIComponent component,
String submittedValue) |
String |
getAsString(FacesContext context,
UIComponent component,
Object modelValue) |
public String getAsString(FacesContext context, UIComponent component, Object modelValue)
getAsString in interface Converterpublic Object getAsObject(FacesContext context, UIComponent component, String submittedValue)
getAsObject in interface Converter