public class GenericEnumConverter
extends java.lang.Object
implements javax.faces.convert.Converter
UISelectMany
components whose value is been bound to a
List<T>
property. Even though JSF has already a built-in EnumConverter
, this doesn't work
for a List<T>
property as the generic type information 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("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 intended to remove the need
to create a new enum converter every time.
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 |
---|---|
java.lang.Object |
getAsObject(javax.faces.context.FacesContext context,
javax.faces.component.UIComponent component,
java.lang.String submittedValue) |
java.lang.String |
getAsString(javax.faces.context.FacesContext context,
javax.faces.component.UIComponent component,
java.lang.Object modelValue) |
public java.lang.String getAsString(javax.faces.context.FacesContext context, javax.faces.component.UIComponent component, java.lang.Object modelValue)
getAsString
in interface javax.faces.convert.Converter
public java.lang.Object getAsObject(javax.faces.context.FacesContext context, javax.faces.component.UIComponent component, java.lang.String submittedValue)
getAsObject
in interface javax.faces.convert.Converter