[jboss-user] [JBoss Seam] - EnumConverter for multi-select lists
Hi everyone. I'd like to contribute the following converter. It allows you to use
a multi-select list with enum values. I just took the existing EnumConverter and added
come code to look for the s:selectItems control that has a value which is a list or array
of enums.
I put something up on my own wiki about it here:
http://shrubbery.mynetgear.net/wiki/Select_lists_with_Seam#Multi-select_f...
And here's the code:
| package eg;
|
| import javax.faces.component.*;
| import javax.faces.context.*;
| import javax.faces.convert.*;
| import javax.faces.el.ValueBinding;
| import java.util.List;
| import java.util.Collection;
|
| /**
| * Converter for enum multi-selects.
| * <br>User: Joshua Davis
| * Date: May 16, 2007
| * Time: 7:25:58 AM
| */
| public class EnumListConverter implements Converter
| {
| @SuppressWarnings({"unchecked"})
| public Object getAsObject(FacesContext context,
| UIComponent comp,
| String value)
| throws ConverterException
| {
| ValueBinding binding = comp.getValueBinding("value");
| Class enumType = binding.getType(context);
| if (enumType.isEnum()) // Single enum?
| return Enum.valueOf(enumType, value);
| else // List of enums.
| {
| // Find the s:selectItems so we can get the enum.
| List children = comp.getChildren();
| for (Object child : children)
| {
| if (child instanceof UIComponent)
| {
| UIComponent c = (UIComponent) child;
| ValueBinding b = c.getValueBinding("value");
| Class t = b.getType(context);
| // Array of enums: use the component type.
| if (t.isArray() && t.getComponentType().isEnum())
| {
| t = t.getComponentType();
| return Enum.valueOf(t,value);
| }
| else
| {
| Object v = b.getValue(context);
| // Collection of enum values, get the type of the first
element.
| if (v instanceof Collection)
| {
| t = ((Collection) v).iterator().next().getClass();
| return Enum.valueOf(t,value);
| }
| }
| }
| }
| throw new ConverterException("Unable to find selectItems with enum
values!");
| }
| }
|
| public String getAsString(FacesContext context,
| UIComponent component,
| Object object)
| throws ConverterException
| {
| if (object == null) {
| return null;
| }
|
| return ((Enum) object).name();
| }
|
| }
|
After registering it with facelets, it can be used like this:
| <h:selectManyCheckbox id="roles"
| layout="pageDirection"
value="#{person.roles}"
| required="true">
| <s:selectItems value="#{enumLists.roleArray}" var="role"
| label="#{role}"/>
| <s:convertEnum/>
| </h:selectManyCheckbox>
|
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