Primefaces Picklist Converter
converters, java, picklist, primefaces
Solution
For picklist use this `generic converter` :
import java.util.Map;
import java.util.Map.Entry;
import java.util.UUID;
import java.util.WeakHashMap;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
@FacesConverter(value = "entityConverter")
public class EntityConverter implements Converter {
private static Map<Object, String> entities = new WeakHashMap<Object, String>();
@Override
public String getAsString(FacesContext context, UIComponent component, Object entity) {
synchronized (entities) {
if (!entities.containsKey(entity)) {
String uuid = UUID.randomUUID().toString();
entities.put(entity, uuid);
return uuid;
} else {
return entities.get(entity);
}
}
}
@Override
public Object getAsObject(FacesContext context, UIComponent component, String uuid) {
for (Entry<Object, String> entry : entities.entrySet()) {
if (entry.getValue().equals(uuid)) {
return entry.getKey();
}
}
return null;
}
}
Problem
I am using Primefaces 4.0 and JSF 2.2. I used a picklist with a converter. The problem is that I don't get the correct `arg2` in my converter. It always says `0`. My expectation is that this is the id of the element and I could parse it out of source/target lists. Any Ideas? My `Converter` is inspired by How to write a custom converter for <p:pickList>. My Picklist declaration is as follows: ``` <p:pickList value="#{loadingPlaceGroups.pickList}" style="margin:0" var="loadingPlace" converter="primeFacesPickListConverter" itemValue="#{loadingPlace}" itemLabel="#{loadingPlace.name}#{loadingPlace.location.address.street}#{loadingPlace.location.address.houseNr}#{loadingPlace.location.address.zipCode}#{loadingPlace.location.address.city}" showSourceFilter="true" showTargetFilter="true" filterMatchMode="contains" styleClass="picklist500x350source picklist500x350target"> <f:facet name="sourceCaption">Alle Ladestellen</f:facet> <f:facet name="targetCaption">Gewählte Ladestellen</f:facet> <p:column style="border-bottom:1px solid lightgray"> <p:panelGrid> <p:row> <p:column style="padding-left:0;font-size:12pt"> <h:outputLabel value="#{loadingPlace.name}" style="font-weight:bold" /> </p:column> </p:row> <p:row> <p:column style="padding:0"> <h:outputLabel value="#{loadingPlace.location.address.street} #{loadingPlace.location.address.houseNr}" /> </p:column> </p:row> <p:row> <p:column style="padding:0"> <h:outputLabel value="#{loadingPlace.location.address.zipCode} #{loadingPlace.location.address.city}" /> </p:column> </p:row> </p:panelGrid> </p:column> </p:pickList> ```