Here's an example for a custom workflow action which is complied when the current user is the creator of the document:
public class CreatorCondition extends AbstractCondition {
public boolean isComplied(situation, instance) {
WorkflowDocument wfDoc = (WorkflowDocument) instance;
Document doc = wfDoc.getDocument();
String creator = doc.getDublinCore()
.getFirstValue(DublinCore.ELEMENT_CREATOR);
CMSSituation situationImpl = (CMSSituation) situation;
String currentUser = situationImpl.getUserId();
return creator != null && creator.equals(currentUser);
}
}