Type Checking in Expression Language
I have to handle a list with students who are either inscribben or matriculated. To model this I used @Inheritance. Now I want to show all of them in a Table, but with different attributes - depending on the subclass. My idea was mask the attributes with the rendered attribute in the JSF. Unfortunately I don't know how to do this. I already searched the internet, but I found now solution. Can somebody here help me?
The JSF:
<h:dataTable value="#{studentList}" var="stud" rendered="#{studentList.rowCount>0}" border="1">
<h:column>
<f:facet name="header">Name</f:facet>
<s:link action="#{inscription.startEdit}" value="#{stud.givenName} #{stud.familyName}" />
</h:column>
<h:column>
<f:facet name="header">Loeschen</f:facet>
<s:link action="#{inscription.delete}" value="loeschen" />
</h:column>
<h:column>
<f:facet name="header">Prozent</f:facet>
<h:outputText value="#{stud.percentage}" />
</h:column>
<h:column>
<f:facet name="header">Perzentil</f:facet>
<h:outputText value="#{stud.percentil}" />
</h:column>
<h:column>
<f:facet name="header">Rang</f:facet>
<h:outputText value="#{stud.rank}" />
</h:column>
<h:column>
<f:facet name="header">Durchschnitt</f:facet>
<h:outputText value="#{stud.mean}" />
</h:column>
<h:column>
<f:facet name="header">Aequivalenz</f:facet>
<h:outputText value="#{stud.equivalence}" />
</h:column>
</h:dataTable>
The accessed attributes (e.g. stud.mean) are from "inscribben" (that was the class I started with) ---^
The Session-Bean:
@Stateless
@Name("inscription")
public class InscriptionAction implements InscriptionFacade {
@Logger private Log log;
@PersistenceContext EntityManager em;
@DataModel private List<Student> studentList;;
@In(required=false)
@Out(required=false)
@DataModelSelection
private StudentInsc inscribben;
@In(required=false)
@Out(required=false)
private Representative representative;
@Factory("studentList")
public List<Student> getStudentList() {
studentList = (List<Student>) em.createQuery("from Student").getResultList();
return studentList;
}
public void setStudentList(List<Student> studentList) {
this.studentList = studentList;
}
....
And the Entity Beans:
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Student implements Serializable {
@Id @GeneratedValue
protected long id;
.....
@Entity
@Name("inscribben")
public class StudentInsc extends Student {
@Length(max=30) private String kindergarten;
@NotNull private boolean behavior;
@NotNull private boolean utilization;
@NotNull private boolean language;
@NotNull private boolean materials;
@Range(min=0, max=50) private int percentage;
@Range(min=0, max=100) private int percentil;
@Range(min=0, max=6) private int rank;
@Range(min=0, max=20) private int mean;
@Length(max=15) private String equivalence;
....
@Entity
@Name("matriculated")
public class StudentMat extends Student {
....
Thanks
