[jboss-user] [JBoss Seam] - 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
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