19 Jun 2011

Using UI Categories with Dynamic form

JDev 11g R2 has new interesting feature "UI Categories". It allows us to group VO's attributes declaratively at the view object definition level. For example, "UI Categories" tab for my  VEmployees view object looks like this:

By default every view object has one predefined category "Default". I created three new categories "Name", Contact, Other and assigned attributes to them. At this tab we can also define Label and Tooltip for our categories. In the Application Module Tester window it looks like this:

According to the documentation UI Categories should be utilized by Dynamic forms and Search forms. ADF Faces Dynamic Form component really has new attribute Category. The form filters VO's attributes and shows only attributes of the specified category. For example, if I wanted to show attributes of the Name category, I would use the following construction:

          <dynamic:form value="#{bindings.VEmployeesIterator}" id="f3" 
So, if we want to show different categories separately, we have to use <dynamic:form tag for each category. But the documentation provide very interesting sentence "In the case of dynamic forms, the attributes from each category will appear in a separate tab". I guess that we are expected to implement this feature by ourselves :). In this post I'm going to show how we can do it.

In the implementation class of my view object I defined some API method to get all UI Categoties of the view object except default one:

    public List<Category> getAttrCategries() {
        return getOrderedCategories(false, //except Default
                                    CategoryType.ATTRIBUTE, null); 

In order to draw tabs on the page for each UI Categogry I used the following jspx code:


So, in this simple construction I use forEach tag within navgationPane to draw commandNavigationItem for each category. The Java code of the MainDynamicBean managed bean looks like this:

    //Currently selected tab
    private String selectedItem;

    //Getting categories list
    public List<Category> getCategoryList() {
        return (List<Category>) resolveExpression("#{bindings.VEmployeesIterator.viewObject.attrCategries}");
    //Just a setter
    public void setSelectedItem(String selectedItem) {
        this.selectedItem = selectedItem;

    //Getting selected item
    public String getSelectedItem() {
        //If nothing is selected, then select the first one
        if (selectedItem == null) {
            List<Category> l = getCategoryList();
            if (l.size()>0) selectedItem =  l.get(0).getName();                
        return selectedItem;

    //Resolving EL expressions
    public static Object resolveExpression(String expression) {
           FacesContext facesContext =  FacesContext.getCurrentInstance();
           Application app = facesContext.getApplication();
           ExpressionFactory elFactory = app.getExpressionFactory();
           ELContext elContext = facesContext.getELContext();
           ValueExpression valueExp = 
               elFactory.createValueExpression(elContext, expression, 
           return valueExp.getValue(elContext);

And finally, I use the following construction to draw Dynamic form with attributes of the selected category:
   <dynamic:form value="#{bindings.VEmployeesIterator}" id="f2"

And appropriate piece of Java code:
    private DynamicForm dynform;
    public void setDynform(DynamicForm dynform) {
        this.dynform = dynform;

    public DynamicForm getDynform() {
        return dynform;
    public Boolean getNeedRefresh() {
        //If selected category is not equal to dynform's category
        //then set needed category and refresh the dynamic form
        if (dynform.getCategory()!=getSelectedItem()) {
           return true;
        else return false;              

As the result of our work we get the following screens:

That's all!
You can download sample application for this post. 

3 Jun 2011

Using Pipelined functions in View Objects

In this post I'm going to show how we can use Oracle pipelined functions feature to retrieve data from database in the model layer of our ADF application.
Let's assume I have the following function in database:

create or replace function getEmployees
(aDepartmentID Number)
return empTable
  for rec in (select Employee_ID, First_Name, Last_name
              from employees
              where Department_ID = aDepartmentID) loop
    pipe row(new empRow(rec.Employee_ID, rec.First_Name, rec.Last_name));
  end loop;

The function returns a collection of employees for some department. The return type empTable is declared as table of some object type empRow:

create or replace type empTable as table of empRow;

create or replace type empRow as object (
 Employee_ID Number,
 First_Name Varchar2(20),
 Last_name Varchar2(25)

In the Model project of the application I created VO wtith the following definintion:

The VO's query casts the result of getEmployees to table and it has a required parameter deptid - the department's id. JDeveloper works with such structures correctly and the following VO's attributes have been added automatically:

In the Data Controls palette my VO Vpipelined has operation ExecuteWithParams:

I dropped this operation on the jspx page as ADF Parameter Form and got an inputText for department id value and a button:

After that I dropped Vpipelined as a table to the jspx page and set the table as a partial target for the ExecuteWithParams button. Finally I got the following working page: