Tree Table Component in Oracle ADF(Hierarchical Representation)

Hello All

This post is about ADF Faces Tree Table component (about designing component and get selected value from tree table)

We have a simple sample application that shows how can we use tree table component in Oracle ADF.
Tree Table component represents  Hierarchical view of Master Deatil form of data
Here we take example from HR schema using Employees and Department table
Follow these steps -

• Create EOs,VOs of Employees and Department table in HR Schema and create association and viewlink between Department To Employees considering Department Id
• Now go to data control and select Department table and drop it on page as Tree table 

•  Now we have to edit its bindings, it means you have to select attributes that you want to display in page, and below Department table you should add Employees table using "add" button on top, and select appropriate Iterator in EL picker

• Now go to page and select treetable in Structure window of Jdeveloper and Go to its selection listener and copy default value

• And change selection listener set it to bean, click on edit and create new selection listener in Bean

•  Now go to Selection Listener and Use this code to get Value of selected node in treetable, if you will get value of node you can perform any operation on Tree Table

    public void treeTableSelectionListener(SelectionEvent selectionEvent) {
        String adfSelectionListener = "#{bindings.Department1.treeModel.makeCurrent}";

        FacesContext fctx = FacesContext.getCurrentInstance();
        Application application = fctx.getApplication();
        ELContext elCtx = fctx.getELContext();
        ExpressionFactory exprFactory = application.getExpressionFactory();
        MethodExpression me = null;
        me =
 exprFactory.createMethodExpression(elCtx, adfSelectionListener, Object.class, new Class[] { SelectionEvent.class });
        me.invoke(elCtx, new Object[] { selectionEvent });
       
        RichTreeTable tree = (RichTreeTable)selectionEvent.getSource();
        TreeModel model = (TreeModel)tree.getValue();
        //get selected nodes
        RowKeySet rowKeySet = selectionEvent.getAddedSet();
        Iterator rksIterator = rowKeySet.iterator();
        while (rksIterator.hasNext()) {
            List key = (List)rksIterator.next();
            JUCtrlHierBinding treeBinding = null;
            treeBinding = (JUCtrlHierBinding)((CollectionModel)tree.getValue()).getWrappedData();
            JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);
            Row rw = nodeBinding.getRow();
            System.out.println("row: " + rw.getAttribute(0)); // You can get any attribute
            System.out.println("View Object name---->" + nodeBinding.getViewObject().getName());

        }
    }

•  Now run your page and when you will click on any node you will find its value on Console---Cheers Happy Coding!

Sample ADF Application 

Most Used Codes in ADF (Iterate over ViewObject, get Value from pageFlow Scope variable)

Iterate Over View Object-

Some times we need to iterate in table to check for some validation as we have  to check for duplicate record, we want to delete all data of table with one click.

then we have to get all rows of table- this is a very common use case in ADF, so you can use following snippet of code to do this

1. Using AllRowInRange method to get rows available in range

  ViewObject vo=am.getViewObject();


   // Get All Rows in range of ViewObject in an Array
    Row[] rArray=vo.getAllRowsInRange();
    
    //Loop over array of Rows
    for(Row r:rArray){

       /*your operation code*/

       }

2. Using RowSetIterator-

  ViewObject vo = this.getViewObject();
       
       //Create RowSetIterator
        RowSetIterator rsi = vo.createRowSetIterator(null);
       //Iterate Over this to get all rows
        while (rsi.hasNext()) {
            Row nextRow = rsi.next();
            
        }
        rsi.closeRowSetIterator();

Get Value from taskFlow parameter(Using pageFlow Scope)-

we can get value from TaskFlow parameter using pageflow scope and can use it in Our Bean.

Suppose we have defined a parameter in page to pass Session_Id.

We can get it using pageflow scope

Integer sessionId = Integer.parseInt(resolvEl("#{pageFlowScope.Session_Id}"));

 Code For resolvEl-

    public String resolvEl(String data) {
        FacesContext fc = FacesContext.getCurrentInstance();
        Application app = fc.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = fc.getELContext();
        ValueExpression valueExp = elFactory.createValueExpression(elContext, data, Object.class);
        String Message = valueExp.getValue(elContext).toString();
        return Message;
    }

 

ADF Basics: Set Default Values in Entity Object for every CreateInsert

Sometimes we have to set some same(default) values for each new row for this we use literal value option in EntityObject XML file or we can set that value in EO(EntityObject) Impl class.
EOImpl Class has a method named

 protected void create(AttributeList attributeList) {

        super.create(attributeList);

}

You can set default values there
For this we have to create Entity Impl class of EntityObject , Open EntityObject and select Java tab and click on edit icon

Check Accessors and Create Method checkbox

Now set values using accessors like this -

    /**
     * Add attribute defaulting logic in this method.
     * @param attributeList list of attribute names/values to initialize the row
     */
    protected void create(AttributeList attributeList) {
        //Setting default values
        setEmail("example@gmail.com");
        setPhoneNumber("99999999");
        super.create(attributeList);
    }

or can set in Literal Value of EO xml file

This is how you can set default values in Entity Object