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Monday, 26 November 2012

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

  ViewObject vo=am.getViewObject();

    int totalCount=vo.getRowCount();  
    vo.setRangeSize(totalCount);

   // Get All Rows 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;
    }
 

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