ADF Basics: Set multiple LOV's on attribute and conditionally switch using LOV Switcher

This post is about a very basic and common use case
Suppose we have to show different values in our List depending on some condition but all values must be stored in same attribute so for this type of requirement ADF BC framework provides concept of LOV Switcher
Framework allows us to define multiple LOV on same attribute, I hope you all know about defining LOV(List of Values) so move ahead and see how to use lov switcher

 See the implementation part-

• Created a Fusion Web Application and a viewObject to show LOV on viewport (Used dual to create view object for this example , you can use use your own)








• Created 2 more viewObject to apply LOV on first viewObject's attribute, One ViewObject is for Departments and other one is for Employees






• Open dual viewObject select LovAppl attribute and goto ListOfValues tab and add both LOV
  For Department - DepartmentId is List Attribute and DepartmentName will be shown on UI




For Employees- EmployeeId is List Attribute and FirstName,LastName will be shown on UI






• Now click on green plus icon of List Of Values Switcher and add a transient attribute , this will be further used to switch lov on base of some condition





• So created LovSwitcher attribute , and remember this switcher attribute value should be one of the LOV Name that are applied on attribute.
  Here i am using a condition - if LovType attribute of Dual viewObject is 'D' the LovAppl should show Departments Lov and if it is 'E' then LovAppl should show Employees Lov
  For this i have written expression for lov switcher attribute
  LovType=='D' ? 'LOV_LovAppl' : LovType=='E' ? 'LOV_LovAppl1' : null





• Now run Application Module and check it

Thanks , Happy Learning :)

Use View Link Accessor to call aggregate functions, set attribute value , set bind variables value (Oracle ADF)

Hello All

This post is about various usage of view link accessor  , when we create viewLink between two viewObjects , destination accessor is created by default in master viewObject, there is check box to create source accessor also at same time

We can use this view link accessor for calculating attribute's sum, setting value of attributes etc

here Departments is master viewObject and Employees is it's detail, after creating viewLink you can see in viewObject xml source there accessor is present

In Departments ViewObject- 

<ViewLinkAccessor
    Name="Employees"
    ViewLink="sample.model.view.link.DeptTOEmpVL"
    Type="oracle.jbo.RowIterator"
    IsUpdateable="false"/>

In EmployeesViewObject- 
 

<ViewLinkAccessor
    Name="Departments"
    ViewLink="sample.model.view.link.DeptTOEmpVL"
    Type="oracle.jbo.Row"
    Reversed="true"
    IsUpdateable="false"/>

So what is the use of these view link accessors ?
Master accessor in detail viewObject returns current Row of master viewObject, when you generate RowImpl class for detail viewObject , it also has a method for this accessor

    /**
     * Gets the associated <code>Row</code> using master-detail link Departments.
     */
    public Row getDepartments() {
        return (Row) getAttributeInternal(DEPARTMENTS);
    }

    /**
     * Sets the master-detail link Departments between this object and <code>value</code>.
     */
    public void setDepartments(Row value) {
        setAttributeInternal(DEPARTMENTS, value);
    }

Detail accessor in master viewObject returns a row set of all row of details viewObject that are currently referenced by master record

    /**
     * Gets the associated <code>RowIterator</code> using master-detail link Employees.
     */
    public RowIterator getEmployees() {
        return (RowIterator) getAttributeInternal(EMPLOYEES);
    }

Now see what we can do with viewLink Accessor

1. Get master attribute value in detail viewObject

suppose i have to get a attribute's value from Master viewObject (Departments) in a attribute of detail viewObject (Employee)

in this example i am getting managerId from Departments ViewObject so for this just write in expression of Employee's ManagerId field

viewLinkAccesorName.AttributeName

now run BC4J tester and check - create new record in Employee and see managerId from Departments is auto populated

 on creating new record-

2. Call aggregate function to calculate sum of an attribute of detail viewObject

suppose now i have to calculate total salary of a Department (sum of Employees salary of that department)

for this purpose just call sum function to calculate sum of all rows of detail RowSet 

take a transient attribute in Departments ViewObject and write in it's expression

viewLinkAccesorName.sum("AttributeName")

 Run ApplicationModule and see-

3. Set bind variable value as per master viewObject's attribute (pass value from master viewObject)

This  is tricky part as we can not set bind variable value through expression as it doesn't recognize view link accessor name.

created a viewCriteria and bind variable for managerId in Employee viewObject

applied this criteria to Employees viewObject instance in Application Module (Just Shuttle criteria to selected side)

now to set bind variable's value we have to override prepareRowSetForQuery method in Employees VOImpl class

this method gets the value of managerId from currentRow of master ViewObject (Departments)and sets in bind variable of Employees viewObject

    @Override
    public void prepareRowSetForQuery(ViewRowSetImpl viewRowSetImpl) {
        RowSetIterator[] masterRows = viewRowSetImpl.getMasterRowSetIterators();
        if (masterRows != null && masterRows.length > 0 && masterRows[0].getCurrentRow() != null &&
            masterRows[0].getCurrentRow().getAttribute("ManagerId") != null) {
            Integer managerId = (Integer) masterRows[0].getCurrentRow().getAttribute("ManagerId");
            viewRowSetImpl.ensureVariableManager().setVariableValue("BindManagerId", managerId);
            System.out.println("ManagerID in bind Var-" + managerId);

        }
        super.prepareRowSetForQuery(viewRowSetImpl);
    }

now run AM and check it-

Happy Learning :)

Getting selected value (not index) & display value of select one choice programmatically in ADF

Hello All,
This post is about a common requirement of getting selected value & display value of af:selectOneChoice in managed bean
normally when we try to get selected value of  selectOneChoice in managed bean (in ValueChange/ Validator or using binding) it returns index of that row
so there is a little piece of code using that we can get selected value of choice component

• I have used Departments table of HR Schema in sample and created a lov on a transient field





• Now dropped that ViewObject on page as a table 





• Created a value change listener in managed bean fro DeptIdTrans but it return index of selected value










• Then i googled about it and used this method to solve my headache, try to get attributeValue instead of inputValue, see the code written in valueChaneListener in managed bean



    /**Value Change Listener of DeptIdTrans (to get selected and display value)
     * @param vce
     */
    public void deptIdVCE(ValueChangeEvent vce) {
        System.out.println("New Value is-" + vce.getNewValue());
        if (vce.getNewValue() != null) {
            this.setvalueToExpression("#{row.bindings.DeptIdTrans.inputValue}",
                                      vce.getNewValue()); //Updating Model Values
            Integer selectedCode =
                Integer.parseInt(this.getValueFrmExpression("#{row.bindings.DeptIdTrans.attributeValue}").toString());

            System.out.println("******** Selected Value in List***** " + selectedCode);
            System.out.println("*******Display Value in List ****" +
                               getValueFrmExpression("#{row.bindings.DeptIdTrans.selectedValue.attributeValues[1]}"));

        }
    }



• There is two methods to set and get value in expression (EL)



    /**Method to set value in Expression (EL)
     * @param el
     * @param val
     */
    public void setvalueToExpression(String el, Object val) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
        ValueExpression exp = expressionFactory.createValueExpression(elContext, el, Object.class);
        exp.setValue(elContext, val);
    }

    /**Method to get value from Expression (EL)
     * @param data
     * @return
     */
    public String getValueFrmExpression(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 = null;
        Object obj = valueExp.getValue(elContext);
        if (obj != null) {
            Message = obj.toString();
        }
        return Message;
    }



• Again run page and select any value in selectOneChoice (lov) and see the result

Cheers :-) Happy Learning

Reference-https://blogs.oracle.com/shay/entry/getting_the_value_from_a_selec

ViewObject Validation rules for transient attributes (Model level validation in ADF)

Hello All,
this post is about model level validation for transient attributes, often we need to apply some common types of validation on transient attributes (as for negative value, for email, for phone number)
in ADF ViewObject there is a editor for validation rules for transient attributes, so now see how to use that editor and rules

• Create a fusion web application and prepare model layer using Departments table of HR schema





• Then create a transient attribute in viewObject and you can see that Validation Rules tab appears only in case of transient attribute








• Now click on add icon to add new validation rule for attribute, you can see there are multiple types for that validation rule 








• In this post i have used Compare and Regular Expression rules, suppose i have to check that value of transient attribute must not be 100 , so for that rule will be like this, and write a proper message for failure handling 








• Now run your BC4J tester and check , a window with error message appears there in case of failure





• You can also check this validation on your page, some more- i have added one more transient field for Email Address and applied a regular expression to validate this field (ADF by default provides regular expression for Email and Phone Number pattern for others you can use your own pattern)





• After model level configurations , i have dropped Departments ViewObject on page as ADF form, here you can see both validation are working 

Cheers :-) Happy Learning

Iterating ViewObject vertically (get all attributes of ViewObject) programmatically

Hello All,
This post talks about a requirement of getting all attributes (column names) of a viewObject programmatically

• Create a fusion web application and business component using department table

• you can see all attributes in  Departments entity object

• Now to get ViewObject's attributes name , there is a method written in AMImpl class , see it, i have added a facesMessage to show all names on a Message Board





    /**Method to get all attributes of a viewObject
     * */
    public void iterateVoVertically() {
        ViewObjectImpl vo = this.getDepartments1();
        ViewAttributeDefImpl[] attrDefs = vo.getViewAttributeDefImpls();
        int count = 0;
        StringBuilder infoMsg =
            new StringBuilder("<html><body><b><p style='color:red'> Attribute of Department ViewObject are-</p></b>");
        infoMsg.append("<ul>");


        for (ViewAttributeDefImpl attrDef : attrDefs) {
            byte attrKind =
                attrDefs[count].getAttributeKind(); //checks attribute kind for each element in an array of AttributeDefs
            if (attrKind != AttributeDef.ATTR_ASSOCIATED_ROW && attrKind != AttributeDef.ATTR_ASSOCIATED_ROWITERATOR) {
                String columnName = attrDef.getName();
                infoMsg.append("<li> <b>" + attrDef.getName() + "</b></li>");
                System.out.println("Column Name-" + columnName);
            }
        }
        infoMsg.append("</ul><br>");
        infoMsg.append("</body></html>");
        FacesMessage msg = new FacesMessage(infoMsg.toString());
        msg.setSeverity(FacesMessage.SEVERITY_INFO);
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }



• I have called this method through page binding and AM Client on a button of page

• now on click of button all attributes of Departments ViewObject are shown in FacesMessage, you can use it in your code

 Cheers :-)