Adding Validation to the Criteria in ADF

Hello Guys if you want to add validation to the input text fields of the Criteria please follow the steps.

Step1: Create a view Criteria as shown below

Step2:

Drop this named criteria from data controls to a page as Query Panel

Step3:

Drop the View Object as form on the same page

Step4: add Partial Target of the form to Criteria

Step5: Select af:Query Component in Structure window and change the query listner property from Property Inspector as shown below(Default query Listner value is: #{bindings.EmployeesEOViewCriteriaQuery.processQuery} ) save this value which needs to be used in bean class

Step6:

write the following code in the bean class:

package com.test.beans;

import com.mobile.model.TestAMImpl;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;

import oracle.adf.model.BindingContext;
import oracle.adf.model.binding.DCDataControl;
import oracle.adf.model.binding.DCIteratorBinding;
import oracle.adf.view.rich.event.QueryEvent;

import oracle.binding.BindingContainer;

import oracle.jbo.ApplicationModule;
import oracle.jbo.server.ViewObjectImpl;

public class FormValidate1 {
    public FormValidate1() {
    }

    public void customQueryListner(QueryEvent queryEvent) {     // Add event code here...
       
       String fname = null;
        String lname = null;
        BindingContext ctx = BindingContext.getCurrent();
        BindingContainer cont = ctx.getCurrentBindingsEntry();
        DCIteratorBinding dci = (DCIteratorBinding) cont.get("EmployeesEOView1Iterator");
        ApplicationModule am  = dci.getDataControl().getApplicationModule();
        //ApplicationModule am  = dci.getDataControl().
//        cont.ge
       //  ApplicationModule am  = dci.geta
        DCDataControl dc = ctx.findDataControl("TestAMDataControl");
        TestAMImpl ta =(TestAMImpl) dc.getApplicationModule();
       
        ViewObjectImpl voi = (ViewObjectImpl)dci.getViewObject();
        fname = (String)voi.getNamedWhereClauseParam("bFirstName");
        lname = (String)voi.getNamedWhereClauseParam("bLastName");
        if(fname.length() >4) {
        FacesContext.getCurrentInstance().addMessage(null,new FacesMessage("Name should not be lessthan 4 charecters"));
        }
        else if(am.getTransaction().isDirty()) {
            FacesContext.getCurrentInstance().addMessage(null,new FacesMessage("Please Save the changes or Undo Them"));
        }
       
        else{
           
         String el = "#{bindings.EmployeesEOViewCriteriaQuery.processQuery}";
            invokeEL(el, new Class[]{QueryEvent.class}, new Object[]{queryEvent});
           // invokeEL(el, null,  new Object[]{queryEvent});
        }
       
       
    }
   
   
    public static Object invokeEL(String el,Class[] paramtypes, Object[] params) {
        FacesContext cont = FacesContext.getCurrentInstance();
        ELContext elcont =  cont.getELContext();
        ExpressionFactory ef = cont.getApplication().getExpressionFactory();
        MethodExpression exp = ef.createMethodExpression(elcont, el, Object.class, paramtypes);
        return exp.invoke(elcont, params);
    }
}

Step7:
Run the application and give charecters for firstname more than 4 you will get error message.