Struts compare value between entitty class and action form

Question

I've a website which build using struts framework.

I want to keep track if there any changes made to value that previously save in database. So I want to compare value between actionForm and entities class.

The idea is something like this,

public class CompareValue extends org.apache.struts.action.Action {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        MyActionForm actionFrom = (MyActionForm) form;//form/view which contains new value that are going to be save to the database

        EntitiesJpaController entitesController = new EntitiesJpaController();
        EntitiesClass entities = entitesController.findEntitiesById(actionFrom.getId());//get data previously save to database

        if(entities!=null){
            if(!entities.getName().equals(actionForm.getName())){
                System.out.println("Update applicant name");
            }

            if(!entities.getAddress().equals(actionForm.getAddress()){
                System.out.println("Update applicant address");
            }

            if(!entities.getNrIcNo().equals(actionForm.getNrIcNo()){
                System.out.println("Update applicant social security no");
            }

            /*log the changes somewhere*/

            EntitiesClass entitiesWithNewValue = new EntitiesClass();
            BeanUtil utilBean = new BeanUtil();
            utilBean.copyProperties(entitiesWithNewValue, actionForm);//copy new value from actionForm to entitiesClasee
            entitesController.edit(entitiesWithNewValue);//save new value to database

        }

        return mapping.findForward(SUCCESS);
    }
}

but if my entities class only contains 3 fields then is not a problem to me. So I want solution where I can iterate to every fields in entities class and compare the value with new value from actionform.

IF the fieldnames are completely the same on both classes, you could use java reflection to iterate over the methods, and copy the get and set values. — Robin Jonsson, Jan 26 '14 at 13:29
@RobinJonsson reflection does not maintain order of method from Main class so it shall cause problem even when both class have same method — java seeker, Jan 26 '14 at 13:50
the entities are simple pojos, why not the entities to implement comparable. — Roman C, Jan 26 '14 at 14:57
@RomanC can you provide more clear example, is it something like this retrieved previous data Entities oldEntities = entitiesJpaController.findEntityById(id);, Entities newentities = new Entities();, copy new value from actionForm to newentities then compare oldEntities with newentities? — Zahary, Jan 27 '14 at 03:45

Struts compare value between entitty class and action form

0 Answers0