I would use a UserCredentials interface that gets passed down to the DAO. My
action would be more like:
public void execute(...) {
// marshall the input
UserCredentials userCredentials = new
PresentationLayerUserCredentials(request);
// invoke the business layer
PapersList list = PapersList.find(userCredentials);
// save the results
request.setAttribute("PapersList", list);
// redirect
return mapping.findForward("success");
}
Note that
1. The PresentationLayerUserCredentials knows how to extract the proper
information from the request, encapsulating that knowledge.
2. The business layer just uses the generic UserCredentials interface.
3. The list to be displayed is encapsulated in an object, not a naked
collection.
4. The action doesn't call directly to the DAO.
5. The UserCredentials interface has a method that returns a value useful for
the DAO to use in a SQL WHERE clause.
The business layer class might PapersList include something like:
static PapersList find(UserCredentials userCredentials) {
PapersList results = new PapersList(); // create an empty list
dao.find(results, userCredentials); // fill the list from
the dao
return results;
}
> -----Original Message-----
> From: Joel Alejandro Espinosa Carra
> [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, February 07, 2006 5:22 PM
> To: user@struts.apache.org
> Subject: Populate action
>
>
> Hi all,
>
> I think this is more a design question than a struts question, but I
> want to know who is the struts-way to do this.
> I have a requeriment of listing some items (in my case, scientific
> papers) in a html table view.
> Another requirement is that users can see diferent listing of data
> depending of theirs permissions, and the administrator can see
> everything (like always)
> I want to know how much code I'm able to save if I design ONLY ONE
> action for hadle the prepopulation of the items list that will be
> displayed latter in a jsp page, or if its better to do more than one
> single action for the prepopulation of data.
>
> My action would be like this:
>
> public void execute(...) {
> List list = new LinkedList();
>
> if("admin".equals(request.getUserRole().toString())) {
> //go to the DAO Layer and get the list of beans for
> the admin role
> list = dao.getPapersForAdmin();
> }
> //and so on for the others roles
> .
> .
> .
>
> } //note that I wrote this little code in my email client not
> in my IDE
>
> But what can I do in the case of one user could have more than one
> option for display items, like the administrator are be able
> to see only
> the rejected papers but also can see all the papers.
>
> Any ideas?
>
> Best regards.
>
> --
> Ing. Joel Alejandro Espinosa Carra
> CINVESTAV CTS - Centro de Tecnología de Semiconductores
> Tel. +52 (33) 3770-3700 ext. 1049
> http://www.cts-design.com
>
>
> --
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>
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