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From Ken.H...@ubsw.com
Subject RE: Displaying recursively defined bean...
Date Tue, 19 Feb 2002 20:22:18 GMT
I've done this recently for a calculation tree. I just defined a method 
in the jsp, passing in the Message (in your example) and the JSPWriter. 
This method then recursively calls itself while outputting nested html 
tables (ie each call draws a table, with the child call filling a cell 
of it).

-----Original Message-----
From: alex.paransky 
Sent: 19 February 2002 20:12
To: struts-user
Cc: alex.paransky
Subject: Displaying recursively defined bean...


I need to display a recursively defined data structure bean.

I have a bean which looks like this:

public class Message implements java.io.Serializable {
  private String header, body, from;
  private Collection replies;

  public Collection getReplies() {return collection;}
  public String getHeader() {return header;}
  ...
}

As you have guessed, the replies is a collection containing a Message 
type
again.

So, what I want to do is start at the top message (root), and navigate 
down
through the replies.  For each reply, I need to "recurse" into that 
reply
and do the same thing.  How can this be done with JSP, or Struts?  I was
thinking of using the "nested" extension, but that does not work with a
dynamic <jsp:include which is what required in this case.

The other option is to use the pageContext as a stack for the current 
item,
and pass the new Message root in a request, something like this:

showTree.jsp:
1. Read the root Message
2. Place root message into Request with name of "message"
3. <jsp:include page="display.jsp"

display.jsp:
1. Assume there exists an object in request called "message" of type 
Message
2. Display the details of the message
3. Iterate over message.getReplies()
4. For each object in the iteration
   a. Put the object into request with the name of "message"
   b. <jsp:include page="display.jsp"

Has any one done recursive displays using JSP?

Thanks.
-AP_


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