Arron
Great answer!
Will experiment with my code based on your suggestions and let you know
Thanks for your time
Regards
hemant
----- Original Message -----
From: "Arron Bates" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Wednesday, July 24, 2002 10:46 AM
Subject: Re: Wrapping Collections in LazyList to auto-populate form on
Submit
> The seed beans would be child beans to the banana beans. You'd ask the
> monkey bean for the collection of bananas, and once you have a banana,
> you'd ask the banana for the list of it's seeds. So, the list becomes a
> member of the banana. Looking a little like this...
>
>
> public class BananaBean {
> public String getFlavour() { return flav; }
> public void setFlavour(String str) { flav = str; }
>
> public List getSeeds() { return seedList; }
>
> private List seedList = LazyCollections.lazyList(new ArrayList(),
> SeedBean.class);
> private String flav;
> }
>
>
>
> Nested beans are all about composition. Each nesting level will be
> composed of that beneath it. Monkey's don't manage seeds, they manage
> bananas. Seed management is up to the Banana. If there's another level,
> then the seed bean will take care of that. The Monkey examples of my
> site are an example of all this. What may be confusing is that they
> build objects and at times their children for sake of convenience. But
> the member collections themselves are always attached to the object
> they're concerned with.
>
> So when the request comes in, it will make the monkey object for the
> form. It'll then ask for the banana at the index. When the banana's made
> it will make the lazy wrapped list of seeds. so when an update for a
> seed comes in, then it will make the seed object for the banana.
>
> Once you have one level going, the rest are just as easy. From one to a
> hundred list levels, it's all the same. Other things come to light
> too... you don't have to always have the model start with monkey. Say
> another form which is banana specific, you can use the same banana
> object in another model, and it'll work just as well. Gotta love OOP :)
>
>
> Arron.
>
>
> On Wed, 2002-07-24 at 23:43, hemant wrote:
> > Arron,
> >
> > Thanks for responding.
> >
> > Things seem to be clearer now. I have a question to ask though.
> >
> > We all know Bananas have seeds. (So a BananaBean can have a collection
of
> > seeds.)
> >
> > Now I have a situation where I have to set the property of the seed bean
via
> > the JSP on submit.
> >
> > Lets have a seed bean
> >
> > public class SeedBean {
> > public String getColor() { return color; }
> > public void setColor(String str) { color= str; }
> > private String color;
> > }
> >
> > Now in the MonkeyBean (Which is the formbean ) can I say the following?
> >
> > public class MonkeyBean {
> > public List getBananas() { return bananas; }
> > private List bananas = LazyCollections.lazyList(new
> > ArrayList(LazyCollections.lazyList(new ArrayList(), SeedBean.class)),
> > BananaBean.class);
> > }
> >
> >
> > I tried doing the same but it didnt work :(
> >
> > Thanks for your time
> > hemant
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Arron Bates" <[EMAIL PROTECTED]>
> > To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> > Sent: Tuesday, July 23, 2002 10:19 AM
> > Subject: Re: Wrapping Collections in LazyList to auto-populate form on
> > Submit
> >
> >
> > > Hemant,
> > >
> > > Sorry about the issues you're having, but at face value it seems that
> > > you're almost trying too hard. Without seeing the rest of your code,
> > > it's hard to see what your generateWrappedCollection() method is
trying
> > > to acheive, so I'll try to answer with code...
> > >
> > >
> > > With the collection wrapping, it's a simple one liner in the bean. For
> > > example, in all my monkey examples, they all return the collection as
> > > the indexed property type (because it's a valid indexed getter and the
> > > iterate tags can use the collection to get their thing going). All you
> > > need to do is wrap that collection directly.
> > >
> > >
> > > For example, two complete beans...
> > >
> > > public class MonkeyBean {
> > > public List getBananas() { return bananas; }
> > > private List bananas = LazyCollections.lazyList(new ArrayList(),
> > > BananaBean.class);
> > > }
> > >
> > > public class BananaBean {
> > > public String getFlavour() { return flav; }
> > > public void setFlavour(String str) { flav = str; }
> > > private String flav;
> > > }
> > >
> > >
> > >
> > > The MonkeyBean is the parent class that hold the collection. It has
> > > immediately wrapped the ArrayList in the LazyCollection, and passed it
> > > the class of the BananaBean object. You may want to keep a reference
to
> > > the wrapped ArrayList, generally I don't have the need to.
> > >
> > > These classes are all but ready to rock. In the action class, query
the
> > > database or whatever and populate the MonkeyBean with the BananaBean
> > > data. Serve the result to the JSP.
> > >
> > > JSP write out a list of text boxes using iterate tags. Submit this,
and
> > > after the monkeybean is built, the lazy collection will grow the
banana
> > > list with banana beans as the indexed requests come in.
> > >
> > > When it gets back to your action class, you'll have your collection of
> > > banana beans.
> > >
> > > Hope this helps, you know where we are if it doesn't.
> > >
> > >
> > > Arron.
> > >
> > >
> > >
> > > On Mon, 2002-07-22 at 22:59, hemant wrote:
> > > > Comrades,
> > > >
> > > >
> > > > Objective: To autopopulate forms on submit. The formbean "has a"
> > collection of collections of ValueObjects. Each valueObject contains a
pair
> > of other Value Objects.
> > > >
> > > > Before people beat me up, The following possibilities have been
dealt
> > with:
> > > >
> > > > 1>> No, this is not a case of reset() I have the collections
initialized
> > and things are fine.
> > > >
> > > > 2>> It is not a case of bean being in request scope. By default the
bean
> > is in session scope (Unless we explicitly mention the action attribute
that
> > it is request scope.)
> > >
> > > [ ...cut...]
> > >
> > > >
> > > > I am about to give up on form auto populate as I am out of time. I
will
> > be populating them by hand but anyway... one last attempt. We dont like
to
> > lose... do we?
> > > >
> > > >
> > > >
> > > > Thanks In Advance
> > > >
> > > > hemant
> > >
> > >
> > > --
> > > To unsubscribe, e-mail:
> > <mailto:[EMAIL PROTECTED]>
> > > For additional commands, e-mail:
> > <mailto:[EMAIL PROTECTED]>
> > >
> >
> >
> > --
> > To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
> > For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>
>
>
>
> --
> To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
> For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>
>
--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
