To answer your second question, the LazyCollections aren't yet public
(unless I am in some kinda coma) , they can be found in commons nightly
builds.This is OO Software Craftsmanship at its best!! The code is very
well documented and should be enough to get you going.
regards
hemant
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Wednesday, July 24, 2002 11:22 AM
Subject: Re: Wrapping Collections in LazyList to auto-populate form on
Submit
>
> Two questions:
> 1 - In our situation we will be getting a *result* object with an
> internal list from the backend that is similar to the MonkeyBean.
> I would NOT be able to change it's implementation (ie:adding
> LazyCollections) . How could I achieve the same thing? Would I need to
> create to temporary list wrappers that would be used to manually insert
> the newly created lists ?
>
> 2 - Are the LazyCollections public now. The last I heard they were
on
> there way to Commons. I have been checking Arrons site and have seen to
> mention
> of them. I also understand that some of the tutorials will be updated
with
> the lazy collections instead of putting the list in session. Is this the
> case?
>
> Thanks
>
>
>
>
> "hemant" <[EMAIL PROTECTED]> on 07/24/2002 10:02:05 AM
>
> Please respond to "Struts Users Mailing List"
> <[EMAIL PROTECTED]>
>
> To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> cc:
>
> Subject: Re: Wrapping Collections in LazyList to auto-populate form on
> Submit
>
>
> 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]>
>
>
>
>
>
>
>
>
> --
> 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]>
