Re: Implementing an ordered tree
Re: Implementing an ordered tree
- Subject: Re: Implementing an ordered tree
- From: "YL" <email@hidden>
- Date: Tue, 24 Jan 2006 12:17:27 -0700
|
Although I don't have bad experiences about validateForSave even done some set..methods in
it, I'm thinking of moving thing out there:-)
I've things similar to ordered tree and I'm caching tree path in nodes
for searching convenience.
I also have a hyper relationship eo<<-->ownerEO
specified by two keys: (oidOwner, ownerClassName). when I say
anEO.addOwner(ownerEO), I need some general approach of key assigning.
since one or both anEO and ownerEO may be newly created (with temp globalID).
all these sync problems are better treated right before saveChanges().
Thanks
----- Original Message -----
Sent: Tuesday, January 24, 2006 1:07
AM
Subject: Re: Implementing an ordered
tree
Except you
can't call any set... methods in validateForSave without incurring the wrath
of the gods. (Please don't call set methods in validation code. . . I can't
believe I got to say this before Chuck Hill responded.)
Wrapper
methods that perform the behavior you want are what you're after here, I
think. Skiena's Algorithm Design Handbook may cover this.
On Jan 23, 2006, at 9:18, YL wrote:
validateForSave() is where i would put the logic for
re-ordering.
the idea:
implement methods
(1)
checkChildrenOrder() that returns false if children array has
order
problem
(2) resetChildrenOrder() that loop over its children
array and set each
one's order attribute to its index in the
array.
in validateForSave(), you say
validateForSave()
{
super().validateForSave();
if(!checkChildrenOrder())
{
resetChildrenOrder();
}
}
----- Original
Message -----
From: "Karoly Szantai" <email@hidden>
To: <email@hidden>;
<email@hidden>
Sent:
Monday, January 23, 2006 4:32 AM
Subject: Implementing an ordered
tree
> Hello,
>
> I have a Category entity. Each
Category has zero or more subcategories,
> which are ordered. There is
a root Category (called main category)
> which has no parent.
>
I have created this EO model:
>
> oid
>
oidParentCategory
> name
> ordinalNumber
>
>
parentCategory (oidParentCategory --> oid)
> subcategories (oid
-->> oidParentCategory)
>
>
> I need some hints on
how to implement the following operations
> (methods) with "ordered
way":
>
> -add a category
> -delete a category
>
-cut & paste a category (and its subcategories) from one level
to
> another level
> -reorder categories (move a category in its
level)
> etc.
>
> My big headache is manipulating the
ordinalNumber attribute in "EO way".
>
>
>
Regards,
>
Karoly
>
>
>
>
>
>
>
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