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Implementing an ordered tree

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Implementing an ordered tree

Subject: Implementing an ordered tree
From: Karoly Szantai <email@hidden>
Date: Mon, 23 Jan 2006 12:32:45 +0100

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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