finding derived classes from base class

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sakcee@gmail.com - 25 Jul 2007 06:25 GMT

I am trying to find a way to find all the derived classes , given a
parent class, off a source folder or package.
I dont want to load the classes , one way is to have one pass through
code and build a tree with object at root etc

any ideas are appreciated

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Roedy Green - 25 Jul 2007 07:06 GMT

On Tue, 24 Jul 2007 22:25:59 -0700, "sakcee@gmail.com"
<sakcee@gmail.com> wrote, quoted or indirectly quoted someone who said

>I am trying to find a way to find all the derived classes , given a
>parent class, off a source folder or package.
>I dont want to load the classes , one way is to have one pass through
>code and build a tree with object at root etc

You can read up on the class file format and load the bytes with nio
and have a look. See http://mindprod.com/jgloss/javaclassformat.html

There are also various libraries for manipulating class file byte
codes.
See http://mindprod.com/jgloss/jasm.html

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Andrew Thompson - 25 Jul 2007 07:14 GMT

>I am trying to find a way to find all the derived classes , given a
>parent class, off a source folder or package.

Why?

>I dont want to load the classes , one way is to have one pass through
>code and build a tree with object at root etc
>
>any ideas are appreciated

Ask a specific question.

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Andrew Thompson
http://www.athompson.info/andrew/

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sakcee@gmail.com - 25 Jul 2007 08:34 GMT

we have many classes that define static values, we want to load them
by class names and with hierarchies.

I am just looking for a way, any way, of finding all derived classes
given a parent

> sak...@gmail.com wrote:
> >I am trying to find a way to find all the derived classes , given a
[quoted text clipped - 13 lines]
>
> Message posted via JavaKB.comhttp://www.javakb.com/Uwe/Forums.aspx/java-general/200707/1

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voorth - 25 Jul 2007 09:01 GMT

On Jul 25, 9:34 am, "sak...@gmail.com" <sak...@gmail.com> wrote:

> we have many classes that define static values, we want to load them
> by class names and with hierarchies.
>
> I am just looking for a way, any way, of finding all derived classes
> given a parent

In the Eclipse IDE, there is a "Type Hierarchy" view. It gives you a
way to navigate the entire inheritance tree.

Henk

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Lew - 25 Jul 2007 15:16 GMT

"sakcee@gmail.com" wrote:

>> I am just looking for a way, any way, of finding all derived classes
>> given a parent

This is a stronger requirement than you first stated:

> I am trying to find a way to find all the derived classes , given a
> parent class, off a source folder or package.

There is no way in general to find /all/ derived classes - it's an unbounded
set over time. It should be possible to find all the derived classes in a
specific source folder (or other resource) at a given moment in time, though.

Eclipse (as voorth stated) and Netbeans both have code to do show class
hierarchies, and they are open source.

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Lew

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finding derived classes from base class

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