How to Write A Custom Path / Fileset

[Graham Lea <gr...@alumni.uts.edu.au>]

I want to write a custom Fileset type that reads input from a file.
I don't want to support any nested elements, I just want to be able to 
do something like this:

    <libraryset id="myLibraries" file="libraries.txt"/>

and have a custom class create a fileset based on the content of 
libraries.txt.

So, I have two questions:

1. Is it possible for me to do this (i.e. define a new DataType and use 
it in a build file)?
[Or do I have to write a custom Task that creates the fileset?]

2. If the answer to 1. is 'Yes', where/what should I be extending?
[Or, if the answer is 'No', what sort of FileSet should my task be 
creating?]
        org.apache.tools.ant.ProjectComponent?
        org.apache.tools.ant.types.DataType?
        org.apache.tools.ant.types.AbstractFileSet?
        org.apache.tools.ant.types.FileSet?

Thanks very much,

Graham.

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Re: How to Write A Custom Path / Fileset

[Antoine Levy-Lambert <an...@gmx.de>]

Hello Graham,

> I want to write a custom Fileset type that reads input from a file.
> I don't want to support any nested elements, I just want to be able to 
> do something like this:
> 
>     <libraryset id="myLibraries" file="libraries.txt"/>
> 
> and have a custom class create a fileset based on the content of 
> libraries.txt.
> 
> So, I have two questions:
> 
> 1. Is it possible for me to do this (i.e. define a new DataType and use 
> it in a build file)?
> [Or do I have to write a custom Task that creates the fileset?]
> 
It is perfectly possible to create a new datatype.
To make your datatype known to ant, you need to use the
<typedef/> task (see the manual).


> 2. If the answer to 1. is 'Yes', where/what should I be extending?
> [Or, if the answer is 'No', what sort of FileSet should my task be 
> creating?]
>         org.apache.tools.ant.ProjectComponent?
>         org.apache.tools.ant.types.DataType?
>         org.apache.tools.ant.types.AbstractFileSet?
>         org.apache.tools.ant.types.FileSet?
> 
I am not too sure. I would extend DataType or AbstractFileSet.
Probably rather DataType, since I understand your library set is something
quite specific. 
Note that you might also have to create a special "Scanner" class (like
DirectoryScanner) to make the list of the files/dirs included in your
libraryset.

Antoine
> Thanks very much,
> 
> Graham.
> 

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