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From Steve Loughran <ste...@apache.org>
Subject Re: Importing and caching build files from a URL
Date Tue, 29 Nov 2005 22:18:32 GMT
Dominique Devienne wrote:
>>Now how do I get the parent? You can parse the path manually, but a URL can
>>be a jar resource, HTTP address, file location, newsgroup, partial url, etc.
>>
>>http://archive.ncsa.uiuc.edu/SDG/Software/Mosaic/Demo/url-primer.html
>>
>>Rather than parsing the path, it's easier and more explicit to simply
>>declare the root.
>>Also, this is more powerful since you can do relative imports from the root.
>>Solving two problems at once. Now the build writer decides how build files
>>are resolved. They can be relative to the orginal build file as described
>>above or relative to another root.
> 
> 
> As you can see from the code below and how it works, there is no
> parsing required. The URL class does it all, and behaves as the URL
> RFC dictactes. This is how HTML documents resolve each other. There's
> no reason to have any explicit root, although just like in HTML, one
> could change the default context for a document using a base-like HTML
> attribute.
> 
> The fact that you cannot "browse" a URL doesn't mean you can't know
> the parent (context) of a given URL, as the code clearly demonstrates
> IMHO. --DD


I believe that 'hierarchy' is a feature of protocols within a URL, which 
ftp, http, jar, file: support, but things like urn: uuid: that handle 
system thing, they dont.

-steve

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