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Double Indirection in DOMImplementationRegistry

From: Elliotte Rusty Harold <elharo@metalab.unc.edu>
Date: Sun, 20 Jan 2002 12:13:39 -0500
Message-ID: <3C4AFAC3.47B45E30@metalab.unc.edu>
To: www-dom@w3.org
In the Java bootstrapping code included in the latest DOM Level 3 core
draft, I'm trying to understand why there's an additional layer of
indirection. Currently org.w3c.dom.DOMImplementationSourceList contains
a list of DOMImplementationSource objects which are responsible for
finding the DOMImplementation classes that provide certain features.
What does this gain vis-a-vis a org.w3c.dom.DOMImplementation property
that contains a list of DOMImplementation classes? Why add the
additional indirection? At first, I thought this was so
DOMImplementationSource could match feature requests with particular
DOMImplementations, but this logic could easily fit into
DOMImplementationRegistry.getDOMImplementation(). Why add the extra
class? What does DOMImplementationSource buy DOM?

| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
|               Java I/O (O'Reilly & Associates, 1999)               |
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Received on Sunday, 20 January 2002 12:13:25 UTC

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