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From Berin Loritsch <blorit...@apache.org>
Subject Re: new method Configuration.containsAttribute() ?
Date Wed, 12 Dec 2001 20:25:14 GMT
Vincent Massol wrote:

> ah, that's what I was missing. It never occurred to me that it was valid
> to pass a null value ! However, it does not seem a very nice way of
> doing it as it does not reflect what you're trying to achieve (checking
> if an attribute has been defined).


> So, in conclusion, forget my previous proposition and instead, what
> would you think of :
> public Hashtable getAttributes();


The configuration API needs to remain immutable.  You also still didn't
answer the question of *why* you needed to test if an attribute was

A component should be able to configure itself with default values, and
use the passed in Configuration object to override those defaults.  If
you want to test for a missing attribute, I have to ask what it affords
you over defaulting your values.

For instance, if you have a component that will run a background thread
depending on the value of an attribute, I would rather see something
like this:

boolean bgThread = configuration.getAttributeAsBoolean("use-thread", false);

Do you see how that works?

I am still trying to imagine *why* you need the attributeExists("use-thread");
type functionality.


"They that give up essential liberty to obtain a little temporary safety
  deserve neither liberty nor safety."
                 - Benjamin Franklin

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