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Re: finding method efficiently

From: Robert Schuster
Subject: Re: finding method efficiently
Date: Tue, 28 Sep 2004 19:54:42 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de-AT; rv:1.7.2) Gecko/20040819

Thanks for all the replies.
I have rewritten the code that searches the methods using isAssignableFrom() (and feeling much better about it now).

Archie Cobbs wrote:

For an almost-example, look at Classpath's java.lang.Class.internalGetMethod().
Unfortunately it works exactly like Class.getMethod() which means finding put(Object, Object) is
not possible when having something else.

So it would be nice if we could write this algorithm once and for all
and make it public somewhere :-)
This may be a nice idea at first but for the XMLDecoder one special requirement spoils it. The XML data knows no primitives but wraps them always in their respective class. When testing whether a given argument type T can be assigned to a method's parameter type P I have to do something like this:

 if (P.isAssignableFrom(T)) -> good one, check next parameter
else if(T.isPrimitiveWrapperClass() && P.isAssignableFrom(getPrimitiveTypeFor(T)) --> good one, check next parameter
 else -> bail out, method signature is unsuitable

This is what it makes IMHO incompatible with a general solution. :-(


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