XOM API for Processing XML with Java

[Wolfgang Hoschek <whoschek AT lbl.gov>]

> > You just need a weak referenced Map as a cache, and use "double  
> > checking", or not, as I don't think it is that dangerous that  
> > there are two equal QNames floating around of which only one is  
> > saved in the cache...
>
> I'm not sure I understand what you mean with "double checking" and  
> why weak references would be significantly benefitial.
>
> Wolfgang.

If Elliotte would like to continue supporting JDK < 1.4 we could at  
runtime detect what kind of Map impls are available and choose in the  
following order of priority:

- bounded java.util.LinkedHashMap with LRU in the way I outlined. By  
far the best choice wrt. reliability and performance, in my  
experience.  (jdk >= 1.4)
- jakarta commons collections LRUHashMap or a custom stripped down  
version of it (jdk >= 1.2)
- java.util.WeakHashMap (jdk >= 1.2) without any bounds (not a  
particulary good choice, but will do the job correctly)

Wolfgang.