[ http://issues.apache.org/jira/browse/COLLECTIONS-110?page=comments#action_12414304 ]
Sergei Ivanov commented on COLLECTIONS-110: ------------------------------------------- Another problem we are going to face is that some of the current implementation decisions are not compatible with generics. First of all, static singleton instances of e.g. various EmptyIterator's and trivial functors cannot be made generic. They can be wrapped in a static generified getInstance() method, which would still contain an unchecked cast. Second, there are many "graceful fallback" cases, which become tricky with generics. Let's take TransformIterator as an example. Constructing it without a transformer is equivalent to constructing it with a NOPTransformer. However, NOPTransformer introduces a certain relation between expected input and output types: output type must be assignable from input type. There is no such relation (in fact, no relation at all) between generic parameter types for generic Transformer interface. > [collections] Support parametized classes with commons.collections. > ------------------------------------------------------------------- > > Key: COLLECTIONS-110 > URL: http://issues.apache.org/jira/browse/COLLECTIONS-110 > Project: Commons Collections > Type: Bug > Environment: Operating System: other > Platform: Other > Reporter: Colbert Philippe > > It's time to create a parallel version of commons.collections to support > parametized classes of each container class and abstract class. It's not > that > hard. There is a 23 PDF document on Sun Java website describing in detail > how > it should be done and what to watch out for. > I already converted a few classes from commons.collection privately for my > own > needs. Once you get the hang of it, it's a rather quick process. > I am even willing to volunteer my time to do some more but I need the > collaboration of some of the original programmers to watch over things. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
