On Tue, Aug 13, 2013 at 4:01 PM, Oliver Heger <oliver.he...@oliver-heger.de>wrote:
> Hi all, > > recently, there was a discussion about extending the [csv] interface to > provide data conversions to different types. If such a use case is to be > supported, what would be the best approach to integrate a library like > [convert]? Well, the first step would be to release [Convert] 1.0 ;) It seems there would first need to be agreement that conversion belongs in [csv] in the first place, which is not the case for [CSV] 1.0. Personally, I'd like to focus on getting [CSV] 1.0 out the door and then adding features. It is good to talk about conversion now of course because it may affect the [CSV] APIs we provide. We do want to be backward compatible. Gary > Doing all required conversions manually would probably mean a > bunch of boilerplate code, wouldn't it? > > I had an idea how to automate this use case. Given an interface with a > method > T getValue(...); > where T is some base type like String or Object. Now we want to provide > other methods like > int getValueAsInt(...); > long getValueAsLong(...); > ... > > If there is an extended interface with all getValueAsXXX() methods, > couldn't the conversion be done by a proxy? The invocation handler would > obtain the return type of the invoked method in order to determine the > target class of the conversion. It would then call the basic getValue() > method with the provided arguments, convert the result, and return it. > > This is the general idea, in practice probably some filtering would be > needed to react only on certain method invocations. > > Do you think this use case is generic enough to support it in [convert] > (e.g. by providing an abstract base class of an invocation handler and > some convenience methods for creating proxy objects)? > > Oliver > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > > -- E-Mail: garydgreg...@gmail.com | ggreg...@apache.org Java Persistence with Hibernate, Second Edition<http://www.manning.com/bauer3/> JUnit in Action, Second Edition <http://www.manning.com/tahchiev/> Spring Batch in Action <http://www.manning.com/templier/> Blog: http://garygregory.wordpress.com Home: http://garygregory.com/ Tweet! http://twitter.com/GaryGregory
