> > On 25/05/2015, at 05:37, Johann Werner <j...@oyosys.com> wrote: > > Hi Mark, > > NSKeyValueCoding.DefaultImplementation is a static class which renders it > quite difficult to modify or replace some functionality. One way to do so > would be to reimplement the class with your modifications and put that prior > to the original class on your build path so that it is loaded before the > original one. This procedure is used at some places in Wonder code already. > > Another, less drastic, way would be to create a subclass of Optional. That > ERXOptional could then implement NSKeyValueCoding to fire up a key path on > its internal value (or null) instead of itself. That would fix > valueForKey(Path) on chains where ERXOptional objects are included. Of course > this doesn’t work where you have no control on what optional class is > used/returned.
Unfortunately, Optional is final and cannot be extended. :( Cheers, Henrique > > jw > > >> Am 23.05.2015 um 23:24 schrieb Mark Wardle <m...@wardle.org>: >> >> Dear all, >> >> I’ve migrated to java 8 in development and deployment and am now dabbling >> with new “features”. >> >> Optionals seem a potentially good way of documenting nullability although >> the syntax is currently rather cumbersome it seems likely that in future >> versions, the syntax will improve. >> >> However, key value coding fails when an object is encapsulated by an >> Optional. Intuitively, these should be unwrapped during KVC so that “normal” >> behaviour continues - i.e. as KVC gracefully handles null pointers in >> arbitrary key paths it should gracefully handle optionals containing either >> a value or null. >> >> How would the handling of KVC be patched for future java versions? Is this >> something fixable now? Does all KVC work via >> NSKeyValueCoding.DefaultImplementation or are there multiple >> implementations? I used to have a java decompiler working but haven’t set >> this up since upgrading eclipse so it has been difficult to fathom the >> internals. >> >> Mark >> >> -- >> Dr. Mark Wardle >> Consultant Neurologist, University Hospital Wales, Cardiff, UK >> Deputy Sub-Dean for Assessments and Honorary Lecturer, Cardiff University >> Email: mark.war...@wales.nhs.uk or m...@wardle.org Twitter: @mwardle >> Telephone: 02920745274 (secretary) or facsimile: 02920744166 > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/webobjects-dev/hprange%40gmail.com > > This email sent to hpra...@gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
