Just because no else has said it yet, clojure vectors, lists and seqs all implement the read part of the interface java.util.List, and your java API should most likely be refactored to use the List interface instead of ArrayList if it isn't already.
If that's the case, and it's not trying to mutate what's passed in (any well-designed java api should only read from collections or defensively copy first), you can just pass the clojure collection to the java api as is. On Tue, Jan 26, 2016 at 5:58 PM Beau Fabry <imf...@gmail.com> wrote: > Tell the compiler that the type you're passing to the constructor is a > Collection, so it will know which constructor to use without reflection. > > (set! *warn-on-reflection* true) > => true > (import '(java.util ArrayList Collection)) > => java.util.Collection > (ArrayList. (list 1 2)) > Reflection warning, > /Users/bfabry/Library/Caches/IdeaIC15/tmp/form-init108635367050123227.clj:1:1 > - call to java.util.ArrayList ctor can't be resolved. > => [1 2] > (ArrayList. ^Collection (list 1 2)) > => [1 2] > > > > On Tuesday, January 26, 2016 at 1:56:19 PM UTC-8, Ritchie Cai wrote: >> >> Quoting for small example like I mention is not an issue, but in general, >> I need to pass an vector or list, since that's what I get, in which case I >> cannot quote. >> >> On Tuesday, January 26, 2016 at 3:52:17 PM UTC-6, Michael Willis wrote: >>> >>> What's not practical about quoting? I thought it was considered more >>> idiomatic than doing (list ...) >>> >>> On Sunday, January 17, 2016 at 2:48:29 PM UTC-6, Ritchie Cai wrote: >>>> >>>> Hi all, >>>> >>>> I'm trying to create a Java ArrayList object from a Clojure collection >>>> to pass to another Java API. I get reflection warnings when the elements >>>> are not primitive types, in this case I'm using SparseIndexedVector >>>> class from vectorz library. >>>> >>>> (ArrayList. [c0 c1 c2]) >>>> Reflection warning, *cider-repl localhost*:77:11 - call to >>>> java.util.ArrayList ctor can't be resolved. >>>> >>>> where c0 c1 c2 are of type SparseIndexedVector. Alternatively, I can >>>> create create ArrayList then add elements one by one in a loop. >>>> >>>> (doto (ArrayList.) >>>> (.add c0) >>>> (.add c1) >>>> (.add c2)) >>>> >>>> But I'm wondering if there is away to get rid of the the reflection >>>> warning when calling ArrayList constructor. >>>> >>>> Also, quoting a list will not give reflection warning: >>>> >>>> (ArrayList. '(c0 c1 c2)) ;; no warning >>>> >>>> (ArrayList. (list c0 c1 c2)) >>>> Reflection warning, *cider-repl localhost*:77:11 - call to >>>> java.util.ArrayList ctor can't be resolved. >>>> >>>> However, quoting is not very practical. >>>> >>>> Thanks >>>> Ritchie >>>> >>>> -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
