Thanks for the reply. I do need to convert to java hashmaps and arraylists
because I'm trying to duplicate the testing of a clojure workflow being run
on a server thats pushing pure java context through it. So in my tests I
define a clojure map but want to javafy it to force errors to happen when I
try to evaluate the map as a function.
It's not clear to my how the postwalk-replace will work for converting
specific types (clojure maps and lists) to other types (java hashmaps and
array lists) recursively. Is the extend-protocol method discussed below not
the way to go?
On Friday, January 31, 2020 at 3:15:29 PM UTC-6, Alex Miller wrote:
>
> You don't need that - Clojure maps *are* Java maps (they implement
> java.util.Map) and you can pass them into most Java APIs as is (with the
> caveat that they are made for reading, not for writing).
>
> If you did really want to convert them to hash-maps or whatever, it's
> pretty easy to do so with a clojure.walk/postwalk-replace.
>
> On Friday, January 31, 2020 at 3:07:24 PM UTC-6, Jason Ross wrote:
>>
>> Hey I know this is super old post but what would the reverse look like,
>> eg. recursively convert Clojure to java map
>>
>> On Saturday, October 15, 2011 at 4:10:32 AM UTC-5, Baishampayan Ghose
>> wrote:
>>>
>>> > I have a Java Map contains Map of Maps/List (JSON like map) and have
>>> > to convert to Clojure map (This happens at Java - Clojure Interop), So
>>> > I have written a converter function 'as-clj-map' by modifying the
>>> > clojure walk functions, It works fine, but consume lot of cpu when the
>>> > data structure is quit big. Any suggestions to improve this code?
>>>
>>> What about using protocols for this job?
>>>
>>> (defprotocol ConvertibleToClojure
>>> (->clj [o]))
>>>
>>> (extend-protocol ConvertibleToClojure
>>> java.util.Map
>>> (->clj [o] (let [entries (.entrySet o)]
>>> (reduce (fn [m [^String k v]]
>>> (assoc m (keyword k) (->clj v)))
>>> {} entries)))
>>>
>>> java.util.List
>>> (->clj [o] (vec (map ->clj o)))
>>>
>>> java.lang.Object
>>> (->clj [o] o)
>>>
>>> nil
>>> (->clj [_] nil))
>>>
>>> (defn as-clj-map
>>> [m]
>>> (->clj m))
>>>
>>>
>>> Let me know if this works for you & meets your performance requirements.
>>>
>>> Regards,
>>> BG
>>>
>>> --
>>> Baishampayan Ghose
>>> b.ghose at gmail.com
>>>
>>>
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