Dear list,
I have working code for 2 inputs, but I am trying to write an
idiomatic version, where the result is that a function named "read-
files-into-memory" takes a variable number of file names and parses
the json. My code works well until I try to wrap my stand alone call
to map into my "read-files-into-memory" function.
My stand alone call that works correctly is: (map #(read-json-filename
%1) fnames)
However, putting this into a wrapper function doesn't appear to give
each item piecemeal and results in the java.io.FileReader complaint of
"No matching ctor" for the underlying call.
Here are the details:
;; paths to 2 little testing files
proj=> fnames
["/home/avram/devel/scratch/a.json" "/home/avram/devel/scratch/
b.json"]
;; function that can read one file
proj=> (defn read-json-filename
[ filename ]
(clojure.contrib.json/read-json (FileReader. filename )))
#'proj/read-json-filename
;; Proof of concept: it works when passed a vector of filenames
proj=> (map #(read-json-filename %1) fnames)
({:metric1 {:section "a1", :runid "run-a", :value "123"}, :metric2
{:section "a2", :runid "run-a", :value "123.45"}, :metric3 {:section
"a3", :runid "run-a", :value "[1,2,3,4,5,6,7,8,9]"}} {:metric1
{:section "b1", :runid "run-b", :value "456"}, :metric2 {:section
"b2", :runid "run-b", :value "789.1011"}, :metric3 {:section
"b3", :runid "run-b", :value "[11,21,31,41,51,61,71,81,91]"}})
;; Intended to be a wrapper that calls map like above..
proj=> (defn read-files-into-memory
[ & filenames ]
(print filenames)
(map #(read-json-filename %1) filenames))
#'proj/read-files-into-memory
;; …but it doesn't work
proj=> (read-files-into-memory fnames)
java.lang.IllegalArgumentException: No matching ctor found for class
java.io.FileReader
I thought the wrapper version was identical to the stand alone call,
but apparently not.
What changes are needed in "read-files-into-memory" ?
Many thanks,
Avram
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