(ns demo.protectedfield
[:gen-class
:extends clojure.lang.ARef
:exposes {validator {:get getvalidator :set setvalidator}}])
Is this what you are looking for?
After compile, you will get a class that extends clojure.lang.ARef
(compile 'demo.protectedfield)
(instance? clojure.lang.ARef (demo.protectedfield.))
and has a pair of public getter/setter.
(require '[clojure.reflect :refer [reflect]])
(->> (reflect demo.protectedfield)
:members (filter (comp '#{getvalidator setvalidator} :name)))
({:name getvalidator,
:return-type clojure.lang.IFn,
:declaring-class demo.protectedfield,
:parameter-types [],
:exception-types [],
:flags #{:public}}
{:name setvalidator,
:return-type void,
:declaring-class demo.protectedfield,
:parameter-types [clojure.lang.IFn],
:exception-types [],
:flags #{:public}})
Or, as the last resort, use reflection:
(defn field [^Class c name]
(let [field (doto (.getDeclaredField c name) (.setAccessible true))]
(fn
([] (.getType field))
([x] (.get field x))
([x v] (.set field x v)))))
(def validator
(field clojure.lang.ARef "validator"))
Now, *validator* could get and set the corresponding protected field of
clojure.lang.ARef:
(def forbid (constantly false))
(def permit (constantly true))
(let [v (atom 0)]
(assert (nil? (get-validator v)))
(assert (nil? (validator v)))
(validator v permit)
(assert (identical? permit (get-validator v)))
(assert (identical? permit (validator v))))
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