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specification.clj
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specification.clj
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(ns configurati.specification
(:require
[configurati.parameters :refer [default validate convert]]))
(defprotocol Evaluatable
(evaluate [configuration-specification configuration-source]))
(defn- evaluation-result [configuration-source]
{:missing []
:unconvertible []
:original configuration-source
:evaluated {}})
(defn- error-free? [evaluation-result]
(and
(empty? (:missing evaluation-result))
(empty? (:unconvertible evaluation-result))))
(defn- with-error [evaluation-result name error-type]
(update-in evaluation-result [error-type] #(conj % name)))
(defn- with-value [evaluation-result name value]
(update-in evaluation-result [:evaluated] #(assoc % name value)))
(defn- determine-evaluation-result [parameters configuration-source key-fn]
(reduce
(fn [evaluation-result parameter]
(let [name (:name parameter)
initial (name configuration-source)
defaulted (default parameter initial)
validity (validate parameter defaulted)
conversion (convert parameter defaulted)
converted (:value conversion)
validation-error (:error validity)
conversion-error (:error conversion)]
(cond
validation-error (with-error evaluation-result name validation-error)
conversion-error (with-error evaluation-result name conversion-error)
:default (with-value evaluation-result (key-fn name) converted))))
(evaluation-result configuration-source)
parameters))
(defrecord ConfigurationSpecification [parameters key-fn]
Evaluatable
(evaluate [_ configuration-source]
(let [evaluation-result (determine-evaluation-result
parameters
configuration-source
key-fn)
valid? (error-free? evaluation-result)
missing-parameters (:missing evaluation-result)
unconvertible-parameters (:unconvertible evaluation-result)]
(if valid?
(:evaluated evaluation-result)
(throw (ex-info
(str "Configuration evaluation failed. "
"Missing parameters: " missing-parameters ", "
"unconvertible parameters: " unconvertible-parameters ".")
evaluation-result))))))