Java example source code file (edn.clj)

This example Java source code file (edn.clj) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

author, copyright, eclipse, halloway, hickey, license, print, public, returns, stuart, the, throwable, value, you

The edn.clj Java example source code

;   Copyright (c) Rich Hickey. All rights reserved.
;   The use and distribution terms for this software are covered by the
;   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;   which can be found in the file epl-v10.html at the root of this distribution.
;   By using this software in any fashion, you are agreeing to be bound by
;   the terms of this license.
;   You must not remove this notice, or any other, from this software.

; Author: Stuart Halloway


(ns clojure.test-clojure.edn
  (:require [clojure.test.generative :refer (defspec)]
            [clojure.test-clojure.generators :as cgen]
            [clojure.edn :as edn]))

(defn roundtrip
  "Print an object and read it back as edn. Returns rather than throws
   any exceptions."
  [o]
  (binding [*print-length* nil
            *print-dup* nil
            *print-level* nil]
    (try
     (-> o pr-str edn/read-string)
     (catch Throwable t t))))

(defspec types-that-should-roundtrip
  roundtrip
  [^{:tag cgen/ednable} o]
  (when-not (= o %)
    (throw (ex-info "Value cannot roundtrip, see ex-data" {:printed o :read %}))))

(defspec types-that-should-not-roundtrip
  roundtrip
  [^{:tag cgen/non-ednable} o]
  (when-not (instance? Throwable %)
    (throw (ex-info "edn/read should have thrown, see ex-data" {:printed o :read %}))))