Java example source code file (vectors.clj)
The vectors.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, Daniel Solano Gómez
(ns clojure.test-clojure.vectors
(:use clojure.test))
(deftest test-reversed-vec
(let [r (range 6)
v (into (vector-of :int) r)
reversed (.rseq v)]
(testing "returns the right impl"
(is (= clojure.lang.APersistentVector$RSeq (class reversed))))
(testing "RSeq methods"
(is (= [5 4 3 2 1 0] reversed))
(is (= 5 (.index reversed)))
(is (= 5 (.first reversed)))
(is (= [4 3 2 1 0] (.next reversed)))
(is (= [3 2 1 0] (.. reversed next next)))
(is (= 6 (.count reversed))))
(testing "clojure calling through"
(is (= 5 (first reversed)))
(is (= 5 (nth reversed 0))))
(testing "empty reverses to nil"
(is (nil? (.. v empty rseq))))))
(deftest test-vecseq
(let [r (range 100)
vs (into (vector-of :int) r)
vs-1 (next vs)
vs-32 (.chunkedNext (seq vs))]
(testing "="
(are [a b] (= a b)
vs vs
vs-1 vs-1
vs-32 vs-32)
(are [a b] (not= a b)
vs vs-1
vs-1 vs
vs vs-32
vs-32 vs))
(testing "IPersistentCollection.empty"
(are [a] (identical? clojure.lang.PersistentList/EMPTY (.empty (seq a)))
vs vs-1 vs-32))
(testing "IPersistentCollection.cons"
(are [result input] (= result (.cons input :foo))
[:foo 1] (seq (into (vector-of :int) [1]))))
(testing "IPersistentCollection.count"
(are [ct s] (= ct (.count (seq s)))
100 vs
99 vs-1
68 vs-32)
;; can't manufacture this scenario: ASeq defers to Counted, but
;; LazySeq doesn't, so Counted never gets checked on reified seq below
#_(testing "hops to counted when available"
(is (= 200
(.count (concat
(seq vs)
(reify clojure.lang.ISeq
(seq [this] this)
clojure.lang.Counted
(count [_] 100))))))))
(testing "IPersistentCollection.equiv"
(are [a b] (true? (.equiv a b))
vs vs
vs-1 vs-1
vs-32 vs-32
vs r)
(are [a b] (false? (.equiv a b))
vs vs-1
vs-1 vs
vs vs-32
vs-32 vs
vs nil))
(testing "internal-reduce"
(is (= [99] (into [] (drop 99 vs)))))))
(deftest test-primitive-subvector-reduce
;; regression test for CLJ-1082
(is (== 60 (let [prim-vec (into (vector-of :long) (range 1000))]
(reduce + (subvec prim-vec 10 15))))))
(deftest test-vec-compare
(let [nums (range 1 100)
; randomly replaces a single item with the given value
rand-replace (fn[val]
(let [r (rand-int 99)]
(concat (take r nums) [val] (drop (inc r) nums))))
; all num sequences in map
num-seqs {:standard nums
:empty '()
; different lengths
:longer (concat nums [100])
:shorter (drop-last nums)
; greater by value
:first-greater (concat [100] (next nums))
:last-greater (concat (drop-last nums) [100])
:rand-greater-1 (rand-replace 100)
:rand-greater-2 (rand-replace 100)
:rand-greater-3 (rand-replace 100)
; lesser by value
:first-lesser (concat [0] (next nums))
:last-lesser (concat (drop-last nums) [0])
:rand-lesser-1 (rand-replace 0)
:rand-lesser-2 (rand-replace 0)
:rand-lesser-3 (rand-replace 0)}
; a way to create compare values based on num-seqs
create-vals (fn[base-val]
(zipmap (keys num-seqs)
(map #(into base-val %1) (vals num-seqs))))
; Vecs made of int primitives
int-vecs (create-vals (vector-of :int))
; Vecs made of long primitives
long-vecs (create-vals (vector-of :long))
; standard boxing vectors
regular-vecs (create-vals [])
; the standard int Vec for comparisons
int-vec (:standard int-vecs)]
(testing "compare"
(testing "identical"
(is (= 0 (compare int-vec int-vec))))
(testing "equivalent"
(are [x y] (= 0 (compare x y))
; standard
int-vec (:standard long-vecs)
(:standard long-vecs) int-vec
int-vec (:standard regular-vecs)
(:standard regular-vecs) int-vec
; empty
(:empty int-vecs) (:empty long-vecs)
(:empty long-vecs) (:empty int-vecs)))
(testing "lesser"
(are [x] (= -1 (compare int-vec x))
(:longer int-vecs)
(:longer long-vecs)
(:longer regular-vecs)
(:first-greater int-vecs)
(:first-greater long-vecs)
(:first-greater regular-vecs)
(:last-greater int-vecs)
(:last-greater long-vecs)
(:last-greater regular-vecs)
(:rand-greater-1 int-vecs)
(:rand-greater-1 long-vecs)
(:rand-greater-1 regular-vecs)
(:rand-greater-2 int-vecs)
(:rand-greater-2 long-vecs)
(:rand-greater-2 regular-vecs)
(:rand-greater-3 int-vecs)
(:rand-greater-3 long-vecs)
(:rand-greater-3 regular-vecs))
(are [x] (= -1 (compare x int-vec))
nil
(:empty int-vecs)
(:empty long-vecs)
(:empty regular-vecs)
(:shorter int-vecs)
(:shorter long-vecs)
(:shorter regular-vecs)
(:first-lesser int-vecs)
(:first-lesser long-vecs)
(:first-lesser regular-vecs)
(:last-lesser int-vecs)
(:last-lesser long-vecs)
(:last-lesser regular-vecs)
(:rand-lesser-1 int-vecs)
(:rand-lesser-1 long-vecs)
(:rand-lesser-1 regular-vecs)
(:rand-lesser-2 int-vecs)
(:rand-lesser-2 long-vecs)
(:rand-lesser-2 regular-vecs)
(:rand-lesser-3 int-vecs)
(:rand-lesser-3 long-vecs)
(:rand-lesser-3 regular-vecs)))
(testing "greater"
(are [x] (= 1 (compare int-vec x))
nil
(:empty int-vecs)
(:empty long-vecs)
(:empty regular-vecs)
(:shorter int-vecs)
(:shorter long-vecs)
(:shorter regular-vecs)
(:first-lesser int-vecs)
(:first-lesser long-vecs)
(:first-lesser regular-vecs)
(:last-lesser int-vecs)
(:last-lesser long-vecs)
(:last-lesser regular-vecs)
(:rand-lesser-1 int-vecs)
(:rand-lesser-1 long-vecs)
(:rand-lesser-1 regular-vecs)
(:rand-lesser-2 int-vecs)
(:rand-lesser-2 long-vecs)
(:rand-lesser-2 regular-vecs)
(:rand-lesser-3 int-vecs)
(:rand-lesser-3 long-vecs)
(:rand-lesser-3 regular-vecs))
(are [x] (= 1 (compare x int-vec))
(:longer int-vecs)
(:longer long-vecs)
(:longer regular-vecs)
(:first-greater int-vecs)
(:first-greater long-vecs)
(:first-greater regular-vecs)
(:last-greater int-vecs)
(:last-greater long-vecs)
(:last-greater regular-vecs)
(:rand-greater-1 int-vecs)
(:rand-greater-1 long-vecs)
(:rand-greater-1 regular-vecs)
(:rand-greater-2 int-vecs)
(:rand-greater-2 long-vecs)
(:rand-greater-2 regular-vecs)
(:rand-greater-3 int-vecs)
(:rand-greater-3 long-vecs)
(:rand-greater-3 regular-vecs))))
(testing "Comparable.compareTo"
(testing "incompatible"
(is (thrown? NullPointerException (.compareTo int-vec nil)))
(are [x] (thrown? ClassCastException (.compareTo int-vec x))
'()
{}
#{}
(sorted-set)
(sorted-map)
nums
1))
(testing "identical"
(is (= 0 (.compareTo int-vec int-vec))))
(testing "equivalent"
(are [x] (= 0 (.compareTo int-vec x))
(:standard long-vecs)
(:standard regular-vecs)))
(testing "lesser"
(are [x] (= -1 (.compareTo int-vec x))
(:longer int-vecs)
(:longer long-vecs)
(:longer regular-vecs)
(:first-greater int-vecs)
(:first-greater long-vecs)
(:first-greater regular-vecs)
(:last-greater int-vecs)
(:last-greater long-vecs)
(:last-greater regular-vecs)
(:rand-greater-1 int-vecs)
(:rand-greater-1 long-vecs)
(:rand-greater-1 regular-vecs)
(:rand-greater-2 int-vecs)
(:rand-greater-2 long-vecs)
(:rand-greater-2 regular-vecs)
(:rand-greater-3 int-vecs)
(:rand-greater-3 long-vecs)
(:rand-greater-3 regular-vecs)))
(testing "greater"
(are [x] (= 1 (.compareTo int-vec x))
(:empty int-vecs)
(:empty long-vecs)
(:empty regular-vecs)
(:shorter int-vecs)
(:shorter long-vecs)
(:shorter regular-vecs)
(:first-lesser int-vecs)
(:first-lesser long-vecs)
(:first-lesser regular-vecs)
(:last-lesser int-vecs)
(:last-lesser long-vecs)
(:last-lesser regular-vecs)
(:rand-lesser-1 int-vecs)
(:rand-lesser-1 long-vecs)
(:rand-lesser-1 regular-vecs)
(:rand-lesser-2 int-vecs)
(:rand-lesser-2 long-vecs)
(:rand-lesser-2 regular-vecs)
(:rand-lesser-3 int-vecs)
(:rand-lesser-3 long-vecs)
(:rand-lesser-3 regular-vecs))))))
(deftest test-vec-associative
(let [empty-v (vector-of :long)
v (into empty-v (range 1 6))]
(testing "Associative.containsKey"
(are [x] (.containsKey v x)
0 1 2 3 4)
(are [x] (not (.containsKey v x))
-1 -100 nil [] "" #"" #{} 5 100)
(are [x] (not (.containsKey empty-v x))
0 1))
(testing "contains?"
(are [x] (contains? v x)
0 2 4)
(are [x] (not (contains? v x))
-1 -100 nil "" 5 100)
(are [x] (not (contains? empty-v x))
0 1))
(testing "Associative.entryAt"
(are [idx val] (= (clojure.lang.MapEntry. idx val)
(.entryAt v idx))
0 1
2 3
4 5)
(are [idx] (nil? (.entryAt v idx))
-5 -1 5 10 nil "")
(are [idx] (nil? (.entryAt empty-v idx))
0 1))))
(deftest test-vec-creation
(testing "Plain (vector-of :type)"
(are [x] (and (empty? x) (instance? clojure.core.Vec x))
(vector-of :boolean)
(vector-of :byte)
(vector-of :short)
(vector-of :int)
(vector-of :long)
(vector-of :float)
(vector-of :double)
(vector-of :char))
(testing "with invalid type argument"
(are [x] (thrown? NullPointerException x)
(vector-of nil)
(vector-of Float/TYPE)
(vector-of 'int)
(vector-of ""))))
(testing "vector-like (vector-of :type x1 x2 x3 … xn)"
(are [vec gvec] (and (instance? clojure.core.Vec gvec)
(= (into (vector-of :int) vec) gvec)
(= vec gvec)
(= (hash vec) (hash gvec)))
[1] (vector-of :int 1)
[1 2] (vector-of :int 1 2)
[1 2 3] (vector-of :int 1 2 3)
[1 2 3 4] (vector-of :int 1 2 3 4)
[1 2 3 4 5] (vector-of :int 1 2 3 4 5)
[1 2 3 4 5 6] (vector-of :int 1 2 3 4 5 6)
(apply vector (range 1000)) (apply vector-of :int (range 1000))
[1 2 3] (vector-of :int 1M 2.0 3.1)
[97 98 99] (vector-of :int \a \b \c))
(testing "with null values"
(are [x] (thrown? NullPointerException x)
(vector-of :int nil)
(vector-of :int 1 nil)
(vector-of :int 1 2 nil)
(vector-of :int 1 2 3 nil)
(vector-of :int 1 2 3 4 nil)
(vector-of :int 1 2 3 4 5 nil)
(vector-of :int 1 2 3 4 5 6 nil)))
(testing "with unsupported values"
(are [x] (thrown? ClassCastException x)
(vector-of :int true)
(vector-of :int 1 2 3 4 5 false)
(vector-of :int {:a 1 :b 2})
(vector-of :int [1 2 3 4] [5 6])
(vector-of :int '(1 2 3 4))
(vector-of :int #{1 2 3 4})
(vector-of :int (sorted-set 1 2 3 4))
(vector-of :int 1 2 "3")
(vector-of :int "1" "2" "3")))))
(deftest empty-vector-equality
(let [colls [[] (vector-of :long) '()]]
(doseq [c1 colls, c2 colls]
(is (= c1 c2))
(is (.equals c1 c2)))))
(defn =vec
[expected v] (and (vector? v) (= expected v)))
(deftest test-mapv
(are [r c1] (=vec r (mapv + c1))
[1 2 3] [1 2 3])
(are [r c1 c2] (=vec r (mapv + c1 c2))
[2 3 4] [1 2 3] (repeat 1))
(are [r c1 c2 c3] (=vec r (mapv + c1 c2 c3))
[3 4 5] [1 2 3] (repeat 1) (repeat 1))
(are [r c1 c2 c3 c4] (=vec r (mapv + c1 c2 c3 c4))
[4 5 6] [1 2 3] [1 1 1] [1 1 1] [1 1 1]))
(deftest test-filterv
(are [r c1] (=vec r (filterv even? c1))
[] [1 3 5]
[2 4] [1 2 3 4 5]))
(deftest test-subvec
(let [v1 (vec (range 100))
v2 (subvec v1 50 57)]
(is (thrown? IndexOutOfBoundsException (v2 -1)))
(is (thrown? IndexOutOfBoundsException (v2 7)))
(is (= (v1 50) (v2 0)))
(is (= (v1 56) (v2 6)))))
(deftest test-vec
(is (= [1 2] (vec (first {1 2}))))
(is (= [0 1 2 3] (vec [0 1 2 3])))
(is (= [0 1 2 3] (vec (list 0 1 2 3))))
(is (= [0 1 2 3] (vec (sorted-set 0 1 2 3))))
(is (= [[1 2] [3 4]] (vec (sorted-map 1 2 3 4))))
(is (= [0 1 2 3] (vec (range 4))))
(is (= [\a \b \c \d] (vec "abcd")))
(is (= [0 1 2 3] (vec (object-array (range 4)))))
(is (= [1 2 3 4] (vec (eduction (map inc) (range 4)))))
(is (= [0 1 2 3] (vec (reify clojure.lang.IReduceInit
(reduce [_ f start]
(reduce f start (range 4))))))))
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