implementation of the "infer" method from nipafx' Twitch stream

clojureFor.java

	
	private Stream<TypedRelation> infer() {
		
		// Clojure's "for" macro works essentially just like this nested loop,
		// except that the resulting stream/sequence is lazily generated.
		
		Builder<TypedRelation> relations = Stream.builder();

		for (Article a1 : articles) {
			for (Article a2 :articles) {
				for (Genealogist g : genealogists) {
					
					Articles articlePair = new Articles(a1, a2);
					ArticleResearch research = new ArticleResearch(g, articlePair);
					relations.accept(research.infer());
					
				}
			}
		}

		return relations.build();
	}

infer.clj

;; based on https://puu.sh/F4jKF/d2aaadc17c.jpg

;; I took the freedom to work without most types,
;; except Genealogist since you want to have the option for
;; different implementations.


;; implementations would extend this protocol and implement the function `infer-from-research`
(defprotocol Genealogist
  (infer-from-research [this article-1 article-2]))

;; since we don't use classes and fields in clojure, I'll just pass in what we need
(defn infer [articles genealogists]
  (for [a1 articles
        a2 articles
        g genealogists]
    (infer-from-research g a1 a2)))





;; silly example implementation
(defrecord SillyGenealogist [name]
  Genealogist
  (infer-from-research [this article-1 article-2]
    (str "I'm " name ", and prefer neither " article-1 " nor " article-2 ".")))

;; example use:

(infer [1 2 3]
       [(->SillyGenealogist "A") (->SillyGenealogist "B")])

;; result =>
("I'm A, and prefer neither 1 nor 1."
 "I'm B, and prefer neither 1 nor 1."
 "I'm A, and prefer neither 1 nor 2."
 "I'm B, and prefer neither 1 nor 2."
 "I'm A, and prefer neither 1 nor 3."
 "I'm B, and prefer neither 1 nor 3."
 "I'm A, and prefer neither 2 nor 1."
 "I'm B, and prefer neither 2 nor 1."
 "I'm A, and prefer neither 2 nor 2."
 "I'm B, and prefer neither 2 nor 2."
 "I'm A, and prefer neither 2 nor 3."
 "I'm B, and prefer neither 2 nor 3."
 "I'm A, and prefer neither 3 nor 1."
 "I'm B, and prefer neither 3 nor 1."
 "I'm A, and prefer neither 3 nor 2."
 "I'm B, and prefer neither 3 nor 2."
 "I'm A, and prefer neither 3 nor 3."
 "I'm B, and prefer neither 3 nor 3.")