source: src/main/java/agents/anac/y2010/Southampton/utils/Pair.java@ 1

package agents.anac.y2010.Southampton.utils;

public class Pair<A, B> {

        public final A fst;
        public final B snd;

        public Pair(A fst, B snd) {
                this.fst = fst;
                this.snd = snd;
        }

        public String toString() {
                return "Pair[" + fst + "," + snd + "]";
        }

        private static boolean equals(Object x, Object y) {
                return (x == null && y == null) || (x != null && x.equals(y));
        }

        public boolean equals(Object other) {
                return other instanceof Pair && equals(fst, ((Pair<?, ?>) other).fst) && equals(snd, ((Pair<?, ?>) other).snd);
        }

        public int hashCode() {
                if (fst == null)
                        return (snd == null) ? 0 : snd.hashCode() + 1;
                else if (snd == null)
                        return fst.hashCode() + 2;
                else
                        return fst.hashCode() * 17 + snd.hashCode();
        }

        public static <A, B> Pair<A, B> of(A a, B b) {
                return new Pair<A, B>(a, b);
        }
}