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Functional Java is an open source library that supports closures for the Java programming language
package fj.data.fingertrees;
import fj.P;
import fj.P3;
import fj.data.Option;
import fj.data.vector.V2;
import fj.F;
import fj.P2;
import static fj.data.Option.none;
import static fj.data.Option.some;
import static fj.data.fingertrees.FingerTree.mkTree;
/**
* A two-element inner tree node.
*/
public final class Node2 extends Node {
private final V2 as;
Node2(final Measured m, final V2 as) {
super(m, m.sum(m.measure(as._1()), m.measure(as._2())));
this.as = as;
}
@Override public B foldRight(final F> aff, final B z) {
return aff.f(as._1()).f(aff.f(as._2()).f(z));
}
@Override public B foldLeft(final F> bff, final B z) {
return bff.f(bff.f(z).f(as._1())).f(as._2());
}
public Digit toDigit() {
return new Two(measured(), as);
}
P3>, A, Option>> split1(final F predicate, final V acc) {
final Measured m = measured();
final MakeTree mk = mkTree(m);
if (predicate.f(m.sum(acc, m.measure().f(as._1())))) {
return P.p(none(), as._1(), some(mk.one(as._2())));
} else {
return P.p(some(mk.one(as._1())), as._2(), none());
}
}
@Override public P2 lookup(final F o, final int i) {
final F m = measured().measure();
final int s1 = o.f(m.f(as._1()));
if (i < s1) {
return P.p(i, as._1());
} else {
return P.p(i - s1, as._2());
}
}
public B match(final F, B> n2, final F, B> n3) {
return n2.f(this);
}
public V2 toVector() {
return as;
}
}