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Functional patterns for Java

There is a newer version: 5.5.0

package com.jnape.palatable.lambda.functions.builtin.fn3;

import com.jnape.palatable.lambda.functions.Fn3;
import com.jnape.palatable.lambda.functions.builtin.fn2.LTE;
import com.jnape.palatable.lambda.functions.specialized.BiPredicate;
import com.jnape.palatable.lambda.functions.specialized.Predicate;

import java.util.Comparator;

import static com.jnape.palatable.lambda.functions.builtin.fn3.GTWith.gtWith;
import static com.jnape.palatable.lambda.functions.specialized.Predicate.predicate;

/**
 * Given a {@link Comparator} from some type A and two values of type A,
 * return true if the second value is less than or equal to the first value in
 * terms of their mapped B results according to {@link Comparator#compare(Object, Object)};
 * otherwise, return false.
 *
 * @param  the value type
 * @see LTE
 * @see LTEBy
 * @see GTEWith
 */
public final class LTEWith implements Fn3, A, A, Boolean> {

    private static final LTEWith INSTANCE = new LTEWith<>();

    private LTEWith() {
    }

    @Override
    public BiPredicate apply(Comparator compareFn) {
        return Fn3.super.apply(compareFn)::apply;
    }

    @Override
    public Predicate apply(Comparator compareFn, A x) {
        return predicate(Fn3.super.apply(compareFn, x));
    }

    @Override
    public Boolean checkedApply(Comparator comparator, A a, A a2) {
        return !gtWith(comparator, a, a2);
    }

    @SuppressWarnings("unchecked")
    public static  LTEWith lteWith() {
        return (LTEWith) INSTANCE;
    }

    public static  BiPredicate lteWith(Comparator comparator) {
        return LTEWith.lteWith().apply(comparator);
    }

    public static  Predicate lteWith(Comparator comparator, A y) {
        return LTEWith.lteWith(comparator).apply(y);
    }

    public static  Boolean lteWith(Comparator comparator, A y, A x) {
        return lteWith(comparator, y).apply(x);
    }
}