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Link Intersystems Commons Util (lis-commons-util) is collection of reusable software components that extend the standard java.util components.

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package com.link_intersystems.util;

import java.util.Objects;
import java.util.function.Predicate;

/**
 * @author René Link {@literal }
 */
public class Predicates {

    public static  Predicate firstPredicate() {
        return new Predicate() {

            private boolean first = true;

            @Override
            public boolean test(T t) {
                if (first) {
                    first = false;
                    return true;
                }
                return false;
            }
        };
    }

    public static  Predicate equal(T equalTo) {
        return equal(Objects::equals, equalTo);
    }

    public static  Predicate equal(Equality equality, T equalTo) {
        return t -> equality.isEqual(t, equalTo);
    }
}