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jOOλ is part of the jOOQ series (along with jOOQ, jOOX, jOOR, jOOU) providing some useful extensions to Java 8 lambdas.

There is a newer version: 0.9.15

/**
 * Copyright (c) 2014-2016, Data Geekery GmbH, [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jooq.lambda.function;

import java.util.function.Predicate;

import org.jooq.lambda.Seq;

/**
 * @author Lukas Eder
 */
public final class Functions {

    /**
     * Negate a predicate.
     */
    public static final  Predicate not(Predicate predicate) {
        return predicate.negate();
    }

    /**
     * Negate a predicate.
     */
    @SafeVarargs
    public static final  Predicate and(Predicate... predicates) {
        return Seq.of(predicates).reduce(t -> true, (t1, t2) -> t1.and(t2));
    }

    /**
     * Negate a predicate.
     */
    @SafeVarargs
    public static final  Predicate or(Predicate... predicates) {
        return Seq.of(predicates).reduce(t -> false, (t1, t2) -> t1.or(t2));
    }
}