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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.dubbo.common.function;

import java.util.function.Predicate;

import static java.util.stream.Stream.of;

/**
 * The utilities class for Java {@link Predicate}
 *
 * @since 2.7.5
 */
public interface Predicates {

    Predicate[] EMPTY_ARRAY = new Predicate[0];

    /**
     * {@link Predicate} always return true
     *
     * @param  the type to test
     * @return true
     */
    static  Predicate alwaysTrue() {
        return e -> true;
    }

    /**
     * {@link Predicate} always return false
     *
     * @param  the type to test
     * @return false
     */
    static  Predicate alwaysFalse() {
        return e -> false;
    }

    /**
     * a composed predicate that represents a short-circuiting logical AND of {@link Predicate predicates}
     *
     * @param predicates {@link Predicate predicates}
     * @param         the type to test
     * @return non-null
     */
    static  Predicate and(Predicate... predicates) {
        return of(predicates).reduce(Predicate::and).orElseGet(Predicates::alwaysTrue);
    }

    /**
     * a composed predicate that represents a short-circuiting logical OR of {@link Predicate predicates}
     *
     * @param predicates {@link Predicate predicates}
     * @param         the detected type
     * @return non-null
     */
    static  Predicate or(Predicate... predicates) {
        return of(predicates).reduce(Predicate::or).orElse(e -> true);
    }
}