forked from plusone/plusone-commons
57 lines
1.8 KiB
Java
57 lines
1.8 KiB
Java
/*
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* Copyright 2022-2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package xyz.zhouxy.plusone.commons.function;
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import java.util.function.Predicate;
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/**
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* Predicates
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*
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* <p>
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* {@link Predicate} 相关操作。
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* </p>
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*
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* @author <a href="https://gitee.com/zhouxy108">ZhouXY</a>
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* @since 0.1.0
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* @see Predicate
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*/
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public class Predicates {
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/**
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* 将 lambda 表达式或者方法引用指明为对应类型的 {@link Predicate} 对象。
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* 如将 {@code Objects::nonNull} 明确地指定为 {@code Predicate<String>}，
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* 使之可以链式调用 {@link Predicate#and(Predicate)}、{@link Predicate#or(Predicate)}
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* 等方法，连接其它 {@code Predicate<? super T>} 对象。
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*
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* <pre>
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* Predicate<String> predicate = Predicates.<String>of(Objects::nonNull)
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* .and(StringUtils::isNotEmpty);
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* </pre>
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*
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* @param <T> 目标类型
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* @param predicate Lambda 表达式
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* @return 传入的表达式自动成为 {@link Predicate} 实例
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*/
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public static <T> Predicate<T> of(Predicate<T> predicate) {
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return predicate;
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}
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private Predicates() {
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throw new IllegalStateException("Utility class");
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}
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}
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