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Functional Programming for Java 8+ and compatible with the modular system of Java 9+.

There is a newer version: 0.5.10

/*
 * Copyright (C) 2021 iofairy, 
 *
 * 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 com.iofairy.pattern;

import java.util.Arrays;
import java.util.List;

/**
 * PatternIn for matching multi-values in one time.
 *
 * @since 0.0.1
 */
public class PatternIn {

    private List vs;

    /**
     * Match multi-values in one time. 

     * 判断 待匹配的值是否在集合中，也可用于一次匹配多个值：

     * Examples:
     * {@code
     * .when(in(0, 1, 2), v -> {System.out.println("match!");})
     *
     * // it is equivalent to the code below
     * int i = 1;
     * switch (i) {
     *     case 0:
     *     case 1:
     *     case 2:
     *         System.out.println("match!");
     *         break;
     *     default:
     *         ...
     * }
     * }
     *
     * @param values multi-values
     * @param     values type
     * @return PatternIn
     * @since 0.0.1
     */
    @SafeVarargs
    public static  PatternIn in(T... values) {
        PatternIn patternIn = new PatternIn<>();
        if (values == null) {
            patternIn.vs = Arrays.asList((T) null);
            return patternIn;
        }
        if (values.length == 0) throw new RuntimeException("The params's length must be greater than 0. 参数个数必须大于0");
        patternIn.vs = Arrays.asList(values);
        return patternIn;
    }

    public List getVs() {
        return vs;
    }

}