/*
 * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
 *
 * 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 top.charles7c.cnadmin.common.util;

import java.util.Collection;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;

import cn.hutool.core.collection.CollUtil;

import top.charles7c.cnadmin.common.constant.StringConsts;

/**
 * Stream 工具类
 *
 * @author Lion Li（RuoYi-Vue-Plus）
 * @author Charles7c
 * @since 2022/12/22 19:51
 */
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class StreamUtils {

    /**
     * 将集合中的指定字段使用分隔符拼接成字符串
     *
     * @param collection
     *            集合
     * @param function
     *            字段方法
     * @param delimiter
     *            分隔符
     * @param <E>
     *            /
     * @return 拼接结果
     */
    public static <E> String join(Collection<E> collection, Function<E, String> function, CharSequence delimiter) {
        if (CollUtil.isEmpty(collection)) {
            return StringConsts.EMPTY;
        }
        return collection.stream().map(function).filter(Objects::nonNull).collect(Collectors.joining(delimiter));
    }
}
