35 lines
1.2 KiB
Java
35 lines
1.2 KiB
Java
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package com.ruoyi.common.utils;
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import cn.hutool.core.collection.CollStreamUtil;
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import cn.hutool.core.collection.CollUtil;
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import java.util.*;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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public class StreamUtils extends CollStreamUtil {
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public static <E> List<E> filter(Collection<E> collection, Predicate<E> function) {
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if (CollUtil.isEmpty(collection)) {
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return Collections.emptyList();
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}
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return collection.stream().filter(function).collect(Collectors.toList());
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}
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public static <E> String join(Collection<E> collection, Function<E, String> function) {
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return join(collection, function, ",");
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}
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public static <E> String join(Collection<E> collection, Function<E, String> function, CharSequence delimiter) {
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if (CollUtil.isEmpty(collection)) {
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return StringUtils.EMPTY;
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}
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return collection.stream().map(function).filter(Objects::nonNull).collect(Collectors.joining(delimiter));
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}
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public static <E> List<E> sorted(Collection<E> collection, Comparator<E> comparing) {
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return collection.stream().sorted(comparing).collect(Collectors.toList());
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}
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}
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