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Date: Tue, 5 Jul 2022 11:00:27 +0800
Subject: [PATCH] =?UTF-8?q?add=20=E5=A2=9E=E5=8A=A0=20StreamUtils=20?=
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---
 .../com/ruoyi/common/utils/StreamUtils.java   | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 ruoyi-common/src/main/java/com/ruoyi/common/utils/StreamUtils.java

diff --git a/ruoyi-common/src/main/java/com/ruoyi/common/utils/StreamUtils.java b/ruoyi-common/src/main/java/com/ruoyi/common/utils/StreamUtils.java
new file mode 100644
index 000000000..dbb6f21e3
--- /dev/null
+++ b/ruoyi-common/src/main/java/com/ruoyi/common/utils/StreamUtils.java
@@ -0,0 +1,34 @@
+package com.ruoyi.common.utils;
+
+import cn.hutool.core.collection.CollStreamUtil;
+import cn.hutool.core.collection.CollUtil;
+
+import java.util.*;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+public class StreamUtils extends CollStreamUtil {
+
+    public static <E> List<E> filter(Collection<E> collection, Predicate<E> function) {
+        if (CollUtil.isEmpty(collection)) {
+            return Collections.emptyList();
+        }
+        return collection.stream().filter(function).collect(Collectors.toList());
+    }
+
+    public static <E> String join(Collection<E> collection,  Function<E, String> function) {
+        return join(collection, function, ",");
+    }
+
+    public static <E> String join(Collection<E> collection,  Function<E, String> function, CharSequence delimiter) {
+        if (CollUtil.isEmpty(collection)) {
+            return StringUtils.EMPTY;
+        }
+        return collection.stream().map(function).filter(Objects::nonNull).collect(Collectors.joining(delimiter));
+    }
+
+    public static <E> List<E> sorted(Collection<E> collection, Comparator<E> comparing) {
+        return collection.stream().sorted(comparing).collect(Collectors.toList());
+    }
+}