添加 UnifiedResponse 以替代 RestfulResult；重构 RegexUtil。 (#4)

Reviewed-on: http://zhouxy.xyz:3000/plusone/plusone-commons/pulls/4

src/main/java/xyz/zhouxy/plusone/commons/util/ConcurrentHashMapUtil.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022-2023 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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 xyz.zhouxy.plusone.commons.util;
+
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+
+import xyz.zhouxy.plusone.commons.base.JRE;
+
+public class ConcurrentHashMapUtil { // TODO 添加文档注释
+
+    public static <K, V> V computIfAbsent(ConcurrentHashMap<K, V> map, final K key, final Function<? super K, ? extends V> mappingFunction) {
+        if (JRE.isJava8()) {
+            Objects.requireNonNull(mappingFunction);
+            V v = map.get(key);
+            if (null == v) {
+                v = mappingFunction.apply(key);
+                if (null == v) {
+                    return null;
+                }
+                final V res = map.putIfAbsent(key, v);
+                if (null != res) {
+                    return res;
+                }
+            }
+            return v;
+        } else {
+            return map.computeIfAbsent(key, mappingFunction);
+        }
+    }
+
+    private ConcurrentHashMapUtil() {
+        throw new IllegalStateException("Utility class");
+    }
+}