content: /*
   *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
   *  <p>
   *  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
   *  <p>
   *  http://www.apache.org/licenses/LICENSE-2.0
   *  <p>
   *  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.agentsflex.core.util;
  
  import java.util.Map;
  import java.util.function.Function;
  
  public class MapUtil {
      private static final boolean IS_JDK8 = (8 == getJvmVersion0());
  
      private MapUtil() {
      }
  
      private static String tryTrim(String string) {
          return string != null ? string.trim() : "";
      }
  
      private static int getJvmVersion0() {
          int jvmVersion = -1;
          try {
              String javaSpecVer = tryTrim(System.getProperty("java.specification.version"));
              if (StringUtil.hasText(javaSpecVer)) {
                  if (javaSpecVer.startsWith("1.")) {
                      javaSpecVer = javaSpecVer.substring(2);
                  }
                  if (javaSpecVer.indexOf('.') == -1) {
                      jvmVersion = Integer.parseInt(javaSpecVer);
                  }
              }
          } catch (Throwable ignore) {
              // ignore
          }
          // default is jdk8
          if (jvmVersion == -1) {
              jvmVersion = 8;
          }
          return jvmVersion;
      }
  
      /**
       * A temporary workaround for Java 8 specific performance issue JDK-8161372 .<br>
       * This class should be removed once we drop Java 8 support.
       *
       * @see <a href=
       * "https://bugs.openjdk.java.net/browse/JDK-8161372">https://bugs.openjdk.java.net/browse/JDK-8161372</a>
       */
      public static <K, V> V computeIfAbsent(Map<K, V> map, K key, Function<K, V> mappingFunction) {
          if (IS_JDK8) {
              V value = map.get(key);
              if (value != null) {
                  return value;
              }
          }
          return map.computeIfAbsent(key, mappingFunction);
      }
  
  }
  