content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * 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 me.ahoo.cosid.segment.grouped;
  
  import com.google.errorprone.annotations.ThreadSafe;
  import jakarta.annotation.Nullable;
  
  import java.util.Objects;
  
  @ThreadSafe
  public final class GroupedAccessor {
      private static final ThreadLocal<GroupedKey> CURRENT = new ThreadLocal<>();
      
      public static void set(GroupedKey groupedKey) {
          CURRENT.set(groupedKey);
      }
      
      public static void setIfNotNever(GroupedKey groupedKey) {
          if (GroupedKey.NEVER.equals(groupedKey)) {
              return;
          }
          set(groupedKey);
      }
      
      @Nullable
      public static GroupedKey get() {
          return CURRENT.get();
      }
      
      public static GroupedKey requiredGet() {
          return Objects.requireNonNull(get(), "The current thread has not set the GroupedKey.");
      }
      
      public static void clear() {
          CURRENT.remove();
      }
  }
  