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.stat;
  
  import jakarta.annotation.Nullable;
  
  public interface Stat {
  
      String getKind();
  
      @Nullable
      default Stat getActual() {
          return null;
      }
  
      static Stat simple(String kind, @Nullable Stat actual) {
          return new SimpleStat(kind, actual);
      }
  
      static Stat simple(String kind) {
          return simple(kind, null);
      }
  }
  