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 me.ahoo.cosid.segment.IdSegment;
  import me.ahoo.cosid.util.Clock;
  
  import com.google.common.base.MoreObjects;
  
  import java.util.Objects;
  
  public final class GroupedKey {
      public static final GroupedKey NEVER = new GroupedKey("", IdSegment.TIME_TO_LIVE_FOREVER);
      private final String key;
      private final long ttlAt;
      
      public GroupedKey(String key, long ttlAt) {
          this.key = key;
          this.ttlAt = ttlAt;
      }
      
      public String getKey() {
          return key;
      }
      
      /**
       * get ttlAt of group.
       *
       * @return ttlAt
       * @see IdSegment#getTtl()
       */
      public long getTtlAt() {
          return ttlAt;
      }
      
      public long ttl() {
          return ttlAt - Clock.CACHE.secondTime();
      }
      
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          GroupedKey that = (GroupedKey) o;
          return ttlAt == that.ttlAt && Objects.equals(key, that.key);
      }
      
      @Override
      public int hashCode() {
          return Objects.hash(key, ttlAt);
      }
      
      @Override
      public String toString() {
          return MoreObjects.toStringHelper(this)
              .add("key", key)
              .add("ttlAt", ttlAt)
              .toString();
      }
      
      public static GroupedKey forever(String key) {
          return new GroupedKey(key, IdSegment.TIME_TO_LIVE_FOREVER);
      }
  }
  
  