content: /*
   * Copyright 2010 Proofpoint, Inc.
   *
   * 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 io.airlift.discovery.store;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.primitives.Longs;
  
  import com.google.errorprone.annotations.Immutable;
  
  @Immutable
  public class Version
  {
      private final long sequence;
  
      @JsonCreator
      public Version(@JsonProperty("sequence") long sequence)
      {
          this.sequence = sequence;
      }
  
      @JsonProperty
      public long getSequence()
      {
          return sequence;
      }
  
      public Occurs compare(Version other)
      {
          int comparison = Longs.compare(sequence, other.sequence);
  
          if (comparison < 0) {
              return Occurs.BEFORE;
          }
          if (comparison > 0) {
              return Occurs.AFTER;
          }
  
          return Occurs.SAME;
      }
  
      public enum Occurs
      {
          BEFORE, SAME, CONCURRENT, AFTER
      }
  
      @Override
      public boolean equals(Object o)
      {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          Version version = (Version) o;
  
          return sequence == version.sequence;
      }
  
      @Override
      public int hashCode()
      {
          return (int) (sequence ^ (sequence >>> 32));
      }
  }
  