content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.tcm.membership;
  
  import java.util.EnumSet;
  import java.util.Set;
  
  public enum NodeState
  {
      REGISTERED,
      BOOTSTRAPPING,
      BOOT_REPLACING,
      JOINED,
      LEAVING,
      LEFT,
      MOVING;
      private static final Set<NodeState> PRE_JOIN_STATES = EnumSet.of(REGISTERED, BOOTSTRAPPING, BOOT_REPLACING);
      private static final Set<NodeState> BOOTSTRAP_STATES = EnumSet.of(BOOTSTRAPPING, BOOT_REPLACING);
  
      public static boolean isPreJoin(NodeState state)
      {
          return (state == null || PRE_JOIN_STATES.contains(state));
      }
  
      public static boolean isBootstrap(NodeState state)
      {
          return (state != null && BOOTSTRAP_STATES.contains(state));
      }
      // TODO: probably we can make these states even more nuanced, and track which step each node is on to have a simpler representation of transition states
  }
  