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.kafka.common;
  
  import org.apache.kafka.common.annotation.InterfaceStability;
  
  import java.util.Arrays;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  /**
   * The group state.
   * <p>
   * The following table shows the correspondence between the group states and types.
   * <table>
   *     <thead>
   *         <tr><th>State</th><th>Classic group</th><th>Consumer group</th><th>Share group</th><th>Streams group</th></tr>
   *     </thead>
   *     <tbody>
   *         <tr><td>UNKNOWN</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr>
   *         <tr><td>PREPARING_REBALANCE</td><td>Yes</td><td>Yes</td><td></td><td></td></tr>
   *         <tr><td>COMPLETING_REBALANCE</td><td>Yes</td><td>Yes</td><td></td><td></td></tr>
   *         <tr><td>STABLE</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr>
   *         <tr><td>DEAD</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr>
   *         <tr><td>EMPTY</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td></tr>
   *         <tr><td>ASSIGNING</td><td></td><td>Yes</td><td></td><td>Yes</td></tr>
   *         <tr><td>RECONCILING</td><td></td><td>Yes</td><td></td><td>Yes</td></tr>
   *         <tr><td>NOT_READY</td><td></td><td></td><td></td><td>Yes</td></tr>
   *     </tbody>
   * </table>
   */
  @InterfaceStability.Evolving
  public enum GroupState {
      UNKNOWN("Unknown"),
      PREPARING_REBALANCE("PreparingRebalance"),
      COMPLETING_REBALANCE("CompletingRebalance"),
      STABLE("Stable"),
      DEAD("Dead"),
      EMPTY("Empty"),
      ASSIGNING("Assigning"),
      RECONCILING("Reconciling"),
      NOT_READY("NotReady");
  
      private static final Map<String, GroupState> NAME_TO_ENUM = Arrays.stream(values())
              .collect(Collectors.toMap(state -> state.name.toUpperCase(Locale.ROOT), Function.identity()));
  
      private final String name;
  
      GroupState(String name) {
          this.name = name;
      }
  
      /**
       * Case-insensitive group state lookup by string name.
       */
      public static GroupState parse(String name) {
          GroupState state = NAME_TO_ENUM.get(name.toUpperCase(Locale.ROOT));
          return state == null ? UNKNOWN : state;
      }
  
      public static Set<GroupState> groupStatesForType(GroupType type) {
          if (type == GroupType.CLASSIC) {
              return Set.of(PREPARING_REBALANCE, COMPLETING_REBALANCE, STABLE, DEAD, EMPTY);
          } else if (type == GroupType.CONSUMER) {
              return Set.of(PREPARING_REBALANCE, COMPLETING_REBALANCE, STABLE, DEAD, EMPTY, ASSIGNING, RECONCILING);
          } else if (type == GroupType.STREAMS) {
              return Set.of(STABLE, DEAD, EMPTY, ASSIGNING, RECONCILING, NOT_READY);
          } else if (type == GroupType.SHARE) {
              return Set.of(STABLE, DEAD, EMPTY);
          } else {
              throw new IllegalArgumentException("Group type not known");
          }
      }
  
      @Override
      public String toString() {
          return name;
      }
  }
  