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.bifromq.basekv.raft.exception;
  
  /**
   * Exception thrown during snapshot operations in the Raft protocol.
   * This exception can indicate that a snapshot is obsolete or has other issues.
   */
  public class SnapshotException extends RuntimeException {
      private SnapshotException(String message) {
          super(message);
      }
  
      private SnapshotException(Throwable e) {
          super(e);
      }
  
      public static ObsoleteSnapshotException obsolete() {
          return new ObsoleteSnapshotException();
      }
  
      public static NoSnapshotException noSnapshot() {
          return new NoSnapshotException();
      }
  
      /**
       * Exception indicating that no snapshot is available for installation.
       */
      public static class NoSnapshotException extends SnapshotException {
          private NoSnapshotException() {
              super("No snapshot available");
          }
      }
  
      /**
       * Exception indicating that the snapshot is obsolete by a newer snapshot during installation.
       */
      public static class ObsoleteSnapshotException extends SnapshotException {
          private ObsoleteSnapshotException() {
              super("The installed snapshot has been obsoleted by a newer snapshot");
          }
      }
  }
  