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   /*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.handler.ssl;
  
  import io.netty.util.internal.UnstableApi;
  
  /**
   * Event that is fired once we did a selection of a {@link SslContext} based on the {@code SNI hostname},
   * which may be because it was successful or there was an error.
   */
  @UnstableApi
  public final class SniCompletionEvent extends SslCompletionEvent {
      private final String hostname;
  
      public SniCompletionEvent(String hostname) {
          this.hostname = hostname;
      }
  
      public SniCompletionEvent(String hostname, Throwable cause) {
          super(cause);
          this.hostname = hostname;
      }
  
      public SniCompletionEvent(Throwable cause) {
          this(null, cause);
      }
  
      /**
       * Returns the SNI hostname send by the client if we were able to parse it, {@code null} otherwise.
       */
      public String hostname() {
          return hostname;
      }
  
      @Override
      public String toString() {
          final Throwable cause = cause();
          return cause == null ? getClass().getSimpleName() + "(SUCCESS='"  + hostname + "'\")":
                  getClass().getSimpleName() +  '(' + cause + ')';
      }
  }