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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.ObjectUtil;
  
  public abstract class SslCompletionEvent {
  
      private final Throwable cause;
  
      SslCompletionEvent() {
          cause = null;
      }
  
      SslCompletionEvent(Throwable cause) {
          this.cause = ObjectUtil.checkNotNull(cause, "cause");
      }
  
      /**
       * Return {@code true} if the completion was successful
       */
      public final boolean isSuccess() {
          return cause == null;
      }
  
      /**
       * Return the {@link Throwable} if {@link #isSuccess()} returns {@code false}
       * and so the completion failed.
       */
      public final Throwable cause() {
          return cause;
      }
  
      @Override
      public  String toString() {
          final Throwable cause = cause();
          return cause == null? getClass().getSimpleName() + "(SUCCESS)" :
                  getClass().getSimpleName() +  '(' + cause + ')';
      }
  }