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   /*
    * Copyright 2011 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.channel.sctp;
  
  import com.sun.nio.sctp.AbstractNotificationHandler;
  import com.sun.nio.sctp.AssociationChangeNotification;
  import com.sun.nio.sctp.HandlerResult;
  import com.sun.nio.sctp.Notification;
  import com.sun.nio.sctp.PeerAddressChangeNotification;
  import com.sun.nio.sctp.SendFailedNotification;
  import com.sun.nio.sctp.ShutdownNotification;
  import io.netty.channel.ChannelPipeline;
  import io.netty.util.internal.ObjectUtil;
  
  
  /**
   * {@link AbstractNotificationHandler} implementation which will handle all {@link Notification}s by trigger a
   * {@link Notification} user event in the {@link ChannelPipeline} of a {@link SctpChannel}.
   */
  public final class SctpNotificationHandler extends AbstractNotificationHandler<Object> {
  
      private final SctpChannel sctpChannel;
  
      public SctpNotificationHandler(SctpChannel sctpChannel) {
          this.sctpChannel = ObjectUtil.checkNotNull(sctpChannel, "sctpChannel");
      }
  
      @Override
      public HandlerResult handleNotification(AssociationChangeNotification notification, Object o) {
          fireEvent(notification);
          return HandlerResult.CONTINUE;
      }
  
      @Override
      public HandlerResult handleNotification(PeerAddressChangeNotification notification, Object o) {
          fireEvent(notification);
          return HandlerResult.CONTINUE;
      }
  
      @Override
      public HandlerResult handleNotification(SendFailedNotification notification, Object o) {
          fireEvent(notification);
          return HandlerResult.CONTINUE;
      }
  
      @Override
      public HandlerResult handleNotification(ShutdownNotification notification, Object o) {
          fireEvent(notification);
          sctpChannel.close();
          return HandlerResult.RETURN;
      }
  
      private void fireEvent(Notification notification) {
          sctpChannel.pipeline().fireUserEventTriggered(notification);
      }
  }