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   /*
    * Copyright 2014 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 java.util.Collections;
  import java.util.List;
  
  import javax.net.ssl.SSLEngine;
  
  /**
   * The {@link JdkApplicationProtocolNegotiator} to use if you do not care about NPN or ALPN and are using
   * {@link SslProvider#JDK}.
   */
  final class JdkDefaultApplicationProtocolNegotiator implements JdkApplicationProtocolNegotiator {
      public static final JdkDefaultApplicationProtocolNegotiator INSTANCE =
              new JdkDefaultApplicationProtocolNegotiator();
      private static final SslEngineWrapperFactory DEFAULT_SSL_ENGINE_WRAPPER_FACTORY = new SslEngineWrapperFactory() {
          @Override
          public SSLEngine wrapSslEngine(SSLEngine engine,
                                         JdkApplicationProtocolNegotiator applicationNegotiator, boolean isServer) {
              return engine;
          }
      };
  
      private JdkDefaultApplicationProtocolNegotiator() {
      }
  
      @Override
      public SslEngineWrapperFactory wrapperFactory() {
          return DEFAULT_SSL_ENGINE_WRAPPER_FACTORY;
      }
  
      @Override
      public ProtocolSelectorFactory protocolSelectorFactory() {
          throw new UnsupportedOperationException("Application protocol negotiation unsupported");
      }
  
      @Override
      public ProtocolSelectionListenerFactory protocolListenerFactory() {
          throw new UnsupportedOperationException("Application protocol negotiation unsupported");
      }
  
      @Override
      public List<String> protocols() {
          return Collections.emptyList();
      }
  }