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   /*
    * Copyright 2012 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;
  
  import java.net.SocketAddress;
  
  /**
   * A skeletal server-side {@link Channel} implementation.  A server-side
   * {@link Channel} does not allow the following operations:
   * <ul>
   * <li>{@link #connect(SocketAddress, ChannelPromise)}</li>
   * <li>{@link #disconnect(ChannelPromise)}</li>
   * <li>{@link #write(Object, ChannelPromise)}</li>
   * <li>{@link #flush()}</li>
   * <li>and the shortcut methods which calls the methods mentioned above
   * </ul>
   */
  public abstract class AbstractServerChannel extends AbstractChannel implements ServerChannel {
      private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
  
      /**
       * Creates a new instance.
       */
      protected AbstractServerChannel() {
          super(null);
      }
  
      @Override
      public ChannelMetadata metadata() {
          return METADATA;
      }
  
      @Override
      public SocketAddress remoteAddress() {
          return null;
      }
  
      @Override
      protected SocketAddress remoteAddress0() {
          return null;
      }
  
      @Override
      protected void doDisconnect() throws Exception {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected AbstractUnsafe newUnsafe() {
          return new DefaultServerUnsafe();
      }
  
      @Override
      protected void doWrite(ChannelOutboundBuffer in) throws Exception {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected final Object filterOutboundMessage(Object msg) {
          throw new UnsupportedOperationException();
      }
  
      private final class DefaultServerUnsafe extends AbstractUnsafe {
          @Override
          public void connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
              safeSetFailure(promise, new UnsupportedOperationException());
          }
      }
  }