/*
    * 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.netty5.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)}</li>
   * <li>{@link #disconnect()}</li>
   * <li>{@link #write(Object)}</li>
   * <li>{@link #flush()}</li>
   * <li>{@link #shutdown(ChannelShutdownDirection)}</li>
   * <li>and the shortcut methods which calls the methods mentioned above
   * </ul>
   */
  public abstract class AbstractServerChannel<P extends Channel, L extends SocketAddress, R extends SocketAddress>
          extends AbstractChannel<P, L, R> implements ServerChannel {
      private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
  
      private final EventLoopGroup childEventLoopGroup;
  
      /**
       * Creates a new instance.
       */
      protected AbstractServerChannel(EventLoop eventLoop, EventLoopGroup childEventLoopGroup,
                                      Class<? extends Channel> childChannelType) {
          this(eventLoop, childEventLoopGroup, METADATA, childChannelType);
      }
  
      protected AbstractServerChannel(EventLoop eventLoop, EventLoopGroup childEventLoopGroup, ChannelMetadata metadata,
                                      Class<? extends Channel> childChannelType) {
          super(null, eventLoop, metadata, new ServerChannelRecvBufferAllocator());
          this.childEventLoopGroup = validateEventLoopGroup(childEventLoopGroup, "childEventLoopGroup", childChannelType);
      }
  
      @Override
      public final EventLoopGroup childEventLoopGroup() {
          return childEventLoopGroup;
      }
  
      @Override
      protected final R remoteAddress0() {
          return null;
      }
  
      @Override
      protected final void doDisconnect() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected final void doShutdown(ChannelShutdownDirection direction) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public final boolean isShutdown(ChannelShutdownDirection direction) {
          return !isActive();
      }
  
      @Override
      protected final void doWrite(ChannelOutboundBuffer in) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected final Object filterOutboundMessage(Object msg) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected boolean doFinishConnect(R requestedRemoteAddress) {
          throw new UnsupportedOperationException();
      }
  }