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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:
    *
    *   http://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 org.jboss.netty.channel.socket.nio;
  
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelFactory;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.channel.ChannelSink;
  
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.nio.channels.SocketChannel;
  
  public class NioSocketChannel extends AbstractNioChannel<SocketChannel>
                                  implements org.jboss.netty.channel.socket.SocketChannel {
  
      private static final int ST_OPEN = 0;
      private static final int ST_BOUND = 1;
      private static final int ST_CONNECTED = 2;
      private static final int ST_CLOSED = -1;
      @SuppressWarnings("RedundantFieldInitialization")
      volatile int state = ST_OPEN;
  
      private final NioSocketChannelConfig config;
  
      public NioSocketChannel(
              Channel parent, ChannelFactory factory,
              ChannelPipeline pipeline, ChannelSink sink,
              SocketChannel socket, NioWorker worker) {
          super(parent, factory, pipeline, sink, worker, socket);
          config = new DefaultNioSocketChannelConfig(socket.socket());
      }
  
      @Override
      public NioWorker getWorker() {
          return (NioWorker) super.getWorker();
      }
  
      @Override
      public NioSocketChannelConfig getConfig() {
          return config;
      }
  
      @Override
      public boolean isOpen() {
          return state >= ST_OPEN;
      }
  
      public boolean isBound() {
          return state >= ST_BOUND;
      }
  
      public boolean isConnected() {
          return state == ST_CONNECTED;
      }
  
      final void setBound() {
          assert state == ST_OPEN : "Invalid state: " + state;
          state = ST_BOUND;
      }
  
      final void setConnected() {
          if (state != ST_CLOSED) {
              state = ST_CONNECTED;
          }
      }
  
      @Override
      protected boolean setClosed() {
          if (super.setClosed()) {
              state = ST_CLOSED;
              return true;
          }
          return false;
      }
  
      @Override
      InetSocketAddress getLocalSocketAddress() throws Exception {
          return (InetSocketAddress) channel.socket().getLocalSocketAddress();
      }
  
      @Override
      InetSocketAddress getRemoteSocketAddress() throws Exception {
          return (InetSocketAddress) channel.socket().getRemoteSocketAddress();
      }
 
     @Override
     public ChannelFuture write(Object message, SocketAddress remoteAddress) {
         if (remoteAddress == null || remoteAddress.equals(getRemoteAddress())) {
             return super.write(message, null);
         } else {
             return getUnsupportedOperationFuture();
         }
     }
 }