/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF 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.apache.mina.transport.socket.nio;
  
  import java.net.InetSocketAddress;
  import java.net.Socket;
  import java.net.SocketException;
  import java.nio.channels.SocketChannel;
  
  import org.apache.mina.core.RuntimeIoException;
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.core.file.FileRegion;
  import org.apache.mina.core.filterchain.IoFilter;
  import org.apache.mina.core.filterchain.IoFilterChain;
  import org.apache.mina.core.service.DefaultTransportMetadata;
  import org.apache.mina.core.service.IoProcessor;
  import org.apache.mina.core.service.IoService;
  import org.apache.mina.core.service.TransportMetadata;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.filter.ssl.SslFilter;
  import org.apache.mina.transport.socket.AbstractSocketSessionConfig;
  import org.apache.mina.transport.socket.SocketSessionConfig;
  
  /**
   * An {@link IoSession} for socket transport (TCP/IP).
   *
   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
   */
  class NioSocketSession extends NioSession {
      static final TransportMetadata METADATA = new DefaultTransportMetadata("nio", "socket", false, true,
              InetSocketAddress.class, SocketSessionConfig.class, IoBuffer.class, FileRegion.class);
  
      /**
       * 
       * Creates a new instance of NioSocketSession.
       *
       * @param service the associated IoService 
       * @param processor the associated IoProcessor
       * @param channel the used channel
       */
      public NioSocketSession(IoService service, IoProcessor<NioSession> processor, SocketChannel channel) {
          super(processor, service, channel);
          config = new SessionConfigImpl();
          config.setAll(service.getSessionConfig());
      }
  
      private Socket getSocket() {
          return ((SocketChannel) channel).socket();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public TransportMetadata getTransportMetadata() {
          return METADATA;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public SocketSessionConfig getConfig() {
          return (SocketSessionConfig) config;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      SocketChannel getChannel() {
          return (SocketChannel) channel;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public InetSocketAddress getRemoteAddress() {
          if (channel == null) {
              return null;
          }
 
         Socket socket = getSocket();
 
         if (socket == null) {
             return null;
         }
 
         return (InetSocketAddress) socket.getRemoteSocketAddress();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public InetSocketAddress getLocalAddress() {
         if (channel == null) {
             return null;
         }
 
         Socket socket = getSocket();
 
         if (socket == null) {
             return null;
         }
 
         return (InetSocketAddress) socket.getLocalSocketAddress();
     }
 
     @Override
     public InetSocketAddress getServiceAddress() {
         return (InetSocketAddress) super.getServiceAddress();
     }
 
     /**
      * A private class storing a copy of the IoService configuration when the IoSession
      * is created. That allows the session to have its own configuration setting, over
      * the IoService default one.
      */
     private class SessionConfigImpl extends AbstractSocketSessionConfig {
         /**
          * {@inheritDoc}
          */
         @Override
         public boolean isKeepAlive() {
             try {
                 return getSocket().getKeepAlive();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setKeepAlive(boolean on) {
             try {
                 getSocket().setKeepAlive(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public boolean isOobInline() {
             try {
                 return getSocket().getOOBInline();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setOobInline(boolean on) {
             try {
                 getSocket().setOOBInline(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public boolean isReuseAddress() {
             try {
                 return getSocket().getReuseAddress();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setReuseAddress(boolean on) {
             try {
                 getSocket().setReuseAddress(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public int getSoLinger() {
             try {
                 return getSocket().getSoLinger();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setSoLinger(int linger) {
             try {
                 if (linger < 0) {
                     getSocket().setSoLinger(false, 0);
                 } else {
                     getSocket().setSoLinger(true, linger);
                 }
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public boolean isTcpNoDelay() {
             if (!isConnected()) {
                 return false;
             }
 
             try {
                 return getSocket().getTcpNoDelay();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setTcpNoDelay(boolean on) {
             try {
                 getSocket().setTcpNoDelay(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public int getTrafficClass() {
             try {
                 return getSocket().getTrafficClass();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setTrafficClass(int tc) {
             try {
                 getSocket().setTrafficClass(tc);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public int getSendBufferSize() {
             try {
                 return getSocket().getSendBufferSize();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setSendBufferSize(int size) {
             try {
                 getSocket().setSendBufferSize(size);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public int getReceiveBufferSize() {
             try {
                 return getSocket().getReceiveBufferSize();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         @Override
         public void setReceiveBufferSize(int size) {
             try {
                 getSocket().setReceiveBufferSize(size);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public final boolean isSecured() {
         // If the session does not have a SslFilter, we can return false
         IoFilterChain chain = getFilterChain();
 
         IoFilter sslFilter = chain.get(SslFilter.class);
 
         if (sslFilter != null) {
         // Get the SslHandler from the SslFilter
             return ((SslFilter)sslFilter).isSecured(this);
         } else {
             return false;
         }
     }
 }