/*
    *  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.SelectionKey;
  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.DefaultIoFilterChain;
  import org.apache.mina.core.filterchain.IoFilterChain;
  import org.apache.mina.core.service.DefaultTransportMetadata;
  import org.apache.mina.core.service.IoHandler;
  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.transport.socket.AbstractSocketSessionConfig;
  import org.apache.mina.transport.socket.SocketSessionConfig;
  
  /**
   * An {@link IoSession} for socket transport (TCP/IP).
   *
   * @author The Apache MINA Project (dev@mina.apache.org)
   */
  class NioSocketSession extends NioSession {
  
      static final TransportMetadata METADATA =
              new DefaultTransportMetadata(
                      "nio", "socket", false, true,
                      InetSocketAddress.class,
                      SocketSessionConfig.class,
                      IoBuffer.class, FileRegion.class);
  
      private final IoService service;
  
      private final SocketSessionConfig config = new SessionConfigImpl();
  
      private final IoProcessor<NioSession> processor;
  
      private final IoFilterChain filterChain = new DefaultIoFilterChain(this);
  
      private final SocketChannel ch;
  
      private final IoHandler handler;
  
      private SelectionKey key;
  
      
      /**
       * 
       * Creates a new instance of NioSocketSession.
       *
       * @param service the associated IoService 
       * @param processor the associated IoProcessor
       * @param ch the used channel
       */
      public NioSocketSession(IoService service, IoProcessor<NioSession> processor, SocketChannel ch) {
          this.service = service;
          this.processor = processor;
          this.ch = ch;
          this.handler = service.getHandler();
          this.config.setAll(service.getSessionConfig());
      }
  
      public IoService getService() {
          return service;
      }
  
      public SocketSessionConfig getConfig() {
          return config;
      }
  
      @Override
      public IoProcessor<NioSession> getProcessor() {
          return processor;
      }
  
     public IoFilterChain getFilterChain() {
         return filterChain;
     }
 
     public TransportMetadata getTransportMetadata() {
         return METADATA;
     }
 
     @Override
     SocketChannel getChannel() {
         return ch;
     }
 
     @Override
     SelectionKey getSelectionKey() {
         return key;
     }
 
     @Override
     void setSelectionKey(SelectionKey key) {
         this.key = key;
     }
 
     public IoHandler getHandler() {
         return handler;
     }
 
     /**
      * {@inheritDoc}
      */
     public InetSocketAddress getRemoteAddress() {
         if ( ch == null ) {
             return null;
         }
         
         Socket socket = ch.socket();
         
         if ( socket == null ) {
             return null;
         }
         
         return (InetSocketAddress) socket.getRemoteSocketAddress();
     }
 
     /**
      * {@inheritDoc}
      */
     public InetSocketAddress getLocalAddress() {
         if ( ch == null ) {
             return null;
         }
         
         Socket socket = ch.socket();
         
         if ( socket == null ) {
             return null;
         }
         
         return (InetSocketAddress) socket.getLocalSocketAddress();
     }
 
     @Override
     public InetSocketAddress getServiceAddress() {
         return (InetSocketAddress) super.getServiceAddress();
     }
 
     private class SessionConfigImpl extends AbstractSocketSessionConfig {
         public boolean isKeepAlive() {
             try {
                 return ch.socket().getKeepAlive();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setKeepAlive(boolean on) {
             try {
                 ch.socket().setKeepAlive(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public boolean isOobInline() {
             try {
                 return ch.socket().getOOBInline();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setOobInline(boolean on) {
             try {
                 ch.socket().setOOBInline(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public boolean isReuseAddress() {
             try {
                 return ch.socket().getReuseAddress();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setReuseAddress(boolean on) {
             try {
                 ch.socket().setReuseAddress(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public int getSoLinger() {
             try {
                 return ch.socket().getSoLinger();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setSoLinger(int linger) {
             try {
                 if (linger < 0) {
                     ch.socket().setSoLinger(false, 0);
                 } else {
                     ch.socket().setSoLinger(true, linger);
                 }
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public boolean isTcpNoDelay() {
             if (!isConnected()) {
                 return false;
             }
 
             try {
                 return ch.socket().getTcpNoDelay();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setTcpNoDelay(boolean on) {
             try {
                 ch.socket().setTcpNoDelay(on);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         public int getTrafficClass() {
             try {
                 return ch.socket().getTrafficClass();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         /**
          * {@inheritDoc}
          */
         public void setTrafficClass(int tc) {
             try {
                 ch.socket().setTrafficClass(tc);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public int getSendBufferSize() {
             try {
                 return ch.socket().getSendBufferSize();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setSendBufferSize(int size) {
             try {
                 ch.socket().setSendBufferSize(size);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public int getReceiveBufferSize() {
             try {
                 return ch.socket().getReceiveBufferSize();
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
 
         public void setReceiveBufferSize(int size) {
             try {
                 ch.socket().setReceiveBufferSize(size);
             } catch (SocketException e) {
                 throw new RuntimeIoException(e);
             }
         }
     }
 }