socket.java

俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）的全部源代码。

      return 0;
  }

  /**
   * This method sets the value for the system level socket option
   * SO_SNDBUF to the specified value.  Note that valid values for this
   * option are specific to a given operating system.
   *
   * @param size The new send buffer size.
   *
   * @exception SocketException If an error occurs or Socket not connected
   * @exception IllegalArgumentException If size is 0 or negative
   *
   * @since 1.2
   */
  public void setSendBufferSize (int size) throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");
    
    if (size <= 0)
      throw new IllegalArgumentException("SO_SNDBUF value must be > 0");
    
    impl.setOption(SocketOptions.SO_SNDBUF, new Integer(size));
  }

  /**
   * This method returns the value of the system level socket option
   * SO_SNDBUF, which is used by the operating system to tune buffer
   * sizes for data transfers.
   *
   * @return The send buffer size.
   *
   * @exception SocketException If an error occurs or socket not connected
   *
   * @since 1.2
   */
  public int getSendBufferSize () throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");

    Object buf = impl.getOption(SocketOptions.SO_SNDBUF);

    if (buf instanceof Integer)
      return(((Integer)buf).intValue());
    else
      throw new SocketException("Internal Error: Unexpected type");
  }

  /**
   * This method sets the value for the system level socket option
   * SO_RCVBUF to the specified value.  Note that valid values for this
   * option are specific to a given operating system.
   *
   * @param size The new receive buffer size.
   *
   * @exception SocketException If an error occurs or Socket is not connected
   * @exception IllegalArgumentException If size is 0 or negative
   *
   * @since 1.2
   */
  public void setReceiveBufferSize (int size) throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");

    if (size <= 0)
      throw new IllegalArgumentException("SO_RCVBUF value must be > 0");
      
    impl.setOption(SocketOptions.SO_RCVBUF, new Integer(size));
  }

  /**
   * This method returns the value of the system level socket option
   * SO_RCVBUF, which is used by the operating system to tune buffer
   * sizes for data transfers.
   *
   * @return The receive buffer size.
   *
   * @exception SocketException If an error occurs or Socket is not connected
   *
   * @since 1.2
   */
  public int getReceiveBufferSize () throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");

    Object buf = impl.getOption(SocketOptions.SO_RCVBUF);

    if (buf instanceof Integer)
      return(((Integer)buf).intValue());
    else
      throw new SocketException("Internal Error: Unexpected type");
  }

  /**
   * This method sets the value for the socket level socket option
   * SO_KEEPALIVE.
   *
   * @param on True if SO_KEEPALIVE should be enabled
   *
   * @exception SocketException If an error occurs or Socket is not connected
   *
   * @since 1.3
   */
  public void setKeepAlive (boolean on) throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");

    impl.setOption(SocketOptions.SO_KEEPALIVE, new Boolean(on));
  }

  /**
   * This method returns the value of the socket level socket option
   * SO_KEEPALIVE.
   *
   * @return The setting
   *
   * @exception SocketException If an error occurs or Socket is not connected
   *
   * @since 1.3
   */
  public boolean getKeepAlive () throws SocketException
  {
    if (impl == null)
      throw new SocketException("Not connected");

    Object buf = impl.getOption(SocketOptions.SO_KEEPALIVE);

    if (buf instanceof Boolean)
      return(((Boolean)buf).booleanValue());
    else
      throw new SocketException("Internal Error: Unexpected type");
  }

  /**
   * Closes the socket.
   *
   * @exception IOException If an error occurs
   */
  public synchronized void close ()  throws IOException
  {
    if (impl != null)
      impl.close();

    if (ch != null)
      ch.close();
    
    closed = true;
  }

  /**
   * Converts this <code>Socket</code> to a <code>String</code>.
   *
   * @return The <code>String</code> representation of this <code>Socket</code>
   */
  public String toString ()
  {
    return("Socket " + impl);
  }

  // Class Methods

  /**
   * Sets the <code>SocketImplFactory</code>.  This may be done only once per 
   * virtual machine.  Subsequent attempts will generate a 
   * <code>SocketException</code>.  Note that a <code>SecurityManager</code>
   * check is made prior to setting the factory.  If 
   * insufficient privileges exist to set the factory, then an 
   * <code>IOException</code> will be thrown.
   *
   * @exception SecurityException If the <code>SecurityManager</code> does
   * not allow this operation.
   * @exception SocketException If the SocketImplFactory is already defined
   * @exception IOException If any other error occurs
   */
  public static synchronized void setSocketImplFactory (SocketImplFactory fac)
    throws IOException
  {
    // See if already set
    if (factory != null)
      throw new SocketException("SocketImplFactory already defined");

    // Check permissions
    SecurityManager sm = System.getSecurityManager();
    if (sm != null)
      sm.checkSetFactory();

    if (fac == null)
      throw new SocketException("SocketImplFactory cannot be null");

    factory = fac;
  }

  /**
   * Closes the input side of the socket stream.
   *
   * @exception IOException If an error occurs.
   *
   * @since 1.3
   */
  public void shutdownInput() throws IOException
  {
    if (impl != null)
      impl.shutdownInput();

    inputShutdown = true;
  }

  /**
   * Closes the output side of the socket stream.
   *
   * @exception IOException If an error occurs.
   *
   * @since 1.3
   */
  public void shutdownOutput() throws IOException
  {
    if (impl != null)
      impl.shutdownOutput();
    
    outputShutdown = true;
  }

  /**
   * Returns the socket channel associated with this socket.
   *
   * It returns null if no associated socket exists.
   *
   * @since 1.4
   */
  public SocketChannel getChannel()
  {
    return ch;
  }

  /**
   * Checks if the SO_REUSEADDR option is enabled
   *
   * @exception SocketException If an error occurs
   *
   * @since 1.4
   */
  public boolean getReuseAddress () throws SocketException
  {
    if (impl == null)
      throw new SocketException ("Cannot initialize Socket implementation");

    Object reuseaddr = impl.getOption (SocketOptions.SO_REUSEADDR);

    if (!(reuseaddr instanceof Boolean))
      throw new SocketException ("Internal Error");

    return ((Boolean) reuseaddr).booleanValue ();
  }

  /**
   * Enables/Disables the SO_REUSEADDR option
   *
   * @exception SocketException If an error occurs
   *
   * @since 1.4
   */
  public void setReuseAddress (boolean on) throws SocketException
  {
    if (impl == null)
      throw new SocketException ("Cannot initialize Socket implementation");

    impl.setOption (SocketOptions.SO_REUSEADDR, new Boolean (on));
  }

  /**
   * Returns the current traffic class
   *
   * @exception SocketException If an error occurs
   *
   * @see Socket:setTrafficClass
   *
   * @since 1.4
   */
  public int getTrafficClass () throws SocketException
  {
    if (impl == null)
      throw new SocketException ("Cannot initialize Socket implementation");

    Object obj = impl.getOption(SocketOptions.IP_TOS);

    if (obj instanceof Integer)
      return ((Integer) obj).intValue ();
    else
      throw new SocketException ("Unexpected type");
  }

  /**
   * Sets the traffic class value
   *
   * @param tc The traffic class
   *
   * @exception SocketException If an error occurs
   * @exception IllegalArgumentException If tc value is illegal
   *
   * @see Socket:getTrafficClass
   *
   * @since 1.4
   */
  public void setTrafficClass (int tc) throws SocketException
  {
    if (impl == null)
      throw new SocketException ("Cannot initialize Socket implementation");

    if (tc < 0 || tc > 255)
      throw new IllegalArgumentException();

    impl.setOption (SocketOptions.IP_TOS, new Integer (tc));
  }

  /**
   * Checks if the socket is connected
   *
   * @since 1.4
   */
  public boolean isConnected ()
  {
    return impl.getInetAddress () != null;
  }

  /**
   * Checks if the socket is already bound.
   *
   * @since 1.4
   */
  public boolean isBound ()
  {
    return getLocalAddress () != null;
  }

  /**
   * Checks if the socket is closed.
   * 
   * @since 1.4
   */
  public boolean isClosed ()
  {
    return closed;
  }

  /**
   * Checks if the socket's input stream is shutdown
   *
   * @since 1.4
   */
  public boolean isInputShutdown ()
  {
    return inputShutdown;
  }

  /**
   * Checks if the socket's output stream is shutdown
   *
   * @since 1.4
   */
  public boolean isOutputShutdown ()
  {
    return outputShutdown;
  }
}