* This class does not actually do any work. Instead, it redirects all of
* its calls to a socket implementation object which implements the
* SocketImpl interface. The implementation class is
* instantiated by factory class that implements the
* SocketImplFactory interface. A default
* factory is provided, however the factory may be set by a call to
* the setSocketImplFactory method. Note that this may only be
* done once per virtual machine. If a subsequent attempt is made to set the
* factory, a SocketException will be thrown.
*
* @author Aaron M. Renn (arenn@urbanophile.com)
* @author Per Bothner (bothner@cygnus.com)
*/
public class Socket
{
/**
* This is the user SocketImplFactory for this class. If this variable is
* null, a default factory is used.
*/
static SocketImplFactory factory;
/**
* The implementation object to which calls are redirected
*/
// package-private because ServerSocket.implAccept() needs to access it.
SocketImpl impl;
/**
* True if impl.create() has been called.
*/
// package-private because ServerSocket.implAccept() needs to access it.
boolean implCreated;
/**
* True if the socket is bound.
* Package private so it can be set from ServerSocket when accept is called.
*/
boolean bound;
/**
* True if input is shutdown.
*/
private boolean inputShutdown;
/**
* True if output is shutdown.
*/
private boolean outputShutdown;
/**
* Initializes a new instance of Socket object without
* connecting to a remote host. This useful for subclasses of socket that
* might want this behavior.
*
* @specnote This constructor is public since JDK 1.4
* @since 1.1
*/
public Socket()
{
if (factory != null)
impl = factory.createSocketImpl();
else
impl = new PlainSocketImpl();
}
/**
* Initializes a new instance of Socket object without
* connecting to a remote host. This is useful for subclasses of socket
* that might want this behavior.
*
* Additionally, this socket will be created using the supplied
* implementation class instead the default class or one returned by a
* factory. If this value is null, the default Socket
* implementation is used.
*
* @param impl The SocketImpl to use for this
* Socket
*
* @exception SocketException If an error occurs
*
* @since 1.1
*/
protected Socket(SocketImpl impl) throws SocketException
{
if (impl == null)
this.impl = new PlainSocketImpl();
else
this.impl = impl;
}
/**
* Initializes a new instance of Socket and connects to the
* hostname and port specified as arguments.
*
* @param host The name of the host to connect to
* @param port The port number to connect to
*
* @exception UnknownHostException If the hostname cannot be resolved to a
* network address.
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*/
public Socket(String host, int port)
throws UnknownHostException, IOException
{
this(InetAddress.getByName(host), port, null, 0, true);
}
/**
* Initializes a new instance of Socket and connects to the
* address and port number specified as arguments.
*
* @param address The address to connect to
* @param port The port number to connect to
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*/
public Socket(InetAddress address, int port) throws IOException
{
this(address, port, null, 0, true);
}
/**
* Initializes a new instance of Socket that connects to the
* named host on the specified port and binds to the specified local address
* and port.
*
* @param host The name of the remote host to connect to.
* @param port The remote port to connect to.
* @param localAddr The local address to bind to.
* @param localPort The local port to bind to.
*
* @exception SecurityException If the SecurityManager
* exists and does not allow a connection to the specified host/port or
* binding to the specified local host/port.
* @exception IOException If a connection error occurs.
*
* @since 1.1
*/
public Socket(String host, int port, InetAddress localAddr, int localPort)
throws IOException
{
this(InetAddress.getByName(host), port, localAddr, localPort, true);
}
/**
* Initializes a new instance of Socket and connects to the
* address and port number specified as arguments, plus binds to the
* specified local address and port.
*
* @param address The remote address to connect to
* @param port The remote port to connect to
* @param localAddr The local address to connect to
* @param localPort The local port to connect to
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*
* @since 1.1
*/
public Socket(InetAddress address, int port, InetAddress localAddr,
int localPort) throws IOException
{
this(address, port, localAddr, localPort, true);
}
/**
* Initializes a new instance of Socket and connects to the
* hostname and port specified as arguments. If the stream argument is set
* to true, then a stream socket is created. If it is
* false, a datagram socket is created.
*
* @param host The name of the host to connect to
* @param port The port to connect to
* @param stream true for a stream socket, false
* for a datagram socket
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*
* @deprecated Use the DatagramSocket class to create
* datagram oriented sockets.
*/
public Socket(String host, int port, boolean stream)
throws IOException
{
this(InetAddress.getByName(host), port, null, 0, stream);
}
/**
* Initializes a new instance of Socket and connects to the
* address and port number specified as arguments. If the stream param is
* true, a stream socket will be created, otherwise a datagram
* socket is created.
*
* @param host The address to connect to
* @param port The port number to connect to
* @param stream true to create a stream socket,
* false to create a datagram socket.
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*
* @deprecated Use the DatagramSocket class to create
* datagram oriented sockets.
*/
public Socket(InetAddress host, int port, boolean stream)
throws IOException
{
this(host, port, null, 0, stream);
}
/**
* This constructor is where the real work takes place. Connect to the
* specified address and port. Use default local values if not specified,
* otherwise use the local host and port passed in. Create as stream or
* datagram based on "stream" argument.
*
*
* @param raddr The remote address to connect to
* @param rport The remote port to connect to
* @param laddr The local address to connect to
* @param lport The local port to connect to
* @param stream true for a stream socket, false for a datagram socket
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
*/
private Socket(InetAddress raddr, int rport, InetAddress laddr, int lport,
boolean stream) throws IOException
{
this();
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkConnect(raddr.getHostAddress(), rport);
// bind socket
SocketAddress bindaddr =
laddr == null ? null : new InetSocketAddress(laddr, lport);
bind(bindaddr);
// Connect socket in case of Exceptions we must close the socket
// because an exception in the constructor means that the caller will
// not have a reference to this instance.
// Note: You may have the idea that the exception treatment
// should be moved into connect() but there is a Mauve test which
// shows that a failed connect should not close the socket.
try
{
connect(new InetSocketAddress(raddr, rport));
}
catch (IOException ioe)
{
impl.close();
throw ioe;
}
catch (RuntimeException re)
{
impl.close();
throw re;
}
// FIXME: JCL p. 1586 says if localPort is unspecified, bind to any port,
// i.e. '0' and if localAddr is unspecified, use getLocalAddress() as
// that default. JDK 1.2 doc infers not to do a bind.
}
private SocketImpl getImpl() throws SocketException
{
if (! implCreated)
{
try
{
impl.create(true);
}
catch (IOException x)
{
throw (SocketException) new SocketException().initCause(x);
}
implCreated = true;
}
return impl;
}
/**
* Binds the socket to the given local address/port
*
* @param bindpoint The address/port to bind to
*
* @exception IOException If an error occurs
* @exception SecurityException If a security manager exists and its
* checkConnect method doesn't allow the operation
* @exception IllegalArgumentException If the address type is not supported
*
* @since 1.4
*/
public void bind(SocketAddress bindpoint) throws IOException
{
if (isClosed())
throw new SocketException("socket is closed");
// XXX: JDK 1.4.1 API documentation says that if bindpoint is null the
// socket will be bound to an ephemeral port and a valid local address.
if (bindpoint == null)
bindpoint = new InetSocketAddress(InetAddress.ANY_IF, 0);
if (! (bindpoint instanceof InetSocketAddress))
throw new IllegalArgumentException();
InetSocketAddress tmp = (InetSocketAddress) bindpoint;
// bind to address/port
try
{
getImpl().bind(tmp.getAddress(), tmp.getPort());
bound = true;
}
catch (IOException exception)
{
close();
throw exception;
}
catch (RuntimeException exception)
{
close();
throw exception;
}
catch (Error error)
{
close();
throw error;
}
}
/**
* Connects the socket with a remote address.
*
* @param endpoint The address to connect to
*
* @exception IOException If an error occurs
* @exception IllegalArgumentException If the addess type is not supported
* @exception IllegalBlockingModeException If this socket has an associated
* channel, and the channel is in non-blocking mode
*
* @since 1.4
*/
public void connect(SocketAddress endpoint) throws IOException
{
connect(endpoint, 0);
}
/**
* Connects the socket with a remote address. A timeout of zero is
* interpreted as an infinite timeout. The connection will then block
* until established or an error occurs.
*
* @param endpoint The address to connect to
* @param timeout The length of the timeout in milliseconds, or
* 0 to indicate no timeout.
*
* @exception IOException If an error occurs
* @exception IllegalArgumentException If the address type is not supported
* @exception IllegalBlockingModeException If this socket has an associated
* channel, and the channel is in non-blocking mode
* @exception SocketTimeoutException If the timeout is reached
*
* @since 1.4
*/
public void connect(SocketAddress endpoint, int timeout)
throws IOException
{
if (isClosed())
throw new SocketException("socket is closed");
if (! (endpoint instanceof InetSocketAddress))
throw new IllegalArgumentException("unsupported address type");
// The Sun spec says that if we have an associated channel and
// it is in non-blocking mode, we throw an IllegalBlockingModeException.
// However, in our implementation if the channel itself initiated this
// operation, then we must honor it regardless of its blocking mode.
if (getChannel() != null && ! getChannel().isBlocking()
&& ! ((PlainSocketImpl) getImpl()).isInChannelOperation())
throw new IllegalBlockingModeException();
if (! isBound())
bind(null);
getImpl().connect(endpoint, timeout);
}
/**
* Returns the address of the remote end of the socket. If this socket
* is not connected, then null is returned.
*
* @return The remote address this socket is connected to
*/
public InetAddress getInetAddress()
{
if (! isConnected())
return null;
try
{
return getImpl().getInetAddress();
}
catch (SocketException e)
{
// This cannot happen as we are connected.
}
return null;
}
/**
* Returns the local address to which this socket is bound. If this socket
* is not connected, then a wildcard address, for which
* @see InetAddress#isAnyLocalAddress() is true, is returned.
*
* @return The local address
*
* @since 1.1
*/
public InetAddress getLocalAddress()
{
if (! isBound())
return InetAddress.ANY_IF;
InetAddress addr = null;
if (impl instanceof PlainSocketImpl)
addr = ((PlainSocketImpl) impl).getLocalAddress().getAddress();
if (addr == null)
{
try
{
addr = (InetAddress) getImpl().getOption(SocketOptions.SO_BINDADDR);
}
catch (SocketException e)
{
// (hopefully) shouldn't happen
// throw new java.lang.InternalError
// ("Error in PlainSocketImpl.getOption");
return null;
}
}
// FIXME: According to libgcj, checkConnect() is supposed to be called
// before performing this operation. Problems: 1) We don't have the
// addr until after we do it, so we do a post check. 2). The docs I
// see don't require this in the Socket case, only DatagramSocket, but
// we'll assume they mean both.
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkConnect(addr.getHostName(), getLocalPort());
return addr;
}
/**
* Returns the port number of the remote end of the socket connection. If
* this socket is not connected, then 0 is returned.
*
* @return The remote port this socket is connected to
*/
public int getPort()
{
if (! isConnected())
return 0;
try
{
return getImpl().getPort();
}
catch (SocketException e)
{
// This cannot happen as we are connected.
}
return 0;
}
/**
* Returns the local port number to which this socket is bound. If this
* socket is not connected, then -1 is returned.
*
* @return The local port
*/
public int getLocalPort()
{
if (! isBound())
return -1;
try
{
if (getImpl() != null)
return getImpl().getLocalPort();
}
catch (SocketException e)
{
// This cannot happen as we are bound.
}
return -1;
}
/**
* Returns local socket address.
*
* @return the local socket address, null if not bound
*
* @since 1.4
*/
public SocketAddress getLocalSocketAddress()
{
if (! isBound())
return null;
InetAddress addr = getLocalAddress();
try
{
return new InetSocketAddress(addr, getImpl().getLocalPort());
}
catch (SocketException e)
{
// This cannot happen as we are bound.
return null;
}
}
/**
* Returns the remote socket address.
*
* @return the remote socket address, null of not connected
*
* @since 1.4
*/
public SocketAddress getRemoteSocketAddress()
{
if (! isConnected())
return null;
try
{
return new InetSocketAddress(getImpl().getInetAddress(),
getImpl().getPort());
}
catch (SocketException e)
{
// This cannot happen as we are connected.
return null;
}
}
/**
* Returns an InputStream for reading from this socket.
*
* @return The InputStream object
*
* @exception IOException If an error occurs or Socket is not connected
*/
public InputStream getInputStream() throws IOException
{
if (isClosed())
throw new SocketException("socket is closed");
if (! isConnected())
throw new IOException("not connected");
return getImpl().getInputStream();
}
/**
* Returns an OutputStream for writing to this socket.
*
* @return The OutputStream object
*
* @exception IOException If an error occurs or Socket is not connected
*/
public OutputStream getOutputStream() throws IOException
{
if (isClosed())
throw new SocketException("socket is closed");
if (! isConnected())
throw new IOException("not connected");
return getImpl().getOutputStream();
}
/**
* Sets the TCP_NODELAY option on the socket.
*
* @param on true to enable, false to disable
*
* @exception SocketException If an error occurs or Socket is not connected
*
* @since 1.1
*/
public void setTcpNoDelay(boolean on) throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
getImpl().setOption(SocketOptions.TCP_NODELAY, Boolean.valueOf(on));
}
/**
* Tests whether or not the TCP_NODELAY option is set on the socket.
* Returns true if enabled, false if disabled. When on it disables the
* Nagle algorithm which means that packets are always send immediatly and
* never merged together to reduce network trafic.
*
* @return Whether or not TCP_NODELAY is set
*
* @exception SocketException If an error occurs or Socket not connected
*
* @since 1.1
*/
public boolean getTcpNoDelay() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object on = getImpl().getOption(SocketOptions.TCP_NODELAY);
if (on instanceof Boolean)
return (((Boolean) on).booleanValue());
else
throw new SocketException("Internal Error");
}
/**
* Sets the value of the SO_LINGER option on the socket. If the
* SO_LINGER option is set on a socket and there is still data waiting to
* be sent when the socket is closed, then the close operation will block
* until either that data is delivered or until the timeout period
* expires. The linger interval is specified in hundreths of a second
* (platform specific?)
*
* @param on true to enable SO_LINGER, false to disable
* @param linger The SO_LINGER timeout in hundreths of a second or -1 if
* SO_LINGER not set.
*
* @exception SocketException If an error occurs or Socket not connected
* @exception IllegalArgumentException If linger is negative
*
* @since 1.1
*/
public void setSoLinger(boolean on, int linger) throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
if (on)
{
if (linger < 0)
throw new IllegalArgumentException("SO_LINGER must be >= 0");
if (linger > 65535)
linger = 65535;
getImpl().setOption(SocketOptions.SO_LINGER, Integer.valueOf(linger));
}
else
getImpl().setOption(SocketOptions.SO_LINGER, Integer.valueOf(-1));
}
/**
* Returns the value of the SO_LINGER option on the socket. If the
* SO_LINGER option is set on a socket and there is still data waiting to
* be sent when the socket is closed, then the close operation will block
* until either that data is delivered or until the timeout period
* expires. This method either returns the timeouts (in hundredths of
* of a second (platform specific?)) if SO_LINGER is set, or -1 if
* SO_LINGER is not set.
*
* @return The SO_LINGER timeout in hundreths of a second or -1
* if SO_LINGER not set
*
* @exception SocketException If an error occurs or Socket is not connected
*
* @since 1.1
*/
public int getSoLinger() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object linger = getImpl().getOption(SocketOptions.SO_LINGER);
if (linger instanceof Integer)
return (((Integer) linger).intValue());
else
return -1;
}
/**
* Sends urgent data through the socket
*
* @param data The data to send.
* Only the lowest eight bits of data are sent
*
* @exception IOException If an error occurs
*
* @since 1.4
*/
public void sendUrgentData(int data) throws IOException
{
if (isClosed())
throw new SocketException("socket is closed");
getImpl().sendUrgentData(data);
}
/**
* Enables/disables the SO_OOBINLINE option
*
* @param on True if SO_OOBLINE should be enabled
*
* @exception SocketException If an error occurs
*
* @since 1.4
*/
public void setOOBInline(boolean on) throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
getImpl().setOption(SocketOptions.SO_OOBINLINE, Boolean.valueOf(on));
}
/**
* Returns the current setting of the SO_OOBINLINE option for this socket
*
* @return True if SO_OOBINLINE is set, false otherwise.
*
* @exception SocketException If an error occurs
*
* @since 1.4
*/
public boolean getOOBInline() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object buf = getImpl().getOption(SocketOptions.SO_OOBINLINE);
if (buf instanceof Boolean)
return (((Boolean) buf).booleanValue());
else
throw new SocketException("Internal Error: Unexpected type");
}
/**
* Sets the value of the SO_TIMEOUT option on the socket. If this value
* is set, and an read/write is performed that does not complete within
* the timeout period, a short count is returned (or an EWOULDBLOCK signal
* would be sent in Unix if no data had been read). A value of 0 for
* this option implies that there is no timeout (ie, operations will
* block forever). On systems that have separate read and write timeout
* values, this method returns the read timeout. This
* value is in milliseconds.
*
* @param timeout The length of the timeout in milliseconds, or
* 0 to indicate no timeout.
*
* @exception SocketException If an error occurs or Socket not connected
*
* @since 1.1
*/
public synchronized void setSoTimeout(int timeout) throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
if (timeout < 0)
throw new IllegalArgumentException("SO_TIMEOUT value must be >= 0");
getImpl().setOption(SocketOptions.SO_TIMEOUT, Integer.valueOf(timeout));
}
/**
* Returns the value of the SO_TIMEOUT option on the socket. If this value
* is set, and an read/write is performed that does not complete within
* the timeout period, a short count is returned (or an EWOULDBLOCK signal
* would be sent in Unix if no data had been read). A value of 0 for
* this option implies that there is no timeout (ie, operations will
* block forever). On systems that have separate read and write timeout
* values, this method returns the read timeout. This
* value is in thousandths of a second (implementation specific?).
*
* @return The length of the timeout in thousandth's of a second or 0
* if not set
*
* @exception SocketException If an error occurs or Socket not connected
*
* @since 1.1
*/
public synchronized int getSoTimeout() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object timeout = getImpl().getOption(SocketOptions.SO_TIMEOUT);
if (timeout instanceof Integer)
return (((Integer) timeout).intValue());
else
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 (isClosed())
throw new SocketException("socket is closed");
if (size <= 0)
throw new IllegalArgumentException("SO_SNDBUF value must be > 0");
getImpl().setOption(SocketOptions.SO_SNDBUF, Integer.valueOf(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 (isClosed())
throw new SocketException("socket is closed");
Object buf = getImpl().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 (isClosed())
throw new SocketException("socket is closed");
if (size <= 0)
throw new IllegalArgumentException("SO_RCVBUF value must be > 0");
getImpl().setOption(SocketOptions.SO_RCVBUF, Integer.valueOf(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 (isClosed())
throw new SocketException("socket is closed");
Object buf = getImpl().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 (isClosed())
throw new SocketException("socket is closed");
getImpl().setOption(SocketOptions.SO_KEEPALIVE, Boolean.valueOf(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 (isClosed())
throw new SocketException("socket is closed");
Object buf = getImpl().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 (isClosed())
return;
impl.close();
impl = null;
}
/**
* Converts this Socket to a String.
*
* @return The String representation of this Socket
*/
public String toString()
{
try
{
if (isConnected())
return (super.toString()
+ " [addr=" + getImpl().getInetAddress() + ",port="
+ getImpl().getPort() + ",localport="
+ getImpl().getLocalPort() + "]");
}
catch (SocketException e)
{
// This cannot happen as we are connected.
}
return super.toString() + " [unconnected]";
}
/**
* Sets the SocketImplFactory. This may be done only once per
* virtual machine. Subsequent attempts will generate a
* SocketException. Note that a SecurityManager
* check is made prior to setting the factory. If
* insufficient privileges exist to set the factory, then an
* IOException will be thrown.
*
* @param fac the factory to set
*
* @exception SecurityException If the SecurityManager 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 (isClosed())
throw new SocketException("socket is closed");
getImpl().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 (isClosed())
throw new SocketException("socket is closed");
getImpl().shutdownOutput();
outputShutdown = true;
}
/**
* Returns the socket channel associated with this socket.
*
* @return the associated socket channel,
* null if no associated channel exists
*
* @since 1.4
*/
public SocketChannel getChannel()
{
return null;
}
/**
* Checks if the SO_REUSEADDR option is enabled
*
* @return True if SO_REUSEADDR is set, false otherwise.
*
* @exception SocketException If an error occurs
*
* @since 1.4
*/
public boolean getReuseAddress() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object reuseaddr = getImpl().getOption(SocketOptions.SO_REUSEADDR);
if (! (reuseaddr instanceof Boolean))
throw new SocketException("Internal Error");
return ((Boolean) reuseaddr).booleanValue();
}
/**
* Enables/Disables the SO_REUSEADDR option
*
* @param reuseAddress true if SO_REUSEADDR should be enabled,
* false otherwise
*
* @exception SocketException If an error occurs
*
* @since 1.4
*/
public void setReuseAddress(boolean reuseAddress) throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
getImpl().setOption(SocketOptions.SO_REUSEADDR,
Boolean.valueOf(reuseAddress));
}
/**
* Returns the current traffic class
*
* @return The current traffic class.
*
* @exception SocketException If an error occurs
*
* @see Socket#setTrafficClass(int tc)
*
* @since 1.4
*/
public int getTrafficClass() throws SocketException
{
if (isClosed())
throw new SocketException("socket is closed");
Object obj = getImpl().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 (isClosed())
throw new SocketException("socket is closed");
if (tc < 0 || tc > 255)
throw new IllegalArgumentException();
getImpl().setOption(SocketOptions.IP_TOS, Integer.valueOf(tc));
}
/**
* Checks if the socket is connected
*
* @return True if socket is connected, false otherwise.
*
* @since 1.4
*/
public boolean isConnected()
{
if (impl == null)
return false;
return impl.getInetAddress() != null;
}
/**
* Checks if the socket is already bound.
*
* @return True if socket is bound, false otherwise.
*
* @since 1.4
*/
public boolean isBound()
{
if (isClosed())
return false;
if (impl instanceof PlainSocketImpl)
{
InetSocketAddress addr = ((PlainSocketImpl) impl).getLocalAddress();
return addr != null && addr.getAddress() != null;
}
return bound;
}
/**
* Checks if the socket is closed.
*
* @return True if socket is closed, false otherwise.
*
* @since 1.4
*/
public boolean isClosed()
{
SocketChannel channel = getChannel();
return impl == null || (channel != null && ! channel.isOpen());
}
/**
* Checks if the socket's input stream is shutdown
*
* @return True if input is shut down.
*
* @since 1.4
*/
public boolean isInputShutdown()
{
return inputShutdown;
}
/**
* Checks if the socket's output stream is shutdown
*
* @return True if output is shut down.
*
* @since 1.4
*/
public boolean isOutputShutdown()
{
return outputShutdown;
}
}