DatagramSocketImpl

java.lang.Object
- java.net.DatagramSocketImpl

All Implemented Interfaces:

SocketOptions
```
public abstract class DatagramSocketImpl
extends Object
implements SocketOptions
```
Abstract datagram and multicast socket implementation base class.

Since:

JDK1.1

Field Summary

Fields

Modifier and Type	Field and Description
`protected java.io.FileDescriptor`	`fd` The file descriptor object.
`protected int`	`localPort` The local port number.

Fields inherited from interface java.net.SocketOptions
IP_MULTICAST_IF, IP_MULTICAST_IF2, IP_MULTICAST_LOOP, IP_TOS, SO_BINDADDR, SO_BROADCAST, SO_KEEPALIVE, SO_LINGER, SO_OOBINLINE, SO_RCVBUF, SO_REUSEADDR, SO_SNDBUF, SO_TIMEOUT, TCP_NODELAY

Constructor Summary

Constructors

Constructor and Description
`DatagramSocketImpl()`

Method Summary

All Methods

Instance Methods

Abstract Methods

Concrete Methods

Deprecated Methods
Modifier and Type	Method and Description
`protected abstract void`	`bind(int lport, InetAddress laddr)` Binds a datagram socket to a local port and address.
`protected abstract void`	`close()` Close the socket.
`protected void`	`connect(InetAddress address, int port)` Connects a datagram socket to a remote destination.
`protected abstract void`	`create()` Creates a datagram socket.
`protected void`	`disconnect()` Disconnects a datagram socket from its remote destination.
`protected java.io.FileDescriptor`	`getFileDescriptor()` Gets the datagram socket file descriptor.
`protected int`	`getLocalPort()` Gets the local port.
`protected abstract int`	`getTimeToLive()` Retrieve the TTL (time-to-live) option.
`protected abstract byte`	`getTTL()` Deprecated. use getTimeToLive instead.
`protected abstract void`	`join(InetAddress inetaddr)` Join the multicast group.
`protected abstract void`	`joinGroup(SocketAddress mcastaddr, NetworkInterface netIf)` Join the multicast group.
`protected abstract void`	`leave(InetAddress inetaddr)` Leave the multicast group.
`protected abstract void`	`leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf)` Leave the multicast group.
`protected abstract int`	`peek(InetAddress i)` Peek at the packet to see who it is from.
`protected abstract int`	`peekData(DatagramPacket p)` Peek at the packet to see who it is from.
`protected abstract void`	`receive(DatagramPacket p)` Receive the datagram packet.
`protected abstract void`	`send(DatagramPacket p)` Sends a datagram packet.
`protected abstract void`	`setTimeToLive(int ttl)` Set the TTL (time-to-live) option.
`protected abstract void`	`setTTL(byte ttl)` Deprecated. use setTimeToLive instead.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.net.SocketOptions
getOption, setOption

- Field Detail
  - localPort
```
protected int localPort
```
    The local port number.
  - fd
```
protected java.io.FileDescriptor fd
```
    The file descriptor object.
- Constructor Detail
  - DatagramSocketImpl
```
public DatagramSocketImpl()
```
- Method Detail
  - create
```
protected abstract void create()
                        throws SocketException
```
    Creates a datagram socket.
    
    Throws:
    
    SocketException - if there is an error in the underlying protocol, such as a TCP error.
  - bind
```
protected abstract void bind(int lport,
                             InetAddress laddr)
                      throws SocketException
```
    Binds a datagram socket to a local port and address.
    
    Parameters:
    
    lport - the local port
    
    laddr - the local address
    
    Throws:
    
    SocketException - if there is an error in the underlying protocol, such as a TCP error.
  - send
```
protected abstract void send(DatagramPacket p)
                      throws IOException
```
    Sends a datagram packet. The packet contains the data and the destination address to send the packet to.
    
    Parameters:
    
    p - the packet to be sent.
    
    Throws:
    
    IOException - if an I/O exception occurs while sending the datagram packet.
    
    PortUnreachableException - may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
  - connect
```
protected void connect(InetAddress address,
                       int port)
                throws SocketException
```
    Connects a datagram socket to a remote destination. This associates the remote address with the local socket so that datagrams may only be sent to this destination and received from this destination. This may be overridden to call a native system connect.
    If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown.
    
    Parameters:
    
    address - the remote InetAddress to connect to
    
    port - the remote port number
    
    Throws:
    
    SocketException - may be thrown if the socket cannot be connected to the remote destination
    
    Since:
    
    1.4
  - disconnect
```
protected void disconnect()
```
    Disconnects a datagram socket from its remote destination.
    
    Since:
    
    1.4
  - peek
```
protected abstract int peek(InetAddress i)
                     throws IOException
```
    Peek at the packet to see who it is from. Updates the specified InetAddress to the address which the packet came from.
    
    Parameters:
    
    i - an InetAddress object
    
    Returns:
    
    the port number which the packet came from.
    
    Throws:
    
    IOException - if an I/O exception occurs
    
    PortUnreachableException - may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
  - peekData
```
protected abstract int peekData(DatagramPacket p)
                         throws IOException
```
    Peek at the packet to see who it is from. The data is copied into the specified DatagramPacket. The data is returned, but not consumed, so that a subsequent peekData/receive operation will see the same data.
    
    Parameters:
    
    p - the Packet Received.
    
    Returns:
    
    the port number which the packet came from.
    
    Throws:
    
    IOException - if an I/O exception occurs
    
    PortUnreachableException - may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
    
    Since:
    
    1.4
  - receive
```
protected abstract void receive(DatagramPacket p)
                         throws IOException
```
    Receive the datagram packet.
    
    Parameters:
    
    p - the Packet Received.
    
    Throws:
    
    IOException - if an I/O exception occurs while receiving the datagram packet.
    
    PortUnreachableException - may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
  - setTTL
```
@Deprecated
protected abstract void setTTL(byte ttl)
                                    throws IOException
```
    Deprecated. use setTimeToLive instead.
    
    Set the TTL (time-to-live) option.
    
    Parameters:
    
    ttl - a byte specifying the TTL value
    
    Throws:
    
    IOException - if an I/O exception occurs while setting the time-to-live option.
    
    See Also:
    
    getTTL()
  - getTTL
```
@Deprecated
protected abstract byte getTTL()
                                    throws IOException
```
    Deprecated. use getTimeToLive instead.
    
    Retrieve the TTL (time-to-live) option.
    
    Returns:
    
    a byte representing the TTL value
    
    Throws:
    
    IOException - if an I/O exception occurs while retrieving the time-to-live option
    
    See Also:
    
    setTTL(byte)
  - setTimeToLive
```
protected abstract void setTimeToLive(int ttl)
                               throws IOException
```
    Set the TTL (time-to-live) option.
    
    Parameters:
    
    ttl - an int specifying the time-to-live value
    
    Throws:
    
    IOException - if an I/O exception occurs while setting the time-to-live option.
    
    See Also:
    
    getTimeToLive()
  - getTimeToLive
```
protected abstract int getTimeToLive()
                              throws IOException
```
    Retrieve the TTL (time-to-live) option.
    
    Returns:
    
    an int representing the time-to-live value
    
    Throws:
    
    IOException - if an I/O exception occurs while retrieving the time-to-live option
    
    See Also:
    
    setTimeToLive(int)
  - join
```
protected abstract void join(InetAddress inetaddr)
                      throws IOException
```
    Join the multicast group.
    
    Parameters:
    
    inetaddr - multicast address to join.
    
    Throws:
    
    IOException - if an I/O exception occurs while joining the multicast group.
  - leave
```
protected abstract void leave(InetAddress inetaddr)
                       throws IOException
```
    Leave the multicast group.
    
    Parameters:
    
    inetaddr - multicast address to leave.
    
    Throws:
    
    IOException - if an I/O exception occurs while leaving the multicast group.
  - joinGroup
```
protected abstract void joinGroup(SocketAddress mcastaddr,
                                  NetworkInterface netIf)
                           throws IOException
```
    Join the multicast group.
    
    Parameters:
    
    mcastaddr - address to join.
    
    netIf - specifies the local interface to receive multicast datagram packets
    
    Throws:
    
    IOException - if an I/O exception occurs while joining the multicast group
    
    Since:
    
    1.4
  - leaveGroup
```
protected abstract void leaveGroup(SocketAddress mcastaddr,
                                   NetworkInterface netIf)
                            throws IOException
```
    Leave the multicast group.
    
    Parameters:
    
    mcastaddr - address to leave.
    
    netIf - specified the local interface to leave the group at
    
    Throws:
    
    IOException - if an I/O exception occurs while leaving the multicast group
    
    Since:
    
    1.4
  - close
```
protected abstract void close()
```
    Close the socket.
  - getLocalPort
```
protected int getLocalPort()
```
    Gets the local port.
    
    Returns:
    
    an int representing the local port value
  - getFileDescriptor
```
protected java.io.FileDescriptor getFileDescriptor()
```
    Gets the datagram socket file descriptor.
    
    Returns:
    
    a FileDescriptor object representing the datagram socket file descriptor

Class DatagramSocketImpl

Field Summary

Fields

Fields inherited from interface java.net.SocketOptions

Constructor Summary

Constructors

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.net.SocketOptions

Field Detail

localPort

fd

Constructor Detail

DatagramSocketImpl

Method Detail

create

bind

send

connect

disconnect

peek

peekData

receive

setTTL

getTTL

setTimeToLive

getTimeToLive

join

leave

joinGroup

leaveGroup

close

getLocalPort

getFileDescriptor