org.jcsp.net.tcpip
Class TCPIPAddressID

java.lang.Object
  org.jcsp.net.NodeAddressID
      org.jcsp.net.tcpip.TCPIPAddressID

All Implemented Interfaces:

Serializable, Cloneable

public class TCPIPAddressID
extends NodeAddressID

Provides a concrete implementation of the abstract NodeAddressID for use with the TCP/IP link protocol. A TCP/IP node address consists of an internet host address (IP address) and 16bit IP port number.

Author:

Quickstone Technologies Limited

See Also:

Serialized Form

Constructor Summary

TCPIPAddressID(InetAddress host, int port, boolean isUnique)
Creates a TCPIPAddressID for a computer, given it's IP address and port number.

TCPIPAddressID(String host, int port, boolean isUnique)
Creates a TCPIPAddressID for a computer, given it's host name and port number.

Method Summary

boolean	equals(Object obj) Compares two TCPIPAddressID for equality.
static NodeAddressID	getAddressIDFromString(String stringForm) Constructs and returns a TCPIPv4 NodeAddressID from a String.
InetAddress	getHost() Returns the computer's IP address
int	getPort() Returns the computer's port number for incoming link requests.
ProtocolID	getProtocolID() Returns the ProtocolID for this address
protected String	getStringForm() Returns a string representation of the address suitable for use in the createAddressID method of TCPIPProtocolID.
int	hashCode() Returns a hashCode for this TCPIPAddressID
boolean	isGloballyUnique() Returns true if this NodeAddressID is known to be unique within the global org.jcsp.net domain.
String	toString() Returns a string representation of this TCPIPAddressID, in the form "123.45.67.234:5678".

Methods inherited from class org.jcsp.net.NodeAddressID

clone

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TCPIPAddressID

public TCPIPAddressID(InetAddress host,
                      int port,
                      boolean isUnique)
               throws IllegalArgumentException

Creates a TCPIPAddressID for a computer, given it's IP address and port number.

Parameters:

host - The computer's IP address.

port - The computer's port number, in the range 0-65535 inclusive.

isUnique - True if the address ID is globally unique, false otherwise.

Throws:

IllegalArgumentException - If the port is invalid.

TCPIPAddressID

public TCPIPAddressID(String host,
                      int port,
                      boolean isUnique)
               throws IllegalArgumentException,
                      UnknownHostException

Creates a TCPIPAddressID for a computer, given it's host name and port number.

Parameters:

host - The computer's IP address, as a string

port - The computer's port number.

Throws:

IllegalArgumentException - If the port is invalid.

UnknownHostException - If the host name cannot be resolved.

Method Detail

getAddressIDFromString

public static NodeAddressID getAddressIDFromString(String stringForm)
                                            throws IllegalArgumentException

Constructs and returns a TCPIPv4 NodeAddressID from a String. The String MUST be in the form of that returned from the getStringForm method.

Parameters:

stringForm - The String form representing a NodeAddressID.

Throws:

IllegalArgumentException - if the string is incorrectly formatted.

getStringForm

protected String getStringForm()

Returns a string representation of the address suitable for use in the createAddressID method of TCPIPProtocolID.

Specified by:

getStringForm in class NodeAddressID

Returns:

a String that can be passed to the static getAddressIDFromString(String) method in order to reconstuct the object.

getProtocolID

public ProtocolID getProtocolID()

Returns the ProtocolID for this address

Specified by:

getProtocolID in class NodeAddressID

Returns:

this NodeAddressID object's ProtocolID.

getHost

public final InetAddress getHost()

Returns the computer's IP address

Returns:

IP address of server.

getPort

public final int getPort()

Returns the computer's port number for incoming link requests.

Returns:

Port number of server.

equals

public final boolean equals(Object obj)

Compares two TCPIPAddressID for equality.

Specified by:

equals in class NodeAddressID

Parameters:

obj - another object that should be another NodeAddressID.

Returns:

true iff obj is a non-null TCPIPAddressID for the same port & host, false otherwise.

hashCode

public final int hashCode()

Returns a hashCode for this TCPIPAddressID

Specified by:

hashCode in class NodeAddressID

Returns:

an int hash code.

isGloballyUnique

public boolean isGloballyUnique()

Description copied from class: NodeAddressID

Returns true if this NodeAddressID is known to be unique within the global org.jcsp.net domain.

A Node may have several addresses. If a Node is on an internal network that is connected to the Internet, it may have one local address and one address that is accessible from the Internet. The Internet address may be globally unique whereas the local address may be duplicated in other internal networks. The NodeAddressID object representing the Internet address should return true when this method is called whereas the NodeAddressID representing the local address should return false.

Specified by:

isGloballyUnique in class NodeAddressID

Returns:

true iff this NodeAddressID is globally unique.

toString

public final String toString()

Returns a string representation of this TCPIPAddressID, in the form "123.45.67.234:5678".

Overrides:

toString in class Object

Returns:

A string representation of this ComputerID.