uk.org.arlott.simon.hw.f24.lbsta
Class Network

java.lang.Object
  uk.org.arlott.simon.hw.f24.lbsta.Network

public class Network
extends java.lang.Object

Network object containing all the LANs, hosts and bridges on the network. Handles adding/removing components and one simulation iteration.

Field Summary

private java.util.HashMap<java.awt.Point,java.util.HashSet<BridgePort>>	bridgePortsIdx Index of bridge ports on the network.
private java.util.HashSet<Bridge>	bridges Bridges on the network.
private java.util.HashMap<java.awt.Point,java.util.HashSet<Bridge>>	bridgesIdx Index of bridges on the network.
private java.util.Vector<NetworkEvent>	events Events that were recoreded on the network.
private java.util.HashSet<Host>	hosts Hosts on the network.
private java.util.HashMap<java.awt.Point,Host>	hostsHIdx Index of horizontal hosts on the network.
private java.util.HashMap<java.awt.Point,Host>	hostsVIdx Index of vertical hosts on the network.
private java.util.HashSet<LAN>	lans LANs on the network.
private java.util.HashMap<java.awt.Point,LAN>	lansHIdx Index of horizontal LANs on the network.
private java.util.HashMap<java.awt.Point,LAN>	lansVIdx Index of vertical LANs on the network.
private java.util.HashSet<NetworkChangeListener>	listeners Listeners of network objects being changed.
private java.util.HashSet<Packet>	newPackets New packets to be added to the network.
private java.lang.Long	now Current network simulation time.
private java.util.HashSet<Packet>	packets Packets on the network.
private java.lang.Boolean	saved Saved status of the network and script.

Constructor Summary

Network()

Method Summary

boolean	add(Bridge obj) Adds a bridge to the network.
boolean	add(Bridge obj, boolean test) Adds a bridge to the network.
boolean	add(Host obj) Adds a host to the network.
boolean	add(Host obj, boolean test) Adds a host to the network.
boolean	add(LAN obj) Adds a LAN to the network.
boolean	add(LAN obj, boolean test) Adds a LAN to the network.
void	addChangeListener(NetworkChangeListener ncl) Adds a change listener to those requiring updates of changes to network components.
void	addPacket(Packet packet) Adds a packet to the network.
private static boolean	detectLoop(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet) Detects loops of LANs.
private static boolean	detectLoop(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet, java.util.HashSet<LAN> seenSet, LAN parent, LAN current) Detects loops of LANs.
void	event(NetworkEvent event) Adds a new event to the list of events that have occured.
java.util.Vector<Bridge>	getBridges() Gets the bridges on the network.
LAN	getHLAN(java.awt.Point p) Gets the horizontal LAN at a given point.
java.util.Vector<Host>	getHosts() Gets the hosts on the network.
java.util.Vector<LAN>	getLANs() Gets the LANs on the network.
java.lang.Object	getObjectAt(java.awt.Point p) Tries to find a component at a given point.
long	getTime() Gets the current network simulation time.
LAN	getVLAN(java.awt.Point p) Gets the vertical LAN at a given point.
boolean	isSaved() Gets the save state of the network.
private void	linkBridgePorts(BridgePort b) Links any bridge ports at the same location to a BridgePort
private void	linkBridgePorts(LAN l, int x, int y) Links any bridge ports at the given position to a LAN
void	markSaved() Marks the network as being saved.
void	networkChanged() Marks the network as being changed (not saved).
void	notifyListeners(java.lang.Object o) Notifies the current change listeners of a change to a network component.
private static void	putCheckSet(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet, LAN l) Put l into checkSet for loop detection
private void	queuePacket(java.lang.Object source, PacketDestination destination, PacketTransport location, int direction, PacketData data) Queues a packet to be added to the network.
private void	queuePacket(java.util.Vector<Packet> packets, java.lang.Object source) Queues packets to be added to the network.
private void	reconnectLANs(LAN a, LAN b) Reconnect two LANs together when a dividing LAN has been removed.
boolean	remove(Bridge obj) Removes a bridge from the network.
boolean	remove(Host obj, boolean disconnect) Removes a Host from the network.
boolean	remove(LAN obj, boolean disconnect) Removes a LAN from the network.
void	removeAll(Script script) Removes all the network components and resets the script.
void	removeAllPackets() Removes all the packets from the network components.
void	removeChangeListener(NetworkChangeListener ncl) Removes a change listener from those requiring updates of changes to network components.
java.util.Vector<NetworkEvent>	run() Performs one network simulation iteration.
void	setTime(long time) Sets the current network simulation time.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

listeners

private final java.util.HashSet<NetworkChangeListener> listeners

Listeners of network objects being changed.

lans

private java.util.HashSet<LAN> lans

LANs on the network.

lansHIdx

private java.util.HashMap<java.awt.Point,LAN> lansHIdx

Index of horizontal LANs on the network.

lansVIdx

private java.util.HashMap<java.awt.Point,LAN> lansVIdx

Index of vertical LANs on the network.

hosts

private java.util.HashSet<Host> hosts

Hosts on the network.

hostsHIdx

private java.util.HashMap<java.awt.Point,Host> hostsHIdx

Index of horizontal hosts on the network.

hostsVIdx

private java.util.HashMap<java.awt.Point,Host> hostsVIdx

Index of vertical hosts on the network.

bridges

private java.util.HashSet<Bridge> bridges

Bridges on the network.

bridgesIdx

private java.util.HashMap<java.awt.Point,java.util.HashSet<Bridge>> bridgesIdx

Index of bridges on the network.

bridgePortsIdx

private java.util.HashMap<java.awt.Point,java.util.HashSet<BridgePort>> bridgePortsIdx

Index of bridge ports on the network.

packets

private java.util.HashSet<Packet> packets

Packets on the network.

newPackets

private java.util.HashSet<Packet> newPackets

New packets to be added to the network.

events

private final java.util.Vector<NetworkEvent> events

Events that were recoreded on the network.

saved

private java.lang.Boolean saved

Saved status of the network and script.

now

private java.lang.Long now

Current network simulation time.

Constructor Detail

Network

public Network()

Method Detail

getLANs

public java.util.Vector<LAN> getLANs()

Gets the LANs on the network.

Returns:

All the LANs that are in this network.

getHLAN

public LAN getHLAN(java.awt.Point p)

Gets the horizontal LAN at a given point.

Parameters:

p - The position to check for a LAN.

Returns:

The LAN if found.

getVLAN

public LAN getVLAN(java.awt.Point p)

Gets the vertical LAN at a given point.

Parameters:

p - The position to check for a LAN.

Returns:

The LAN if found.

getHosts

public java.util.Vector<Host> getHosts()

Gets the hosts on the network.

Returns:

All the hosts that are in this network.

getBridges

public java.util.Vector<Bridge> getBridges()

Gets the bridges on the network.

Returns:

All the bridges that are in this network.

removeAll

public void removeAll(Script script)

Removes all the network components and resets the script.

Parameters:

script - The Script to reset.

removeAllPackets

public void removeAllPackets()

Removes all the packets from the network components.

isSaved

public boolean isSaved()

Gets the save state of the network.

Returns:

true if the network has not been modified since it was saved.

markSaved

public void markSaved()

Marks the network as being saved.

networkChanged

public void networkChanged()

Marks the network as being changed (not saved).

getTime

public long getTime()

Gets the current network simulation time.

Returns:

The time in milliseconds.

setTime

public void setTime(long time)

Sets the current network simulation time.

Parameters:

time - The time in milliseconds.

getObjectAt

public java.lang.Object getObjectAt(java.awt.Point p)

Tries to find a component at a given point.

Parameters:

p - The position to check for component.

Returns:

The found network component.

addChangeListener

public void addChangeListener(NetworkChangeListener ncl)

Adds a change listener to those requiring updates of changes to network components.

Parameters:

ncl - A NetworkChangeListener.

removeChangeListener

public void removeChangeListener(NetworkChangeListener ncl)

Removes a change listener from those requiring updates of changes to network components.

Parameters:

ncl - A NetworkChangeListener.

notifyListeners

public void notifyListeners(java.lang.Object o)

Notifies the current change listeners of a change to a network component.

Parameters:

o - The component that has been changed.

add

public boolean add(LAN obj)
            throws LoopException,
                   InvalidPositionException

Adds a LAN to the network.

Parameters:

obj - The LAN to add.

Returns:

true if successful.

Throws:

LoopException - If the new LAN will cause a loop to be formed.

InvalidPositionException - If the LAN is in an invalid position.

add

public boolean add(LAN obj,
                   boolean test)
            throws LoopException,
                   InvalidPositionException

Adds a LAN to the network.

Parameters:

obj - The LAN to add.

test - true if the addition should be checked but not completed.

Returns:

true if successful.

Throws:

LoopException - If the new LAN will cause a loop to be formed.

InvalidPositionException - If the LAN is in an invalid position.

putCheckSet

private static void putCheckSet(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet,
                                LAN l)

Put l into checkSet for loop detection

Parameters:

l - LAN to add

checkSet - HashMap to add LAN to

detectLoop

private static boolean detectLoop(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet)

Detects loops of LANs.

Parameters:

checkSet - The set of LANs to be checked.

Returns:

true if there is a loop.

detectLoop

private static boolean detectLoop(java.util.HashMap<java.awt.Point,java.util.HashSet<LAN>> checkSet,
                                  java.util.HashSet<LAN> seenSet,
                                  LAN parent,
                                  LAN current)

Detects loops of LANs.

Parameters:

checkSet - The set of LANs to be checked.

seenSet - The set of LANs that have been seen.

parent - The previous LAN that was/is being checked.

current - The current LAN being checked.

Returns:

true if there is a loop.

add

public boolean add(Host obj)
            throws InvalidPositionException,
                   TooManyHostsException

Adds a host to the network.

Parameters:

obj - The Host to add.

Returns:

true if successful.

Throws:

InvalidPositionException - If the host is in an invalid position.

TooManyHostsException - If the maximum number of hosts has been reached.

add

public boolean add(Host obj,
                   boolean test)
            throws InvalidPositionException,
                   TooManyHostsException

Adds a host to the network.

Parameters:

obj - The Host to add.

test - true if the addition should be checked but not completed.

Returns:

true if successful.

Throws:

InvalidPositionException - If the host is in an invalid position.

TooManyHostsException - If the maximum number of hosts has been reached.

add

public boolean add(Bridge obj)
            throws InvalidPositionException,
                   TooManyBridgesException

Adds a bridge to the network.

Parameters:

obj - The Bridge to add.

Returns:

true if successful.

Throws:

InvalidPositionException - If the host is in an invalid position.

TooManyBridgesException - If the maximum number of bridges has been reached.

add

public boolean add(Bridge obj,
                   boolean test)
            throws InvalidPositionException,
                   TooManyBridgesException

Adds a bridge to the network.

Parameters:

obj - The Bridge to add.

test - true if the addition should be checked but not completed.

Returns:

true if successful.

Throws:

InvalidPositionException - If the host is in an invalid position.

TooManyBridgesException - If the maximum number of bridges has been reached.

linkBridgePorts

private void linkBridgePorts(LAN l,
                             int x,
                             int y)

Links any bridge ports at the given position to a LAN

Parameters:

l - The LAN to link any found bridge ports to.

x - The X co-ordinate positon to check.

y - The Y co-ordinate positon to check.

linkBridgePorts

private void linkBridgePorts(BridgePort b)

Links any bridge ports at the same location to a BridgePort

Parameters:

b - The BridgePort to link any found bridge ports to.

remove

public boolean remove(LAN obj,
                      boolean disconnect)

Removes a LAN from the network.

Parameters:

obj - The LAN to remove.

disconnect - true if hosts should be disconnected.

Returns:

true if the LAN was in the network.

reconnectLANs

private void reconnectLANs(LAN a,
                           LAN b)

Reconnect two LANs together when a dividing LAN has been removed.

Parameters:

a - The left/top LAN.

b - The right/bottom LAN.

remove

public boolean remove(Host obj,
                      boolean disconnect)

Removes a Host from the network.

Parameters:

obj - The Host to remove.

disconnect - true if the host should be disconnected from its LAN.

Returns:

true if the host was in the network.

remove

public boolean remove(Bridge obj)

Removes a bridge from the network.

Parameters:

obj - The Bridge to remove.

Returns:

true if the bridge was in the network.

run

public java.util.Vector<NetworkEvent> run()

Performs one network simulation iteration.

Returns:

Any new events that occured.

queuePacket

private void queuePacket(java.lang.Object source,
                         PacketDestination destination,
                         PacketTransport location,
                         int direction,
                         PacketData data)

Queues a packet to be added to the network.

Parameters:

source - Source of the packet.

destination - Destination of the packet.

location - Intial location of the packet.

direction - Direction on the location of the packet.

data - The data contained in the packet.

queuePacket

private void queuePacket(java.util.Vector<Packet> packets,
                         java.lang.Object source)

Queues packets to be added to the network.

Parameters:

packets - Packets to be added.

source - Source of the packets.

addPacket

public void addPacket(Packet packet)

Adds a packet to the network.

Parameters:

packet - The Packet to add.

event

public void event(NetworkEvent event)

Adds a new event to the list of events that have occured.

Parameters:

event - The new NetworkEvent to add.