dk.dma.ais.filter

Class ReplayDuplicateFilter

java.lang.Object

dk.dma.ais.filter.ReplayDuplicateFilter

All Implemented Interfaces:

IPacketFilter

@ThreadSafe
public class ReplayDuplicateFilter
extends Object
implements IPacketFilter

A doublet filter for replayed streams

The doublet filter works by only allowing the same message through once in a time window. The six bit string of the message is used as unique identifier.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	ReplayDuplicateFilter.DoubletEntry An entry class with sixbit string and reception date

Constructor Summary

Constructors

Constructor and Description
ReplayDuplicateFilter() Instantiates a new Replay duplicate filter.
ReplayDuplicateFilter(long windowSize) Constructor given window size

Method Summary

Modifier and Type	Method and Description
long	getWindowSize() Gets window size.
boolean	rejectedByFilter(AisPacket packet) Rejected by filter boolean.
void	setWindowSize(long windowSize) Sets window size.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReplayDuplicateFilter

public ReplayDuplicateFilter()

Instantiates a new Replay duplicate filter.

ReplayDuplicateFilter

public ReplayDuplicateFilter(long windowSize)

Constructor given window size

Parameters:

windowSize - the window size

Method Detail

rejectedByFilter

public boolean rejectedByFilter(AisPacket packet)

Description copied from interface: IPacketFilter

Rejected by filter boolean.

Specified by:

rejectedByFilter in interface IPacketFilter

Parameters:

packet - the packet

Returns:

the boolean

getWindowSize

public long getWindowSize()

Gets window size.

Returns:

the window size

setWindowSize

public void setWindowSize(long windowSize)

Sets window size.

Parameters:

windowSize - the window size