dk.dma.ais.filter

Class DuplicateFilter

java.lang.Object

dk.dma.ais.filter.MessageFilterBase

dk.dma.ais.filter.DuplicateFilter

All Implemented Interfaces:

IMessageFilter, IPacketFilter

@ThreadSafe
public class DuplicateFilter
extends MessageFilterBase

A doublet filter.

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	DuplicateFilter.DoubletEntry An entry class with sixbit string and reception date

Constructor Summary

Constructors

Constructor and Description
DuplicateFilter() Instantiates a new Duplicate filter.
DuplicateFilter(long windowSize) Constructor given window size

Method Summary

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

Methods inherited from class dk.dma.ais.filter.MessageFilterBase

rejectedByFilter

Methods inherited from class java.lang.Object

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

Constructor Detail

DuplicateFilter

public DuplicateFilter()

Instantiates a new Duplicate filter.

DuplicateFilter

public DuplicateFilter(long windowSize)

Constructor given window size

Parameters:

windowSize - the window size

Method Detail

rejectedByFilter

public boolean rejectedByFilter(AisMessage message)

Description copied from interface: IMessageFilter

Rejected by filter boolean.

Parameters:

message - the message

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