ca.pfv.spmf.algorithms.sequentialpatterns.fournier2008_seqdim

Class Itemset

java.lang.Object

ca.pfv.spmf.algorithms.sequentialpatterns.fournier2008_seqdim.Itemset

public class Itemset
extends java.lang.Object

This class represents an itemset as used by the SeqDim and Fournier-Viger 2008 algorithm.

An itemset is a set of items and an optional timestamp.

See Also:

AlgoSeqDim, AlgoFournierViger08

Constructor Summary

Constructors

Constructor and Description
Itemset() Default constructor
Itemset(ItemSimple item, long timestamp) Constructor

Method Summary

Modifier and Type	Method and Description
void	addItem(ItemSimple item) Add an item to this itemset.
Itemset	cloneItemSet() Make an exact copy of this itemset.
Itemset	cloneItemSetMinusItems(java.util.Map<ItemSimple,java.util.Set<java.lang.Integer>> mapSequenceID, double relativeMinsup) Make a copy of this itemset but without infrequent items
ItemSimple	get(int index) Get the i-th item in this itemset
java.util.List<ItemSimple>	getItems() Get the List of items contained in this Itemset.
long	getTimestamp() Get the timestamp
void	print() Print this item to System.out.
void	setTimestamp(long timestamp) Set the timestamp of this itemset.
int	size() Get the number of items.
java.lang.String	toString() Get a String representation of this item.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Itemset

public Itemset(ItemSimple item,
               long timestamp)

Constructor

Parameters:

item - an item

timestamp - a timestamp

Itemset

public Itemset()

Default constructor

Method Detail

addItem

public void addItem(ItemSimple item)

Add an item to this itemset.

Parameters:

item - an Item

getItems

public java.util.List<ItemSimple> getItems()

Get the List of items contained in this Itemset.

Returns:

a List of items

get

public ItemSimple get(int index)

Get the i-th item in this itemset

Parameters:

index - the position i

Returns:

the Item

print

public void print()

Print this item to System.out.

toString

public java.lang.String toString()

Get a String representation of this item.

Overrides:

toString in class java.lang.Object

Returns:

a String

cloneItemSetMinusItems

public Itemset cloneItemSetMinusItems(java.util.Map<ItemSimple,java.util.Set<java.lang.Integer>> mapSequenceID,
                                      double relativeMinsup)

Make a copy of this itemset but without infrequent items

Parameters:

mapSequenceID - a map indicating the IDs of sequence (value) containing each item (key).

relativeMinsup - a relative minimum support (integer)

Returns:

a new Itemset

cloneItemSet

public Itemset cloneItemSet()

Make an exact copy of this itemset.

Returns:

a new Itemset.

getTimestamp

public long getTimestamp()

Get the timestamp

Returns:

the timestamp

setTimestamp

public void setTimestamp(long timestamp)

Set the timestamp of this itemset.

Parameters:

timestamp - the timestamp.

size

public int size()

Get the number of items.

Returns:

an integer.