org.knime.base.node.mine.subgroupminer.apriori

Class TIDItem

java.lang.Object

org.knime.base.node.mine.subgroupminer.apriori.TIDItem

All Implemented Interfaces:

Comparable<TIDItem>

public class TIDItem
extends Object
implements Comparable<TIDItem>

The TIDItem consists of an id and a BitSet, where each bit corresponds to a transaction id and is set, if this item is present in the transaction.

Author:

Fabian Dill, University of Konstanz

Constructor Summary

Constructors

Constructor and Description
TIDItem(int id) Creates an TIDItem with this id and present in no transaction.

Method Summary

Modifier and Type	Method and Description
void	addTID(int tid) Adds a transaction id to this item, thus, the item has to be present in this transaction.
TIDItem	clone()
int	compareTo(TIDItem theOther)
boolean	equals(Object obj)
int	getId()
int	getSupport() The support of this item, which is the number of transaction it is present in.
BitSet	getTransactionIDs() The transaction ids as a bitset, where the bit is set if the item is present in the corresponding transaction.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TIDItem

public TIDItem(int id)

Creates an TIDItem with this id and present in no transaction.

Parameters:

id - the id of this item

Method Detail

getId

public int getId()

Returns:

- the id of this item.

addTID

public void addTID(int tid)

Adds a transaction id to this item, thus, the item has to be present in this transaction.

Parameters:

tid - the transaction id of the transaction this item is present in

getSupport

public int getSupport()

The support of this item, which is the number of transaction it is present in.

Returns:

the support of this item, which is the numer of transactions it is present in

getTransactionIDs

public BitSet getTransactionIDs()

The transaction ids as a bitset, where the bit is set if the item is present in the corresponding transaction.

Returns:

the ids of the transactions this item appears in

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

clone

public TIDItem clone()

Overrides:

clone in class Object

compareTo

public int compareTo(TIDItem theOther)

Specified by:

compareTo in interface Comparable<TIDItem>

Parameters:

theOther - the object to compare to

Returns:

-1 if this is smaller, 0 if it is equal to the other and +1 if this is greater

toString

public String toString()

Overrides:

toString in class Object