com.rapidminer.krimp

Class Database

java.lang.Object

com.rapidminer.krimp.Database

All Implemented Interfaces:

java.lang.Iterable<java.util.Set<com.rapidminer.operator.learner.associations.Item>>

public class Database
extends java.lang.Object
implements java.lang.Iterable<java.util.Set<com.rapidminer.operator.learner.associations.Item>>

This class models a database which is supposed to consist of transactions, that are sets of items.

Author:

Siby

Constructor Summary

Constructors

Constructor and Description
Database(com.rapidminer.example.ExampleSet exampleSet) Constructs a database.

Method Summary

Methods

Modifier and Type	Method and Description
int	getFrequency(java.util.Set<com.rapidminer.operator.learner.associations.Item> transaction) Returns how often a specialized transaction is contained inside the database.
java.util.Set<com.rapidminer.operator.learner.associations.Item>	getItems() Returns the contained items.
int	getNumberOfStoredItems() Returns the number of stored items in this database.
int	getNumberOfTransactions() Returns the number of transactions inside this database.
com.rapidminer.operator.learner.associations.FrequentItemSet	getThisItems(com.rapidminer.operator.learner.associations.FrequentItemSet freqItemSet) Hilfsmethode um dem dummen Fehler zu umgehen..
java.util.Iterator<java.util.Set<com.rapidminer.operator.learner.associations.Item>>	iterator()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Database

public Database(com.rapidminer.example.ExampleSet exampleSet)

Constructs a database.

Parameters:

exampleSet - an exampleSet of boolean attributes, which builds the database

Method Detail

getNumberOfStoredItems

public int getNumberOfStoredItems()

Returns the number of stored items in this database. This number is equal to the sum of the support of all singleton itemsets.

Returns:

the number of stored items in this database

getItems

public java.util.Set<com.rapidminer.operator.learner.associations.Item> getItems()

Returns the contained items.

Returns:

a set of the contained items

getThisItems

public com.rapidminer.operator.learner.associations.FrequentItemSet getThisItems(com.rapidminer.operator.learner.associations.FrequentItemSet freqItemSet)

Hilfsmethode um dem dummen Fehler zu umgehen..

Parameters:

itemSet -

Returns:

iterator

public java.util.Iterator<java.util.Set<com.rapidminer.operator.learner.associations.Item>> iterator()

Specified by:

iterator in interface java.lang.Iterable<java.util.Set<com.rapidminer.operator.learner.associations.Item>>

getNumberOfTransactions

public int getNumberOfTransactions()

Returns the number of transactions inside this database.

Returns:

the number of transactions inside this database

getFrequency

public int getFrequency(java.util.Set<com.rapidminer.operator.learner.associations.Item> transaction)

Returns how often a specialized transaction is contained inside the database.

Parameters:

transaction - the transaction whose number of occurrences is determined

Returns:

the number of occurrences of the transaction in the database

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object