org.pentaho.aggdes.algorithm.impl

Class AggregateImpl

java.lang.Object

org.pentaho.aggdes.algorithm.impl.AggregateImpl

All Implemented Interfaces:

Aggregate

public class AggregateImpl
extends Object
implements Aggregate

Implementation of Aggregate.

Constructor Summary

Constructors

Constructor and Description
AggregateImpl(Schema schema, BitSetPlus bits)

Method Summary

Methods

Modifier and Type	Method and Description
double	estimateRowCount() Returns an estimate of the number of distinct values in this Aggregate.
double	estimateSpace() Returns an estimate of the amount of space (in bytes) required to store this Aggregate.
List<Attribute>	getAttributes() Returns a list of attributes in this aggregate table.
String	getCandidateTableName() Returns a suggestion for the name of a table in which to store this aggregate.
String	getDescription() Returns a text description of this aggregate
List<Measure>	getMeasures() Returns a list of measures in this aggregate table.
boolean	hasCompleteAncestors(List<BitSetPlus> ancestorClosure) Returns whether this Aggregate is closed with respect to ancestors.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateImpl

public AggregateImpl(Schema schema,
             BitSetPlus bits)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getAttributes

public List<Attribute> getAttributes()

Description copied from interface: Aggregate

Returns a list of attributes in this aggregate table.

Specified by:

getAttributes in interface Aggregate

Returns:

list of attributes in this aggregate table

getMeasures

public List<Measure> getMeasures()

Description copied from interface: Aggregate

Returns a list of measures in this aggregate table.

Specified by:

getMeasures in interface Aggregate

Returns:

list of measures in this aggregate table

estimateRowCount

public double estimateRowCount()

Description copied from interface: Aggregate

Returns an estimate of the number of distinct values in this Aggregate.

Specified by:

estimateRowCount in interface Aggregate

Returns:

estimated number of distinct values

estimateSpace

public double estimateSpace()

Description copied from interface: Aggregate

Returns an estimate of the amount of space (in bytes) required to store this Aggregate.

Specified by:

estimateSpace in interface Aggregate

Returns:

estimated space in bytes

getDescription

public String getDescription()

Description copied from interface: Aggregate

Returns a text description of this aggregate

Specified by:

getDescription in interface Aggregate

Returns:

description of aggregate

getCandidateTableName

public String getCandidateTableName()

Description copied from interface: Aggregate

Returns a suggestion for the name of a table in which to store this aggregate.

The suggestion does not need to be unique within the db schema or less than the database's table name limit, but the implementation should try to generate a name that is likely to be unique and descriptive in the first 20 or so characters.

Specified by:

getCandidateTableName in interface Aggregate

Returns:

candidate table name

hasCompleteAncestors

public boolean hasCompleteAncestors(List<BitSetPlus> ancestorClosure)

Returns whether this Aggregate is closed with respect to ancestors. If it contains an attribute but does not contain all of the ancestors of that attribute (see Attribute.getAncestorAttributes()), return false.

Parameters:

ancestorClosure - List containing, for each attribute ordinal, the ordinals of the ancestors of that attribute, and all of their ancestors, and so forth

Returns:

whether this Aggegate is closed with respect to ancestors