ca.uqac.dim.turtledb

Class UnaryRelation

java.lang.Object

ca.uqac.dim.turtledb.Relation

ca.uqac.dim.turtledb.UnaryRelation

Direct Known Subclasses:

Projection, Renaming, Selection, VariableTable

public abstract class UnaryRelation
extends Relation

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	UnaryRelation.UnaryRelationCacheIterator
protected class	UnaryRelation.UnaryRelationStreamIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected Relation	m_relation

Fields inherited from class ca.uqac.dim.turtledb.Relation

m_streamingMode

Constructor Summary

Constructors

Constructor and Description
UnaryRelation()

Method Summary

Modifier and Type	Method and Description
void	setRelation(Relation r)
int	tupleCount() Returns the number of actual tuples present in the query.

Methods inherited from class ca.uqac.dim.turtledb.Relation

accept, cacheIterator, contains, getCardinality, getDegree, getSchema, isFragment, isLeaf, iterator, setStreamingMode, streamIterator, toString

Methods inherited from class java.lang.Object

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

Field Detail

m_relation

protected Relation m_relation

Constructor Detail

UnaryRelation

public UnaryRelation()

Method Detail

setRelation

public void setRelation(Relation r)

tupleCount

public int tupleCount()

Description copied from class: Relation

Returns the number of actual tuples present in the query. This number is different from the cardinality of the query; it counts the number of tuples that are present in the leaves of the query tree.

Specified by:

tupleCount in class Relation

Returns:

The tuple count