ca.uqac.dim.turtledb

Class Join

java.lang.Object

ca.uqac.dim.turtledb.Relation

ca.uqac.dim.turtledb.BinaryRelation

ca.uqac.dim.turtledb.Join

public class Join
extends BinaryRelation

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	Join.JoinCacheIterator
protected class	Join.JoinStreamIterator

Nested classes/interfaces inherited from class ca.uqac.dim.turtledb.BinaryRelation

BinaryRelation.BinaryRelationCacheIterator, BinaryRelation.BinaryRelationStreamIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected Condition	m_condition
protected Product	m_product

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

m_left, m_right

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

m_streamingMode

Constructor Summary

Constructors

Constructor and Description
Join()
Join(Condition c)

Method Summary

Modifier and Type	Method and Description
void	accept(QueryVisitor v)
void	addOperand(Relation r)
RelationIterator	cacheIterator() Returns an iterator over tuples of the relation
Schema	getSchema() Returns the relation's schema
void	setCondition(Condition c)
RelationIterator	streamIterator() Returns an iterator over tuples of the relation
int	tupleCount() Returns the number of actual tuples present in the query.

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

acceptBinary, getLeft, getRight, setLeft, setRight

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

contains, getCardinality, getDegree, isFragment, isLeaf, iterator, setStreamingMode, toString

Methods inherited from class java.lang.Object

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

Field Detail

m_product

protected Product m_product

m_condition

protected Condition m_condition

Constructor Detail

Join

public Join()

Join

public Join(Condition c)

Method Detail

setCondition

public void setCondition(Condition c)

getSchema

public Schema getSchema()

Description copied from class: Relation

Returns the relation's schema

Specified by:

getSchema in class Relation

Returns:

The schema

addOperand

public void addOperand(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.

Overrides:

tupleCount in class BinaryRelation

Returns:

The tuple count

accept

public void accept(QueryVisitor v)
            throws QueryVisitor.VisitorException

Specified by:

accept in class Relation

Throws:

QueryVisitor.VisitorException

streamIterator

public RelationIterator streamIterator()

Description copied from class: Relation

Returns an iterator over tuples of the relation

Specified by:

streamIterator in class Relation

Returns:

cacheIterator

public RelationIterator cacheIterator()

Description copied from class: Relation

Returns an iterator over tuples of the relation

Specified by:

cacheIterator in class Relation

Returns: