ca.uqac.dim.turtledb

Class Selection

java.lang.Object

ca.uqac.dim.turtledb.Relation

ca.uqac.dim.turtledb.UnaryRelation

ca.uqac.dim.turtledb.Selection

public class Selection
extends UnaryRelation

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	Selection.SelectionCacheIterator
protected class	Selection.SelectionStreamIterator

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

UnaryRelation.UnaryRelationCacheIterator, UnaryRelation.UnaryRelationStreamIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected Condition	m_condition

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

m_relation

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

m_streamingMode

Constructor Summary

Constructors

Constructor and Description
Selection(Condition c, Relation r)

Method Summary

Modifier and Type	Method and Description
void	accept(QueryVisitor v)
RelationIterator	cacheIterator() Returns an iterator over tuples of the relation
Schema	getSchema() Returns the relation's schema
void	setCondition(Condition c)
RelationStreamIterator	streamIterator() Returns an iterator over tuples of the relation

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

setRelation, tupleCount

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_condition

protected Condition m_condition

Constructor Detail

Selection

public Selection(Condition c,
                 Relation r)

Method Detail

getSchema

public Schema getSchema()

Description copied from class: Relation

Returns the relation's schema

Specified by:

getSchema in class Relation

Returns:

The schema

setCondition

public void setCondition(Condition c)

accept

public void accept(QueryVisitor v)
            throws QueryVisitor.VisitorException

Specified by:

accept in class Relation

Throws:

QueryVisitor.VisitorException

streamIterator

public RelationStreamIterator 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: