Package edu.harvard.seas.pl.abcdatalog.engine.topdown

Class QsqSupRelation

java.lang.Object

edu.harvard.seas.pl.abcdatalog.engine.topdown.Relation

edu.harvard.seas.pl.abcdatalog.engine.topdown.QsqSupRelation

All Implemented Interfaces:

Iterable<Tuple>

public class QsqSupRelation
extends Relation

A supplementary relation used in QSQ evaluation.

It is modeled as a node in a linked list. The intention is that each node contains the tuples for the supplementary relation itself, a pointer to the atom that appears after the supplementary relation in the relevant rule, and a pointer to the next supplementary relation in the same rule.

Field Summary

Fields

Modifier and Type	Field	Description
QsqSupRelation	next	Points to the next supplementary relation in the rule being evaluated.
AdornedAtom	nextAtom	Points to the atom that follows this supplementary relation in the rule being evaluated.

Fields inherited from class edu.harvard.seas.pl.abcdatalog.engine.topdown.Relation

arity, attributes, tuples

Constructor Summary

Constructors

Constructor	Description
QsqSupRelation(TermSchema schema)	Constructs an empty supplementary relation with the supplied schema.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
int	hashCode()
String	toString()

Methods inherited from class edu.harvard.seas.pl.abcdatalog.engine.topdown.Relation

add, addAll, applyTuplesAsSubstitutions, contains, filter, getAttributes, isEmpty, iterator, joinAndProject, project, removeAll, renameAttributes, size

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Details

next

public QsqSupRelation next

Points to the next supplementary relation in the rule being evaluated.

nextAtom

public AdornedAtom nextAtom

Points to the atom that follows this supplementary relation in the rule being evaluated.

Constructor Details

QsqSupRelation

public QsqSupRelation(TermSchema schema)

Constructs an empty supplementary relation with the supplied schema.

Parameters:

schema - schema of supplementary relation

Method Details

toString

public String toString()

Overrides:

toString in class Relation

hashCode

public int hashCode()

Overrides:

hashCode in class Relation

equals

public boolean equals(Object obj)

Overrides:

equals in class Relation