org.jrdf.query.relation
Interface Relation

All Known Subinterfaces:

GraphRelation

All Known Implementing Classes:

GraphRelationImpl, RelationDEE, RelationDUM, RelationImpl

public interface Relation

Relations containing a set of tuples and a set of attributes. The attribute constitute a heading the maps to the tuple values.

Version:

$Revision: 1804 $

Author:

Andrew Newman

Method Summary

Set<Attribute>	getHeading() Returns the set of attributes or heading of the relation.
SortedSet<Attribute>	getSortedHeading()
SortedSet<Tuple>	getSortedTuples()
Set<Tuple>	getTuples() Returns the set of tuples.

Method Detail

getHeading

Set<Attribute> getHeading()

Returns the set of attributes or heading of the relation.

Returns:

the set of attributes or heading of the relation.

getTuples

Set<Tuple> getTuples()

Returns the set of tuples.

Returns:

a set of tuples.

getSortedHeading

SortedSet<Attribute> getSortedHeading()

getSortedTuples

SortedSet<Tuple> getSortedTuples()