de.fuberlin.wiwiss.d2rq.algebra
Class TripleRelation
java.lang.Object
de.fuberlin.wiwiss.d2rq.algebra.TripleRelation
- All Implemented Interfaces:
- RDFRelation, TripleMaker
public class TripleRelation
- extends Object
- implements RDFRelation
A respresentation of a d2rq:PropertyBridge, describing how
a set of virtual triples are to be obtained
from a database. The virtual subjects, predicates and objects
are generated by NodeMaker
s.
- Version:
- $Id: TripleRelation.java,v 1.1 2006/09/28 12:17:44 cyganiak Exp $
- Author:
- Chris Bizer chris@bizer.de, Richard Cyganiak (richard@cyganiak.de)
Fields inherited from interface de.fuberlin.wiwiss.d2rq.algebra.RDFRelation |
EMPTY |
TripleRelation
public TripleRelation(Relation baseRelation,
NodeMaker subjectMaker,
NodeMaker predicateMaker,
NodeMaker objectMaker)
baseRelation
public Relation baseRelation()
- Specified by:
baseRelation
in interface RDFRelation
isUnique
public boolean isUnique()
- Specified by:
isUnique
in interface RDFRelation
projectionColumns
public Set projectionColumns()
- Specified by:
projectionColumns
in interface RDFRelation
nodeMaker
public NodeMaker nodeMaker(int index)
- Description copied from interface:
RDFRelation
- TODO Get rid of RDFRelation.nodeMaker(index)
- Specified by:
nodeMaker
in interface RDFRelation
- Parameters:
index
- 0, 1 or 2
- Returns:
- The subject, predicate or object NodeMaker
toString
public String toString()
- Overrides:
toString
in class Object
withPrefix
public RDFRelation withPrefix(int index)
makeTriples
public Collection makeTriples(ResultRow row)
- Specified by:
makeTriples
in interface TripleMaker
selectTriple
public RDFRelation selectTriple(com.hp.hpl.jena.graph.Triple t)
- Specified by:
selectTriple
in interface RDFRelation
renameColumns
public RDFRelation renameColumns(ColumnRenamer renamer)
- Specified by:
renameColumns
in interface RDFRelation
names
public Collection names()
- Specified by:
names
in interface RDFRelation
namedNodeMaker
public NodeMaker namedNodeMaker(String name)
- Specified by:
namedNodeMaker
in interface RDFRelation