Interface MappingRelation

All Known Implementing Classes:

BaseForMappingRelationImpl, MappingOpExtend.MyMappingRelation, MappingOpExtract.MyMappingRelation, MappingOpProject.MyMappingRelation, MappingOpUnion.MyMappingRelation, MappingRelationImplWithColumnLayout, MappingRelationImplWithoutTuples, MappingRelationImplWithTupleLayout

public interface MappingRelation

Field Summary

Fields

Modifier and Type	Field	Description
static final org.apache.jena.graph.Node	errorNode	To be used as the error symbol in mapping relations.
static final String	gAttr
static final String	oAttr
static final String	pAttr
static final String	sAttr
static final Set<String>	spogAttrs

Method Summary

Modifier and Type	Method	Description
MappingRelationCursor	getCursor()
List<String>	getSchema()	Returns the set of attributes for which the tuples in this relation have values.

Field Details

errorNode

static final org.apache.jena.graph.Node errorNode

To be used as the error symbol in mapping relations.

sAttr

static final String sAttr

See Also:

• Constant Field Values

pAttr

static final String pAttr

See Also:

• Constant Field Values

oAttr

static final String oAttr

See Also:

• Constant Field Values

gAttr

static final String gAttr

See Also:

• Constant Field Values

spogAttrs

static final Set<String> spogAttrs

Method Details

getSchema

List<String> getSchema()

Returns the set of attributes for which the tuples in this relation have values. The returned list can be assumed to be duplicate free.

The order of the attributes in the returned list is relevant when accessing the values of the tuples via a cursor for this relation (see MappingRelationCursor.getValueOfCurrentTuple(int)).

getCursor

MappingRelationCursor getCursor()