Package org.wikidata.wdtk.rdf.values

Class AnyValueConverter

java.lang.Object

org.wikidata.wdtk.rdf.values.AnyValueConverter

All Implemented Interfaces:

ValueVisitor<org.eclipse.rdf4j.model.Value>, ValueConverter<Value>

public class AnyValueConverter
extends Object
implements ValueConverter<Value>, ValueVisitor<org.eclipse.rdf4j.model.Value>

Class to convert Wikibase data values to RDF. The class is a visitor that that computes an RDF value (URI or literal) to represent any kind of Wikibase data value. Some values are complex and require further RDF triples to be written. In such cases, the class stores the values to a buffer. Methods for writing additional triples for these buffered values can be called later.

Author:

Markus Kroetzsch

Constructor Summary

Constructors

Constructor	Description
AnyValueConverter(RdfWriter rdfWriter, OwlDeclarationBuffer rdfConversionBuffer, PropertyRegister propertyRegister)

Method Summary

Modifier and Type	Method	Description
org.eclipse.rdf4j.model.Value	getRdfValue(Value value, PropertyIdValue propertyIdValue, boolean simple)	Returns an RDF value that should be used to represent the given Wikibase data value in RDF.
org.eclipse.rdf4j.model.Value	visit(EntityIdValue value)	Visits a EntityIdValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(GlobeCoordinatesValue value)	Visits a GlobeCoordinatesValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(MonolingualTextValue value)	Visits a MonolingualTextValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(QuantityValue value)	Visits a QuantityValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(StringValue value)	Visits a StringValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(TimeValue value)	Visits a TimeValue and returns a result.
org.eclipse.rdf4j.model.Value	visit(UnsupportedValue value)	Visits an UnsupportedValue and returns a result
void	writeAuxiliaryTriples()	Writes auxiliary triples that might be needed to encode a Wikibase value in RDF.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AnyValueConverter

public AnyValueConverter(RdfWriter rdfWriter,
 OwlDeclarationBuffer rdfConversionBuffer,
 PropertyRegister propertyRegister)

Method Details

getRdfValue

public org.eclipse.rdf4j.model.Value getRdfValue(Value value,
 PropertyIdValue propertyIdValue,
 boolean simple)

Description copied from interface: ValueConverter

Returns an RDF value that should be used to represent the given Wikibase data value in RDF.

Specified by:

getRdfValue in interface ValueConverter<Value>

Parameters:

value - the value to convert

propertyIdValue - the property for which this value was used; this provides important context information for the conversion

simple - if true, use a simplified conversion to RDF and do not convert values that are inherently complex

Returns:

the RDF value to use for representing the data value in RDF

visit

public org.eclipse.rdf4j.model.Value visit(EntityIdValue value)

Description copied from interface: ValueVisitor

Visits a EntityIdValue and returns a result. In practice, only specific subtypes of EntityIdValue are used, such as ItemIdValue and PropertyIdValue. Since the set of possible subtypes can be extended by extensions of Wikibase, the visitor only visits the general (abstract) supertype. Implementations will have to decide if the given specific type is supported and what to do with it.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

visit

public org.eclipse.rdf4j.model.Value visit(GlobeCoordinatesValue value)

Description copied from interface: ValueVisitor

Visits a GlobeCoordinatesValue and returns a result.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

visit

public org.eclipse.rdf4j.model.Value visit(MonolingualTextValue value)

Description copied from interface: ValueVisitor

Visits a MonolingualTextValue and returns a result.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

visit

public org.eclipse.rdf4j.model.Value visit(QuantityValue value)

Description copied from interface: ValueVisitor

Visits a QuantityValue and returns a result.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

visit

public org.eclipse.rdf4j.model.Value visit(StringValue value)

Description copied from interface: ValueVisitor

Visits a StringValue and returns a result.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

visit

public org.eclipse.rdf4j.model.Value visit(TimeValue value)

Description copied from interface: ValueVisitor

Visits a TimeValue and returns a result.

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value

writeAuxiliaryTriples

public void writeAuxiliaryTriples()
                           throws org.eclipse.rdf4j.rio.RDFHandlerException

Description copied from interface: ValueConverter

Writes auxiliary triples that might be needed to encode a Wikibase value in RDF.

Specified by:

writeAuxiliaryTriples in interface ValueConverter<Value>

Throws:

org.eclipse.rdf4j.rio.RDFHandlerException - if there is a problem writing the triples

visit

public org.eclipse.rdf4j.model.Value visit(UnsupportedValue value)

Description copied from interface: ValueVisitor

Visits an UnsupportedValue and returns a result

Specified by:

visit in interface ValueVisitor<org.eclipse.rdf4j.model.Value>

Parameters:

value - the value to visit

Returns:

the result for this value