org.wikidata.query.rdf.blazegraph.inline.literal

Class WikibaseDateExtension<V extends com.bigdata.rdf.model.BigdataValue>

java.lang.Object

org.wikidata.query.rdf.blazegraph.inline.literal.AbstractMultiTypeExtension<V>

org.wikidata.query.rdf.blazegraph.inline.literal.WikibaseDateExtension<V>

Type Parameters:

V - Blazegraph value to expand. These are usually treated a bit roughly by Blazegraph - lots of rawtypes

All Implemented Interfaces:

com.bigdata.rdf.internal.constraints.IMathOpHandler, com.bigdata.rdf.internal.IExtension<V>

public class WikibaseDateExtension<V extends com.bigdata.rdf.model.BigdataValue>
extends AbstractMultiTypeExtension<V>
implements com.bigdata.rdf.internal.constraints.IMathOpHandler

This implementation of IExtension implements inlining for literals that represent xsd:dateTime literals. Unlike DateTimeExtension on which this is based, it stores the literals as time in seconds since the epoch. The seconds are encoded as an inline long. Also unlike DateTimeExtension it only supports UTC as the default time zone because UTC is king. This is needed because Wikidata contains dates that who's milliseconds since epoch don't fit into a long.

Field Summary

Fields

Modifier and Type	Field and Description
protected static DatatypeFactory	DATATYPE_FACTORY Datatype factory cache.

Constructor Summary

Constructors

Constructor and Description
WikibaseDateExtension(com.bigdata.rdf.internal.IDatatypeURIResolver resolver)

Method Summary

Modifier and Type	Method and Description
boolean	canInvokeMathOp(org.openrdf.model.Literal... args)
protected com.bigdata.rdf.internal.impl.literal.AbstractLiteralIV	createDelegateIV(org.openrdf.model.Literal literal, com.bigdata.rdf.model.BigdataURI dt) Attempts to convert the supplied value into an epoch representation and encodes the long in a delegate XSDNumericIV, and returns an LiteralExtensionIV to wrap the native type.
com.bigdata.rdf.internal.IV	doMathOp(org.openrdf.model.Literal l1, com.bigdata.rdf.internal.IV iv1, org.openrdf.model.Literal l2, com.bigdata.rdf.internal.IV iv2, com.bigdata.rdf.internal.constraints.MathBOp.MathOp op, com.bigdata.rdf.model.BigdataValueFactory vf)
protected com.bigdata.rdf.model.BigdataLiteral	safeAsValue(com.bigdata.rdf.internal.impl.literal.LiteralExtensionIV iv, com.bigdata.rdf.model.BigdataValueFactory vf, com.bigdata.rdf.model.BigdataURI dt) Use the long value of the XSDNumericIV delegate which represents seconds since the epoch to create a WikibaseDate and then represent that properly using xsd's string representations.

Methods inherited from class org.wikidata.query.rdf.blazegraph.inline.literal.AbstractMultiTypeExtension

asValue, createIV, getDatatypes, resolveDataType, resolveDataType

Methods inherited from class java.lang.Object

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

Field Detail

DATATYPE_FACTORY

protected static final DatatypeFactory DATATYPE_FACTORY

Datatype factory cache.

Constructor Detail

WikibaseDateExtension

public WikibaseDateExtension(com.bigdata.rdf.internal.IDatatypeURIResolver resolver)

Method Detail

createDelegateIV

protected com.bigdata.rdf.internal.impl.literal.AbstractLiteralIV createDelegateIV(org.openrdf.model.Literal literal,
                                                                                   com.bigdata.rdf.model.BigdataURI dt)

Attempts to convert the supplied value into an epoch representation and encodes the long in a delegate XSDNumericIV, and returns an LiteralExtensionIV to wrap the native type.

Specified by:

createDelegateIV in class AbstractMultiTypeExtension<V extends com.bigdata.rdf.model.BigdataValue>

safeAsValue

protected com.bigdata.rdf.model.BigdataLiteral safeAsValue(com.bigdata.rdf.internal.impl.literal.LiteralExtensionIV iv,
                                                           com.bigdata.rdf.model.BigdataValueFactory vf,
                                                           com.bigdata.rdf.model.BigdataURI dt)

Use the long value of the XSDNumericIV delegate which represents seconds since the epoch to create a WikibaseDate and then represent that properly using xsd's string representations.

Specified by:

safeAsValue in class AbstractMultiTypeExtension<V extends com.bigdata.rdf.model.BigdataValue>

canInvokeMathOp

public boolean canInvokeMathOp(org.openrdf.model.Literal... args)

Specified by:

canInvokeMathOp in interface com.bigdata.rdf.internal.constraints.IMathOpHandler

doMathOp

public com.bigdata.rdf.internal.IV doMathOp(org.openrdf.model.Literal l1,
                                            com.bigdata.rdf.internal.IV iv1,
                                            org.openrdf.model.Literal l2,
                                            com.bigdata.rdf.internal.IV iv2,
                                            com.bigdata.rdf.internal.constraints.MathBOp.MathOp op,
                                            com.bigdata.rdf.model.BigdataValueFactory vf)

Specified by:

doMathOp in interface com.bigdata.rdf.internal.constraints.IMathOpHandler