Package org.eclipse.rdf4j.query.algebra.evaluation.function

Interface Function

All Known Implementing Classes:

Abs, BinaryFunction, BooleanCast, BooleanCast, ByteCast, CastFunction, Ceil, Concat, Contains, DateCast, DateTimeCast, DateTimeCast, Day, DecimalCast, DecimalCast, DoubleCast, DoubleCast, EncodeForUri, FloatCast, FloatCast, Floor, HashFunction, Hours, IntCast, IntegerCast, IntegerCast, IntegerCastFunction, IsTripleFunction, LongCast, LowerCase, MD5, Minutes, Month, NegativeIntegerCast, NonNegativeIntegerCast, NonPositiveIntegerCast, Now, PositiveIntegerCast, Rand, Replace, Round, Seconds, SHA1, SHA256, SHA384, SHA512, ShortCast, StatementFunction, StrAfter, StrBefore, StrDt, StrEnds, StringCast, StringCast, StrLang, StrLen, StrStarts, STRUUID, Substring, Timezone, TripleObjectFunction, TriplePredicateFunction, TripleSubjectFunction, Tz, UnaryFunction, UnsignedByteCast, UnsignedIntCast, UnsignedLongCast, UnsignedShortCast, UpperCase, UUID, Year

public interface Function

A query function, which can be a built-in function in the query language, or a custom function as documented in the SPARQL 1.1 Query Language Recommendation.

Author:

Arjohn Kampman, Jeen Broekstra

See Also:

FunctionRegistry

Method Summary

Modifier and Type	Method	Description
org.eclipse.rdf4j.model.Value	evaluate(org.eclipse.rdf4j.model.ValueFactory valueFactory, org.eclipse.rdf4j.model.Value... args)	Deprecated. since 3.3.0.
default org.eclipse.rdf4j.model.Value	evaluate(TripleSource tripleSource, org.eclipse.rdf4j.model.Value... args)	Evaluate the function over the supplied input arguments.
String	getURI()
default boolean	mustReturnDifferentResult()	UUID() and STRUUID() must return a different result for each invocation.

Method Detail

getURI

String getURI()

evaluate

@Deprecated
org.eclipse.rdf4j.model.Value evaluate(org.eclipse.rdf4j.model.ValueFactory valueFactory,
                                       org.eclipse.rdf4j.model.Value... args)
                                throws ValueExprEvaluationException

Deprecated.

since 3.3.0. Use evaluate(TripleSource, Value...) instead. A reference to a ValueFactory can be retrieved using TripleSource.getValueFactory() if needed.

Evaluate the function over the supplied input arguments, using the supplied ValueFactory to produce the result.

Parameters:

valueFactory - a ValueFactory to use for producing the function result.

args - the function input arguments.

Returns:

the function result value.

Throws:

ValueExprEvaluationException

evaluate

default org.eclipse.rdf4j.model.Value evaluate(TripleSource tripleSource,
                                               org.eclipse.rdf4j.model.Value... args)
                                        throws ValueExprEvaluationException

Evaluate the function over the supplied input arguments.

Parameters:

tripleSource - the TripleSource used in the query evaluation. This can be used to access the current state of the store.

args - the function input arguments.

Returns:

the function result value.

Throws:

ValueExprEvaluationException

Since:

3.3.0

mustReturnDifferentResult

default boolean mustReturnDifferentResult()

UUID() and STRUUID() must return a different result for each invocation.

Returns:

if each invocation must return a different result.