Class StringCast
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.evaluation.function.xsd.CastFunction
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- org.eclipse.rdf4j.query.algebra.evaluation.function.xsd.StringCast
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- All Implemented Interfaces:
Function
- Direct Known Subclasses:
StringCast
public class StringCast extends CastFunction
AFunctionthat tries to cast its argument to an xsd:string.- Author:
- Arjohn Kampman, Jeen Broekstra
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Constructor Summary
Constructors Constructor Description StringCast()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Literalconvert(ValueFactory valueFactory, Value value)Convert the supplied value to a literal of the function output datatype.Literalevaluate(ValueFactory valueFactory, Value... args)Evaluate the function over the supplied input arguments, using the suppliedValueFactoryto produce the result.protected IRIgetXsdDatatype()Get the specific XML Schema datatype which this function returns.protected booleanisValidForDatatype(String lexicalValue)Verifies that the supplied lexical value is valid for the datatype.-
Methods inherited from class org.eclipse.rdf4j.query.algebra.evaluation.function.xsd.CastFunction
getURI, getXsdName, typeError
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.function.Function
evaluate, mustReturnDifferentResult
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Method Detail
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evaluate
public Literal evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException
Description copied from interface:FunctionEvaluate the function over the supplied input arguments, using the suppliedValueFactoryto produce the result.- Specified by:
evaluatein interfaceFunction- Overrides:
evaluatein classCastFunction- Parameters:
valueFactory- aValueFactoryto use for producing the function result.args- the function input arguments.- Returns:
- the function result value.
- Throws:
ValueExprEvaluationException
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convert
protected Literal convert(ValueFactory valueFactory, Value value) throws ValueExprEvaluationException
Description copied from class:CastFunctionConvert the supplied value to a literal of the function output datatype.- Specified by:
convertin classCastFunction- Parameters:
valueFactory- the valueFactory to usevalue- a value that is not a string-typed literal, and not a literal of the same datatype as the function output datatype.- Returns:
- a literal value of the function output datatype
- Throws:
ValueExprEvaluationException- if an error occurs in conversion.
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getXsdDatatype
protected IRI getXsdDatatype()
Description copied from class:CastFunctionGet the specific XML Schema datatype which this function returns.- Specified by:
getXsdDatatypein classCastFunction- Returns:
- an XML Schema datatype IRI
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isValidForDatatype
protected boolean isValidForDatatype(String lexicalValue)
Description copied from class:CastFunctionVerifies that the supplied lexical value is valid for the datatype.- Specified by:
isValidForDatatypein classCastFunction- Parameters:
lexicalValue- a lexical value- Returns:
- true if the lexical value is valid for the datatype, false otherwise.
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