Class StringCast
java.lang.Object
org.eclipse.rdf4j.query.algebra.evaluation.function.xsd.CastFunction
org.eclipse.rdf4j.query.algebra.evaluation.function.xsd.StringCast
- All Implemented Interfaces:
Function
- Direct Known Subclasses:
StringCast
A
Function that tries to cast its argument to an
xsd:string.- Author:
- Arjohn Kampman, Jeen Broekstra
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected Literalconvert(ValueFactory valueFactory, Value value) Convert the supplied value to a literal of the function output datatype.evaluate(ValueFactory valueFactory, Value... args) Evaluate the function over the supplied input arguments, using the suppliedValueFactoryto produce the result.protected CoreDatatype.XSDprotected 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, getXsdDatatype, getXsdName, typeErrorMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.function.Function
evaluate, mustReturnDifferentResult
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Constructor Details
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StringCast
public StringCast()
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Method Details
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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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getCoreXsdDatatype
- Specified by:
getCoreXsdDatatypein classCastFunction
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isValidForDatatype
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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