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

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
public class StringCast extends CastFunction
A Function that tries to cast its argument to an xsd:string.
Author:
Arjohn Kampman, Jeen Broekstra

  • Constructor Details

    • StringCast

      public StringCast()

  • Method Details

    • evaluate

      public Literal evaluate​(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException
      Description copied from interface: Function
      Evaluate the function over the supplied input arguments, using the supplied ValueFactory to produce the result.
      Specified by:
      evaluate in interface Function
      Overrides:
      evaluate in class CastFunction
      Parameters:
      valueFactory - a ValueFactory to use for producing the function result.
      args - the function input arguments.
      Returns:
      the function result value.
      Throws:
      ValueExprEvaluationException

    • convert

      protected Literal convert​(ValueFactory valueFactory, Value value) throws ValueExprEvaluationException
      Description copied from class: CastFunction
      Convert the supplied value to a literal of the function output datatype.
      Specified by:
      convert in class CastFunction
      Parameters:
      valueFactory - the valueFactory to use
      value - 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.

    • getXsdDatatype

      protected IRI getXsdDatatype()
      Description copied from class: CastFunction
      Get the specific XML Schema datatype which this function returns.
      Specified by:
      getXsdDatatype in class CastFunction
      Returns:
      an XML Schema datatype IRI

    • isValidForDatatype

      protected boolean isValidForDatatype​(String lexicalValue)
      Description copied from class: CastFunction
      Verifies that the supplied lexical value is valid for the datatype.
      Specified by:
      isValidForDatatype in class CastFunction
      Parameters:
      lexicalValue - a lexical value
      Returns:
      true if the lexical value is valid for the datatype, false otherwise.