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

Class DoubleCast

java.lang.Object

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

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

All Implemented Interfaces:

Function

Direct Known Subclasses:

DoubleCast

public class DoubleCast
extends CastFunction

A Function that tries to cast its argument to an xsd:double.

Author:

Arjohn Kampman, Jeen Broekstra

Constructor Summary

Constructors

Constructor	Description
DoubleCast()

Method Summary

Modifier and Type	Method	Description
protected Literal	convert(ValueFactory valueFactory, Value value)	Convert the supplied value to a literal of the function output datatype.
protected CoreDatatype.XSD	getCoreXsdDatatype()
protected boolean	isValidForDatatype(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

evaluate, getURI, getXsdDatatype, getXsdName, typeError

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.function.Function

evaluate, mustReturnDifferentResult

Constructor Details

DoubleCast

public DoubleCast()

Method Details

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.

getCoreXsdDatatype

protected CoreDatatype.XSD getCoreXsdDatatype()

Specified by:

getCoreXsdDatatype in class CastFunction

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.