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 and Description
DoubleCast()

Method Summary

Modifier and Type	Method and Description
protected Literal	convert(ValueFactory valueFactory, Value value) Convert the supplied value to a literal of the function output datatype.
protected IRI	getXsdDatatype() Get the specific XML Schema datatype which this function returns.
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, getXsdName, typeError

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleCast

public DoubleCast()

Method Detail

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.