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 Summary

Constructors

Constructor and Description
StringCast()

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.
Literal	evaluate(ValueFactory valueFactory, Value... args) Evaluate the function over the supplied input arguments, using the supplied ValueFactory to produce the result.
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

getURI, 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

Constructor Detail

StringCast

public StringCast()

Method Detail

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.