Class LexicalValueComparator

java.lang.Object

org.eclipse.rdf4j.model.util.LexicalValueComparator

All Implemented Interfaces:

Serializable, Comparator<Value>

public class LexicalValueComparator
extends Object
implements Serializable, Comparator<Value>

A lexical RDF Term Comparator, this class does not compare numerically and is therefore a bit faster than a SPARQL compliant comparator.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
LexicalValueComparator()

Method Summary

Modifier and Type	Method	Description
int	compare(Value o1, Value o2)
private int	compareBNodes(BNode leftBNode, BNode rightBNode)
private int	compareDatatypes(IRI leftDatatype, IRI rightDatatype)	Compares two literal datatypes and indicates if one should be ordered after the other.
private int	compareDatatypes(XSD.Datatype leftDatatype, XSD.Datatype rightDatatype)
private int	compareLiterals(Literal leftLit, Literal rightLit)
private int	compareTriples(Triple leftTriple, Triple rightTriple)
private int	compareURIs(IRI leftURI, IRI rightURI)

Methods inherited from class Object

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

Methods inherited from interface Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

Constructor Details

LexicalValueComparator

public LexicalValueComparator()

Method Details

compare

public int compare(Value o1,
 Value o2)

Specified by:

compare in interface Comparator<Value>

compareBNodes

private int compareBNodes(BNode leftBNode,
 BNode rightBNode)

compareURIs

private int compareURIs(IRI leftURI,
 IRI rightURI)

compareLiterals

private int compareLiterals(Literal leftLit,
 Literal rightLit)

compareDatatypes

private int compareDatatypes(IRI leftDatatype,
 IRI rightDatatype)

Compares two literal datatypes and indicates if one should be ordered after the other. This algorithm ensures that compatible ordered datatypes (numeric and date/time) are grouped together so that

invalid reference

QueryEvaluationUtil#compareLiterals(Literal, Literal, CompareOp)

is used in consecutive ordering steps.

compareDatatypes

private int compareDatatypes(XSD.Datatype leftDatatype,
 XSD.Datatype rightDatatype)

compareTriples

private int compareTriples(Triple leftTriple,
 Triple rightTriple)