Package org.apache.commons.rdf.rdf4j.impl

Class LiteralImpl

java.lang.Object

org.apache.commons.rdf.rdf4j.impl.AbstractRDFTerm<org.eclipse.rdf4j.model.Literal>

org.apache.commons.rdf.rdf4j.impl.LiteralImpl

All Implemented Interfaces:

Literal, RDFTerm, RDF4JLiteral, RDF4JTerm

final class LiteralImpl
extends AbstractRDFTerm<org.eclipse.rdf4j.model.Literal>
implements RDF4JLiteral

Field Summary

Fields

Modifier and Type	Field	Description
private static java.lang.String	QUOTE

Fields inherited from class org.apache.commons.rdf.rdf4j.impl.AbstractRDFTerm

value

Constructor Summary

Constructors

Constructor	Description
LiteralImpl(org.eclipse.rdf4j.model.Literal literal)

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)	Check it this RDFTerm is equal to another RDFTerm.
IRI	getDatatype()	The IRI identifying the datatype that determines how the lexical form maps to a literal value.
java.util.Optional<java.lang.String>	getLanguageTag()	If and only if the datatype IRI is http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, the language tag for this Literal is a non-empty language tag as defined by BCP47. If the datatype IRI is not http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, this method must return Optional.empty().
java.lang.String	getLexicalForm()	The lexical form of this literal, represented by a Unicode string.
int	hashCode()	Calculate a hash code for this RDFTerm.
private static java.lang.String	lowerCase(java.lang.String langTag)
java.lang.String	ntriplesString()	Return the term serialised as specified by the RDF-1.1 N-Triples Canonical form.
java.lang.String	toString()

Methods inherited from class org.apache.commons.rdf.rdf4j.impl.AbstractRDFTerm

asValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.rdf.rdf4j.RDF4JTerm

asValue

Field Detail

QUOTE

private static final java.lang.String QUOTE

See Also:

Constant Field Values

Constructor Detail

LiteralImpl

LiteralImpl(org.eclipse.rdf4j.model.Literal literal)

Method Detail

lowerCase

private static java.lang.String lowerCase(java.lang.String langTag)

equals

public boolean equals(java.lang.Object obj)

Description copied from interface: RDFTerm

Check it this RDFTerm is equal to another RDFTerm.

If this object is an IRI, equality is checked using IRI.equals(Object), or if this object is a BlankNode, equality is checked using BlankNode.equals(Object), or if this object is a Literal, equality is checked using Literal.equals(Object).

Implementations MUST also override RDFTerm.hashCode() so that two equal Literals produce the same hash code.

Specified by:

equals in interface Literal

Specified by:

equals in interface RDFTerm

Overrides:

equals in class java.lang.Object

Parameters:

obj - Another object

Returns:

true if other is a RDFTerm and is equal to this

See Also:

IRI.equals(Object), BlankNode.equals(Object), Literal.equals(Object)

getDatatype

public IRI getDatatype()

Description copied from interface: Literal

The IRI identifying the datatype that determines how the lexical form maps to a literal value. If the datatype IRI is http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, Literal.getLanguageTag() must not return Optional.empty(), and it must return a valid BCP47 language tag.

Specified by:

getDatatype in interface Literal

Returns:

The datatype IRI for this literal.

See Also:

RDF-1.1 Literal datatype IRI

getLanguageTag

public java.util.Optional<java.lang.String> getLanguageTag()

Description copied from interface: Literal

If and only if the datatype IRI is http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, the language tag for this Literal is a non-empty language tag as defined by BCP47.
If the datatype IRI is not http://www.w3.org/1999/02/22-rdf-syntax-ns#langString, this method must return Optional.empty().

The value space of language tags is always in lower case; although RDF implementations MAY convert all language tags to lower case, safe comparisons of language tags should be done using String.toLowerCase(Locale) with the locale Locale.ROOT.

Implementation note: If your application requires Serializable objects, it is best not to store an Optional in a field. It is recommended to use Optional.ofNullable(Object) to create the return value for this method.

Specified by:

getLanguageTag in interface Literal

Returns:

The Optional language tag for this literal. If Optional.isPresent() returns true, the value returned by Optional.get() must be a non-empty language tag string conforming to BCP47.

See Also:

RDF-1.1 Literal language tag

getLexicalForm

public java.lang.String getLexicalForm()

Description copied from interface: Literal

The lexical form of this literal, represented by a Unicode string.

Specified by:

getLexicalForm in interface Literal

Returns:

The lexical form of this literal.

See Also:

RDF-1.1 Literal lexical form

hashCode

public int hashCode()

Description copied from interface: RDFTerm

Calculate a hash code for this RDFTerm.

As an RDFTerm is immutable, this method will always return the same hashCode over the lifetime of this object.

This method MUST be implemented in conjunction with RDFTerm.equals(Object) so that two equal RDFTerm produce the same hash code.

Specified by:

hashCode in interface Literal

Specified by:

hashCode in interface RDFTerm

Overrides:

hashCode in class java.lang.Object

Returns:

a hash code value for this RDFTerm.

See Also:

IRI.hashCode(), Literal.hashCode(), BlankNode.hashCode()

ntriplesString

public java.lang.String ntriplesString()

Description copied from interface: RDFTerm

Return the term serialised as specified by the RDF-1.1 N-Triples Canonical form.

Specified by:

ntriplesString in interface RDFTerm

Returns:

The term serialised as RDF-1.1 N-Triples.

See Also:

RDF-1.1 N-Triples Canonical form

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object