Package com.apicatalog.rdf.model

Interface RdfTerm

All Known Subinterfaces:

RdfLiteral, RdfQuad, RdfResource, RdfTriple

All Known Implementing Classes:

LangString, Literal, Quad, Resource, Triple

public interface RdfTerm

Represents the value of an RDF statement.

An RdfTerm can be one of the following:

• An absolute IRI or a blank node identifier (RdfResource)
• An RDF literal (RdfLiteral)
• An RDF triple, representing RDF-star (RDF 1.2) embedded triples (RdfTriple)

This interface provides type-checking methods to determine the specific kind of RDF term, as well as casting methods that allow safe access to the underlying representation.

See Also:

RDF 1.1 Term, RDF 1.2 (RDF-star)

Method Summary

Modifier and Type	Method	Description
default RdfLiteral	asLiteral()	Returns this term as an RdfLiteral.
default RdfResource	asResource()	Returns this term as an RdfResource.
default RdfTriple	asTriple()	Returns this term as an RdfTriple.
boolean	equals(java.lang.Object o)	Compares this RDF term to the specified object.
int	hashCode()	Returns a hash code value for this RDF term.
default boolean	isLiteral()	Indicates whether this term is an RDF literal.
default boolean	isResource()	Indicates whether this term is a resource, which includes absolute IRIs and blank node identifiers.
default boolean	isTriple()	Indicates whether this term is an RDF triple.
java.lang.String	toString()	Returns a string representation of this RDF term.

Method Detail

isLiteral

default boolean isLiteral()

Indicates whether this term is an RDF literal.

Returns:

true if the term is an RdfLiteral; false otherwise.

isResource

default boolean isResource()

Indicates whether this term is a resource, which includes absolute IRIs and blank node identifiers.

Returns:

true if the term is an RdfResource; false otherwise.

isTriple

default boolean isTriple()

Indicates whether this term is an RDF triple.

RDF triples are supported for RDF-star (RDF 1.2) compatibility.

Returns:

true if the term is an RdfTriple; false otherwise.

asLiteral

default RdfLiteral asLiteral()

Returns this term as an RdfLiteral.

Returns:

the RdfLiteral representation of this term.

Throws:

java.lang.ClassCastException - if this term is not an RdfLiteral.

asResource

default RdfResource asResource()

Returns this term as an RdfResource.

Returns:

the RdfResource representation of this term.

Throws:

java.lang.ClassCastException - if this term is not an RdfResource.

asTriple

default RdfTriple asTriple()

Returns this term as an RdfTriple.

Returns:

the RdfTriple representation of this term.

Throws:

java.lang.ClassCastException - if this term is not an RdfTriple.

equals

boolean equals(java.lang.Object o)

Compares this RDF term to the specified object. Implementations must override this method to provide equality checks appropriate to the term type.

Overrides:

equals in class java.lang.Object

Parameters:

o - the object to compare with this term.

Returns:

true if the specified object is equal to this term; false otherwise.

hashCode

int hashCode()

Returns a hash code value for this RDF term.

Overrides:

hashCode in class java.lang.Object

Returns:

a hash code consistent with equals(Object).

toString

java.lang.String toString()

Returns a string representation of this RDF term.

Overrides:

toString in class java.lang.Object

Returns:

a string describing this RDF term.