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

Class BlankNodeImpl

java.lang.Object

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

org.apache.commons.rdf.rdf4j.impl.BlankNodeImpl

All Implemented Interfaces:

BlankNode, BlankNodeOrIRI, RDFTerm, RDF4JBlankNode, RDF4JBlankNodeOrIRI, RDF4JTerm

final class BlankNodeImpl
extends AbstractRDFTerm<org.eclipse.rdf4j.model.BNode>
implements RDF4JBlankNode

Field Summary

Fields

Modifier and Type	Field	Description
private int	hashCode
private long	saltUUIDleast
private long	saltUUIDmost

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

value

Constructor Summary

Constructors

Constructor	Description
BlankNodeImpl(org.eclipse.rdf4j.model.BNode bNode, java.util.UUID salt)

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)	Check it this RDFTerm is equal to another RDFTerm.
int	hashCode()	Calculate a hash code for this RDFTerm.
private boolean	isValidBlankNodeLabel(java.lang.String id)
java.lang.String	ntriplesString()	Return the term serialised as specified by the RDF-1.1 N-Triples Canonical form.
java.lang.String	toString()
java.lang.String	uniqueReference()	Return a reference for uniquely identifying the blank node.

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.RDF4JBlankNode

asValue

Field Detail

hashCode

private transient int hashCode

saltUUIDleast

private final long saltUUIDleast

saltUUIDmost

private final long saltUUIDmost

Constructor Detail

BlankNodeImpl

BlankNodeImpl(org.eclipse.rdf4j.model.BNode bNode,
              java.util.UUID salt)

Method Detail

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 BlankNode

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)

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 BlankNode

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()

isValidBlankNodeLabel

private boolean isValidBlankNodeLabel(java.lang.String id)

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

uniqueReference

public java.lang.String uniqueReference()

Description copied from interface: BlankNode

Return a reference for uniquely identifying the blank node.

The reference string MUST universally and uniquely identify this blank node. That is, different blank nodes created separately in different JVMs or from different RDF instances MUST NOT have the same reference string.

The BlankNode.uniqueReference() of two BlankNode instances MUST be equal if and only if the two blank nodes are equal according to BlankNode.equals(Object).

Clients should not assume any particular structure of the reference string, however it is recommended that the reference string contain a UUID-derived string, e.g. as returned from UUID.toString().

IMPORTANT: This is not a blank node identifier nor a serialization/syntax label, and there are no guarantees that it is a valid identifier in any concrete RDF syntax. For an N-Triples compatible identifier, use RDFTerm.ntriplesString().

Specified by:

uniqueReference in interface BlankNode

Returns:

A universally unique reference to identify this BlankNode

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object