Class QuadImpl
- java.lang.Object
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- org.apache.commons.rdf.rdf4j.impl.QuadImpl
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- All Implemented Interfaces:
Quad
,QuadLike<BlankNodeOrIRI>
,TripleLike
,RDF4JQuad
,RDF4JTripleLike
final class QuadImpl extends java.lang.Object implements RDF4JQuad
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Constructor Summary
Constructors Constructor Description QuadImpl(org.eclipse.rdf4j.model.Statement statement, java.util.UUID salt)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description org.eclipse.rdf4j.model.Statement
asStatement()
Return the corresponding RDF4JStatement
.Triple
asTriple()
Adapt this Quad to a Triple.boolean
equals(java.lang.Object obj)
Check it this Quad is equal to another Quad.java.util.Optional<BlankNodeOrIRI>
getGraphName()
The graph name (graph label) of this quad, if present.RDFTerm
getObject()
IRI
getPredicate()
The predicateIRI
of this quad.BlankNodeOrIRI
getSubject()
The subject of this quad, which may be either aBlankNode
or anIRI
, which are represented in Commons RDF by the interfaceBlankNodeOrIRI
.int
hashCode()
Calculate a hash code for this Quad.java.lang.String
toString()
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Method Detail
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asStatement
public org.eclipse.rdf4j.model.Statement asStatement()
Description copied from interface:RDF4JTripleLike
Return the corresponding RDF4JStatement
.- Specified by:
asStatement
in interfaceRDF4JTripleLike
- Returns:
- The corresponding RDF4J Statement.
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asTriple
public Triple asTriple()
Description copied from interface:Quad
Adapt this Quad to a Triple.The returned
Triple
will have equivalent values returned from the methodsTripleLike.getSubject()
,TripleLike.getPredicate()
andTripleLike.getObject()
.The returned
Triple
MUST NOT beQuad.equals(Object)
to thisQuad
, even if this quad has a default graphQuad.getGraphName()
value ofOptional.empty()
, but MUST follow theTriple.equals(Object)
semantics. This means that the following MUST be true:Quad q1, q2; if (q1.equals(q2)) { assert (q1.asTriple().equals(q2.asTriple())); } else if (q1.asTriple().equals(q2.asTriple())) { assert (q1.getSubject().equals(q2.getSubject())); assert (q1.getPredicate().equals(q2.getPredicate())); assert (q1.getObject().equals(q2.getObject())); assert (!q1.getGraphName().equals(q2.getGraphName())); }
Thedefault
implementation of this method return a proxyTriple
instance that keeps a reference to thisQuad
to call the underlyingTripleLike
methods, but supplies aTriple
compatible implementation ofTriple.equals(Object)
andTriple.hashCode()
. Implementations may override this method, e.g. for a more efficient solution.- Specified by:
asTriple
in interfaceQuad
- Returns:
- A
Triple
that contains the sameTripleLike
properties as this Quad.
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equals
public boolean equals(java.lang.Object obj)
Description copied from interface:Quad
Check it this Quad is equal to another Quad.Two Quads are equal if and only if their
Quad.getGraphName()
,Quad.getSubject()
,Quad.getPredicate()
andQuad.getObject()
are equal.Implementations MUST also override
Quad.hashCode()
so that two equal Quads produce the same hash code.Note that a
Quad
MUST NOT be equal to aTriple
, even if this Quad'sQuad.getGraphName()
isOptional.empty()
. To test triple-like equivalence, callers can use:Quad q1; Triple t2; q1.asTriple().equals(t2));
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getGraphName
public java.util.Optional<BlankNodeOrIRI> getGraphName()
Description copied from interface:Quad
The graph name (graph label) of this quad, if present. IfOptional.isPresent()
, then theOptional.get()
is either aBlankNode
or anIRI
, indicating the graph name of this Quad. If the graph name is not present, e.g. the value isOptional.empty()
, it indicates that this Quad is in the default graph.- Specified by:
getGraphName
in interfaceQuad
- Specified by:
getGraphName
in interfaceQuadLike<BlankNodeOrIRI>
- Returns:
- If
Optional.isPresent()
, the graph nameBlankNodeOrIRI
of this quad, otherwiseOptional.empty()
, indicating the default graph. - See Also:
- RDF- 1.1 Dataset
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getObject
public RDFTerm getObject()
Description copied from interface:Quad
The object of this quad, which may be either aBlankNode
, anIRI
, or aLiteral
, which are represented in Commons RDF by the interfaceRDFTerm
.- Specified by:
getObject
in interfaceQuad
- Specified by:
getObject
in interfaceTripleLike
- Returns:
- The object
RDFTerm
of this quad. - See Also:
- RDF-1.1 Triple object
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getPredicate
public IRI getPredicate()
Description copied from interface:Quad
The predicateIRI
of this quad.- Specified by:
getPredicate
in interfaceQuad
- Specified by:
getPredicate
in interfaceTripleLike
- Returns:
- The predicate
IRI
of this quad. - See Also:
- RDF-1.1 Triple predicate
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getSubject
public BlankNodeOrIRI getSubject()
Description copied from interface:Quad
The subject of this quad, which may be either aBlankNode
or anIRI
, which are represented in Commons RDF by the interfaceBlankNodeOrIRI
.- Specified by:
getSubject
in interfaceQuad
- Specified by:
getSubject
in interfaceTripleLike
- Returns:
- The subject
BlankNodeOrIRI
of this quad. - See Also:
- RDF-1.1 Triple subject
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hashCode
public int hashCode()
Description copied from interface:Quad
Calculate a hash code for this Quad.The returned hash code MUST be equal to the result of
Objects.hash(Object...)
with the argumentsQuad.getSubject()
,Quad.getPredicate()
,Quad.getObject()
,Quad.getGraphName()
.This method MUST be implemented in conjunction with
Quad.equals(Object)
so that two equalQuad
s produce the same hash code.
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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