Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/19
@afs I've updated the quad javadocs to clarify my view:
http://stain.github.io/incubator-commonsrdf/quad/org/apache/commons/rdf/api/Quad.html#equals-java.lang.Object-
says:
> Two Quads are equal if and only if their getGraphName(), getSubject(),
getPredicate() and getObject() are equal.
> Implementations MUST also override hashCode() so that two equal Quads
produce the same hash code.
> Note that a Quad MUST NOT be equal to a Triple, even if this Quad's
getGraphName() is Optional.empty(). To test triple-like equivalence, callers
can use:
```java
Quad q1;
Triple t2;
q1.asTriple().equals(t2));
```
The last statement means that `Triple` don't need to support the inverse
`.equals(Quad)` and if someone really wanted to do `Quad extends Triple` then
they would need to have a boolean isQuad; or similar to know which semantics to
use in its `.equals()` (just as if they wanted to implement both Literal and
IRI).
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