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https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391377#comment-16391377
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Andy Seaborne edited comment on JENA-1499 at 3/8/18 3:59 PM:
-------------------------------------------------------------
The other case is the default in-memory dataset ({{DatasetFactory.create()}}.
It's a one line change to {{DatasetGraphMap.listGraphNodes}} to make not reveal
empty graphs.
{{containsGraph}} already works - it looks for quads not for graph in the map.
(It could be slightly done as an override.)
JENA-1500 and PR#376 (which includes datasets tests including for here).
{noformat}
== plain
Contains: false
– listGraphNodes
(none)
– dump
(empty)
== general
Contains: true
– listGraphNodes
[http://example/g]
– dump
<[http://example/g]> {
}
{noformat}
With PR 374, TIM and TDB are the same as "plain".
was (Author: andy.seaborne):
The other case is the default in-memory dataset ({{DatasetFactory.create()}}.
It's a one line change to {{DatasetGraphMap.listGraphNodes}} to make not reveal
empty graphs.
{{containsGraph}} already works - it looks for quads not for graph in the map.
(It could be slightly done as an override.)
{nofomat}
== default
Contains: false
-- listGraphNodes
(none)
-- dump
(empty)
== general
Contains: true
-- listGraphNodes
http://example/g
-- dump
<http://example/g> {
}
{nofomat}
With PR 374, TIM and TDB are the same as "default".
> The TIM dataset retains a memory of named graphs after deleting all quads.
> --------------------------------------------------------------------------
>
> Key: JENA-1499
> URL: https://issues.apache.org/jira/browse/JENA-1499
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 3.6.0
> Reporter: Andy Seaborne
> Assignee: A. Soroka
> Priority: Minor
>
> Illustration:
> {noformat}
> DatasetGraph dsg = DatasetGraphFactory.createTxnMem();
> Quad q = SSE.parseQuad("(:g :s :p :o)");
> dsg.add(q);
> dsg.delete(q);
> Iter.print(dsg.listGraphNodes());
> {noformat}
> prints {{http://example/g}}.
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