[jira] [Closed] (JENA-1362) SPARQL updates parser produces UpdateRequest which cannot be parsed again

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne closed JENA-1362.
-------------------------------

> SPARQL updates parser produces UpdateRequest which cannot be parsed again
> -------------------------------------------------------------------------
>
>                 Key: JENA-1362
>                 URL: https://issues.apache.org/jira/browse/JENA-1362
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: ARQ, Jena
>    Affects Versions: Jena 3.1.1
>         Environment: Windows / Linux
>            Reporter: Michal Wozniak
>            Priority: Minor
>
> *Issue*: for SPARQL updates containing a list in WHERE clause, UpdateFactory.create() produces UpdateRequest which cannot be parsed again.
> *Investigation*: the following SPARQL update:
> INSERT {
>   ?label skosxl:literalForm ?labelLiteralPart .
> }
> WHERE
> {
>   ?label skosxl:literalForm ?labelLiteral .
>   ?labelLiteralPart spif:split (?labelLiteral \" \" )
> };
> is transformed after UpdateFactory.create().toString() into (which is not a valid SPARQL string):
> INSERT {
>   ?label skosxl:literalForm ?labelLiteralPart .
> }
> WHERE { 
>     ?label    skosxl:literalForm  ?labelLiteral .
>     ?labelLiteralPart spif:split          ??0 .
>     ??0       rdf:first           ?labelLiteral ;
>                  rdf:rest            ??1 .
>     ??1       rdf:first           " " ;
>                  rdf:rest            rdf:nil
>   }
> *Note*: the same issue does not happen for SPARQL queries. For a query, the parsed WHERE clause:
> WHERE{ 
>     ?label    skosxl:literalForm  ?labelLiteral .
>     ?labelLiteralPart spif:split          _:b0 .
>     _:b0      rdf:first           ?labelLiteral ;
>                   rdf:rest            _:b1 .
>     _:b1      rdf:first           " " ;
>                   rdf:rest            rdf:nil
>   }
> *Motivation*: we parse UpdateRequest for two reasons: (1) add USING and WITH clauses to indicate target graph, (2) check validity of SPARQL update itself, getting parser's details, such as line and column in case of a parsingerror. Then, we send it as a string parameter to TBL which executes it in: org.topbraidlive.sparql.servlet.UpdateHandler. Thus, in this flow, each update SPARQL is parsed, serialized and parsed again.



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