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https://issues.apache.org/jira/browse/JENA-1402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16740821#comment-16740821
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Greg Albiston commented on JENA-1402:
-------------------------------------
I've had a quick look at _NodeValueDuration_ and where it is used in the ARQ
module.
In _XSDFuncOp,_ there are checks to get and set fields (i.e. year, month) which
aren't explicit on the _java.time.Duration_ as it only goes up to days.
Converting days to months and years consistently could be problematic without a
start date for context.
In _CastXSD,_ there are checks against the _xml.Duration_ fields for building
new durations of type _xdt:dayTimeDuration_ or _xdt:yearMonthDuration_ (these
aren't explicit in _java.time.Duration_). Same issue as above in distinguishing
when x days becomes y months.
In _NodeValueOps,_ there are operations using _XMLGregorianCalendar_ for which
_java.time.Duration_ doesn't have methods. _java.time.__LocalTime_ and
_java.time.__OffsetTime_ can be built from parsing the
_XMLGregorianCalendar.toString()_ but need to be selected based on whether
there is a TimeZone offset. _LocalTime/__OffsetTime_ could then be used to
operate on the _java.time.Duration._
So it could be quite difficult to swap to _java.time.Duration_ and retain the
XML Datatype functionality. Perhaps the extra classes or approach Bruno
mentioned might help.
> Subtracting two xsd:Duration gives incorrect results in SPARQL query
> --------------------------------------------------------------------
>
> Key: JENA-1402
> URL: https://issues.apache.org/jira/browse/JENA-1402
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 3.4.0
> Reporter: Greg Albiston
> Priority: Major
>
> There is an issue when subtracting two xsd:durations that include:
> * decimal seconds
> * non-zero minutes
> * second operand has a greater number of seconds than the first operand, i.e.
> the minutes are reduced.
> The result is a large number of minutes and incorrect seconds.
> For example:
> Integer, Larger: "PT2M3S" - "PT1M10S" = "PT0M53S" CORRECT
> Decimal, Smaller: "PT2M3.123S" - "PT1M1.123S" = "PT1M2.000S" CORRECT
> Decimal, Larger, Seconds: "PT0M3.123S" - "PT1M10.123S" = "-PT1M7.000S"
> CORRECT
> Decimal, Larger, Minutes: "PT2M3.123S" - "PT1M10.123S" = "PT883M0.020S"
> INCORRECT
> Decimal, Larger, Hours: "PT1H4M3.123S" - "PT0M10.123S" = "PT1H3883M0.020S"
> INCORRECT
> Example SPARQL:
> {code:sparql}
> SELECT ?res ?op1 ?op2
> WHERE{
> VALUES (?op1 ?op2) {
> ("PT2M3S"^^<http://www.w3.org/2001/XMLSchema#duration>
> "PT1M10S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT2M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration>
> "PT1M1.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT0M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration>
> "PT1M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT2M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration>
> "PT1M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> ("PT1H4M3.123S"^^<http://www.w3.org/2001/XMLSchema#duration>
> "PT0M10.123S"^^<http://www.w3.org/2001/XMLSchema#duration>)
> }
> BIND(?op1 - ?op2 AS ?res)
> }
> {code}
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