[jboss-jira] [JBoss JIRA] (DROOLS-1551) Implement FEEL/DMN value marshaller

[Edson Tirelli (JIRA)]

Edson Tirelli created DROOLS-1551:
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             Summary: Implement FEEL/DMN value marshaller
                 Key: DROOLS-1551
                 URL: https://issues.jboss.org/browse/DROOLS-1551
             Project: Drools
          Issue Type: Feature Request
          Components: dmn engine
    Affects Versions: 7.0.0.CR3
            Reporter: Edson Tirelli
            Assignee: Edson Tirelli
             Fix For: 7.1.0.Final


Some value types in FEEL/DMN require special formatting when marshalling/unmarshalling. For instance:

{quote}
   So it seems that ISO 8601 does not define negative intervals. I.e., ISO 8601 only supports things like "PT1H". XPath extends that with a leading optional sign, like "+PT1H" and "-PT1H". Java extends that allowing the sign to be used in each of the units in the duration like, "PT+1H", "PT-1H", besides the leading sign "-PT1H".

   The FEEL spec on page 113 seems to follow the XPath lexical definition, so the leading sign "-PT1H" seems to be the correct format.
{quote}

Implement an object marshaller for DMN/FEEL that is capable of marshalling/unmarshalling objects. Most object types are straightforward, but a few of them (like durations) need special handling. In particular:

* negative duration should use a leading - sign instead of having the sign in the unit numbers
* durations need to be normalized before marshalled:

{quote}
A days and time duration in the semantic domain is a sequence of numbers for the days, hours, minutes, and seconds of duration, normalized such that the sum of these numbers is minimized.
{quote}




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