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https://issues.apache.org/jira/browse/DAFFODIL-1964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Beckerle reassigned DAFFODIL-1964:
------------------------------------------
Assignee: Dave Thompson (was: Michael Beckerle)
> Unparsing ArrayCombinator assertion failure
> -------------------------------------------
>
> Key: DAFFODIL-1964
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1964
> Project: Daffodil
> Issue Type: Bug
> Components: Back End, Unparsing
> Affects Versions: 2.1.0
> Reporter: Steve Lawrence
> Assignee: Dave Thompson
> Priority: Major
> Fix For: 2.2.0
>
>
> A user reported an error when unparsing in the array combinator.
> The schema looks something like this:
> {code}
> ...
> <xs:sequence>
> <xs:element name="foo" ... />
> <xs:element name="bar" minOccurs="1" maxOccurs="6"
> dfdl:occursCountKind="implicit">
> <xs:complexType>
> <xs:sequence>
> <xs:annotation>
> <xs:appinfo source="http://www.ogf.org/dfdl/";>
> <dfdl:discriminator>{ expression }</dfdl:discriminator>
> </xs:appinfo>
> </xs:annotation>
> <xs:sequence dfdl:hiddenGroupRef="hiddenGrouPRef" />
> <xs:group ref="someGroupWithRequiredElement"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
> </xs:sequence>
> ...
> {code}
> With XML that looks like this:
> {code}
> <foo>...</foo>
> {code}
> So the bar element is an array that requires at least one instance, but the
> infoset has zero instances. Trying to unparse this resultsin the following:
> {code}
> org.apache.daffodil.exceptions.Abort: Invariant broken:
> event.isStart.&&(event.node.isInstanceOf[org.apache.daffodil.infoset.DIArray])
> org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:129)
> org.apache.daffodil.exceptions.Assert$.abort(Assert.scala:129)
> org.apache.daffodil.processors.unparsers.ArrayCombinatorUnparser.unparse(ElementKindUnparsers.scala:254)
> org.apache.daffodil.processors.unparsers.Unparser$class.unparse1(Unparser.scala:72)
> ...
> {code}
> The expected result is to return an UnaparseError about expecting a start
> array event but not getting one. I think the assertion just needs to be
> changed to an UnparseError, since there is clearly a case where the assertion
> doesn't hold.
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