[jira] [Created] (DAFFODIL-2056) Implicit expression conversion from xs:string to xs:hexBinary causes exception

["Steve Lawrence (JIRA)" <ji...@apache.org>]

Steve Lawrence created DAFFODIL-2056:
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             Summary: Implicit expression conversion from xs:string to xs:hexBinary causes exception
                 Key: DAFFODIL-2056
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2056
             Project: Daffodil
          Issue Type: Bug
          Components: Front End
    Affects Versions: 2.2.0
            Reporter: Steve Lawrence


Assume the following schema snippet:
{code:xml}
<xs:element name="xs:hexBinary" type="xs:hexBinary" dfdl:inputValueCalc="{ xs:string('DEADBEEF') }" />
{code}
As of Daffodil 2.3.0, we allow implicit conversions between the result of an expression and the expected type. So this should insert an implicit conversion from xs:string (the resulting type) to xs:hexBinary (the expected type). But this results in the following exception: 
{code}
java.lang.ClassCastException: org.apache.daffodil.dpath.XSHexBinary$ cannot be cast to org.apache.daffodil.dpath.RecipeOp
	at org.apache.daffodil.dpath.Conversion$.conversionOps(Conversions.scala:147)
	at org.apache.daffodil.dpath.Expression.conversions$lzycompute(Expression.scala:120)
	at org.apache.daffodil.dpath.Expression.conversions(Expression.scala:117)
	at org.apache.daffodil.dpath.FNOneArgExpr.compiledDPath$lzycompute(Expression.scala:1869)
	at org.apache.daffodil.dpath.FNOneArgExpr.compiledDPath(Expression.scala:1865)
	at org.apache.daffodil.dpath.FunctionCallExpression.compiledDPath$lzycompute(Expression.scala:1317)
	at org.apache.daffodil.dpath.FunctionCallExpression.compiledDPath(Expression.scala:1317)
	at org.apache.daffodil.dpath.WholeExpression.compiledDPath$lzycompute(Expression.scala:636)
	at org.apache.daffodil.dpath.WholeExpression.compiledDPath(Expression.scala:636)
	at org.apache.daffodil.dpath.DFDLPathExpressionParser.compile(DFDLExpressionParser.scala:54)
{code}
Eventually this implicit conversion will be disabled, but since it is allowed we should fix this.

The workaround is to be explicit about the conversion, e.g.:
{code:xml}
<xs:element name="xs:hexBinary" type="xs:hexBinary" dfdl:inputValueCalc="{ xs:hexBinary(xs:string('DEADBEEF')) }" />
{code}



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