Steve Lawrence created DAFFODIL-2839:
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Summary: Case from xs:double or xs:float to xs:unsignedLong fails
with ClassCastException error
Key: DAFFODIL-2839
URL: https://issues.apache.org/jira/browse/DAFFODIL-2839
Project: Daffodil
Issue Type: Bug
Components: Front End
Reporter: Steve Lawrence
The following schema parses a double and then has an expression to convert that
double to an unsignedLong:
{code:xml}
<element name="root">
<complexType>
<sequence>
<element name="double" type="xs:double" />
<element name="ulong" type="xs:unsignedLong" dfdl:inputValueCalc="{
xs:unsignedLong(../double) }" />
</sequence>
</complexType>
</element>
{code}
This fails with the exception:
{code}
rg.apache.daffodil.lib.exceptions.Abort: Invariant broken. Runtime.scala -
Leaked exception: java.lang.ClassCastException: java.math.BigInteger cannot be
cast to java.lang.Long
java.lang.ClassCastException: java.math.BigInteger cannot be cast to
java.lang.Long
at
org.apache.daffodil.runtime1.infoset.DataValue$.getLong$extension(DataValue.scala:91)
at
org.apache.daffodil.runtime1.dpath.LongToUnsignedLong$.computeValue(ConverterOps.scala:219)
at
org.apache.daffodil.runtime1.dpath.LongToUnsignedLong$.computeValue(ConverterOps.scala:217)
at
org.apache.daffodil.runtime1.dpath.Converter.run(DPathRuntime.scala:311)
at
org.apache.daffodil.runtime1.dpath.CompiledDPath.run(DPathRuntime.scala:148)
at
org.apache.daffodil.runtime1.dpath.CompiledDPath.runExpression(DPathRuntime.scala:73)
at
org.apache.daffodil.runtime1.dpath.RuntimeExpressionDPath.evaluateExpression(DPath.scala:283)
at
org.apache.daffodil.runtime1.dpath.RuntimeExpressionDPath.evaluateMaybe(DPath.scala:294)
at
org.apache.daffodil.runtime1.dpath.RuntimeExpressionDPath.evaluate(DPath.scala:307)
{code}
It seems like our expression compiler first converts the double to a long and
then converts the long to an unsigned long, failing with the latter. Note that
this is probably incorrect, since converting from a double to long first will
limit the value to maxLong which it should not do.
A sortof workaround is to change the expression to this:
{code}
xs:unsignedLong(xs:long(../double))
{code}
So we explicitly cast the double to a long, and then cast the long to the
unsigned long. This still limits the range to maxLong, but does allow the
conversion to succeed as expected as long as the double is in the range of 0 to
maxLong.
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