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https://issues.apache.org/jira/browse/VALIDATOR-354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebb resolved VALIDATOR-354.
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Resolution: Abandoned
> VerhoeffCheckDigit.isValid("0") == true but .calculate("") fails
> ----------------------------------------------------------------
>
> Key: VALIDATOR-354
> URL: https://issues.apache.org/jira/browse/VALIDATOR-354
> Project: Commons Validator
> Issue Type: Bug
> Reporter: Sebb
> Priority: Minor
>
> VerhoeffCheckDigit.isValid("0") is true but .calculate("") fails.
> SInce isValid() includes the check digit that implies the empty string has a
> CD of "0". However calculate throws CDE when presented with the empty string.
> This is assymetric. I would expect to be able to redo the process to generate
> a code which is valid.
> Perhaps isValid() needs to return false if the original string is empty.
> One could just add a check for includesCheckDigit && length <= 1 but I wonder
> whether the algorithm could have a problem?
> Needs further research.
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