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https://issues.apache.org/jira/browse/JEXL-359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Biestro closed JEXL-359.
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> Allow per-operator arithmetic handling of null arguments
> --------------------------------------------------------
>
> Key: JEXL-359
> URL: https://issues.apache.org/jira/browse/JEXL-359
> Project: Commons JEXL
> Issue Type: Improvement
> Affects Versions: 3.2.1
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Priority: Major
> Fix For: 3.3
>
>
> WHAT
> A JexlArithmetic declares its behaviour with respect to null arguments using
> the strict flag. When strict, no operator is null-safe and each should
> consider a null argument as an error.
> It can not strictly be the case since '==' must be able to use null as
> argument.
> There are cases where one would like to retain 'strictness' for most
> operators but relax the behaviour for a few. A typical case is '+' for string
> and null where one would like to consider null as a valid argument even if
> arithmetic is strict.
> HOW
> There is already a scaffolding for this feature with the OperatorController.
> Refining it to associate the operator to a syntactic node allows controlling
> whether the interpretation of that node will tolerate null arguments before
> it is called.
> An overridable method in the JexlArithmetic to determine whether an operator
> is strict or null-safe exposes the intent (isStrict(JexlOperator)).
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