[jira] [Closed] (JEXL-359) Allow per-operator arithmetic handling of null arguments

["Henri Biestro (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JEXL-359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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