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https://issues.apache.org/jira/browse/JEXL-250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Biestro closed JEXL-250.
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> Safe navigation operator
> ------------------------
>
> Key: JEXL-250
> URL: https://issues.apache.org/jira/browse/JEXL-250
> Project: Commons JEXL
> Issue Type: New Feature
> Affects Versions: 3.1
> Reporter: Dmitri Blinov
> Assignee: Henri Biestro
> Priority: Minor
> Fix For: 3.2
>
>
> It would be more convenient for a script writer to have a kind of safe
> navigation operator, in the form of, for example, ({{object?.property),}} for
> null pointer dereferences. I think its quite a common feature of many
> scripting (and compiled languages) now. The safe operator should work like
> basic navigation operator for non null values and should short-circuit the
> entire expression evaluation after encountering null value.
> I see the difference of new operator from the existing lenient mode
> evaluation in ability to explicitly define places in an expression where
> {{null}} deference is allowed, for example the expression
> {code}Order.Customer?.Name{code} defines that each {{Order}} should have a
> {{Customer}} and only the {{Name}} of the {{Customer}} is optional.
> The difference of new operator from the existing null coalescing {{??}}
> operator is in its ability to short-circuit evaluation.
> So, safe navigation operator would be a helpful syntaxic sugar which in my
> opinion does not overlap with an existing functionality.
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