[
https://issues.apache.org/jira/browse/JEXL-113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063545#comment-13063545
]
Henri Biestro commented on JEXL-113:
------------------------------------
Hi Max,
I've added JexlEngine.getVariables() to the trunk (revision 1145359).
Let me know if this is what you expected.
Cheers
Henrib
> Need a function to extract which variables are used to evaluate a script
> (was: Dot notation behaves unexpectedly with null values)
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: JEXL-113
> URL: https://issues.apache.org/jira/browse/JEXL-113
> Project: Commons JEXL
> Issue Type: Sub-task
> Affects Versions: 2.0.1
> Environment: JDK 1.6
> Reporter: Max Tardiveau
> Assignee: Henri Biestro
>
> When a variable of the form a.b is evaluated, the context is asked first for
> the value of a. That value is then asked for the value of b.
> So far, so good: this is exactly what you'd expect from the dot operator.
> But if the value of b is null, the context is then asked for the value of
> a.b, in other words the dot operator is ignored and "a.b" is considered to be
> a single variable.
> This is at best confusing. Granted, this can be avoided with the a['b']
> notation, but that's clumsy.
> I assume this is an attempt to support both the dot operator and ant-style
> variables. I don't think you can have both and remain sane.
> Suggestion: either document this behavior, or make it an option. My vote
> would be to just use the value returned, even if it's null. Either dot is an
> operator, or it's not. Perhaps make that configurable?
> Thanks!
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
