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http://issues.apache.org/jira/browse/VELOCITY-496?page=comments#action_12450770
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Claude Brisson commented on VELOCITY-496:
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IMHO the ${map.{foo.bar}.baz}schmoo syntax is precise but may a bit complex for
template writers so I think we should support the easier version where two
successive identifiers can be merged.
Anyhow, I don't feel like digging into the parser for now... It doesn't prevent
someone else to give it a try to implement Christoph's idea.
So I followed the track of $a.b.c checking for $a.get("b.c") if $a.b is null.
The proposed patch does it as follow: when an ASTIdentifier is followed by
another ASTIdentifier, the execute( ) method of the first one checks an
alternate merged identifier whenever the natural identifier doesn't give any
result. A new TemplateTestCase is provided.
> Allow periods in references secondary keys.
> -------------------------------------------
>
> Key: VELOCITY-496
> URL: http://issues.apache.org/jira/browse/VELOCITY-496
> Project: Velocity
> Issue Type: Improvement
> Components: Engine
> Affects Versions: 1.6
> Reporter: Claude Brisson
> Priority: Minor
> Attachments: identifiers-merging.patch
>
>
> This is a quite prospective proposal that emerged from a discussion in a
> VelocityTools JIRA issue (https://issues.apache.org/jira/browse/VELTOOLS-69).
> Its goal is to have the short syntax $map.foo.bar chek the existence of
> $map.get("foo.bar") when $map.foo is null.
> Backward compatibility is 99%, since it only breaks templates that rely on
> $map.foo.bar being an invalid reference while having foo.bar as key in map.
> The implementation doesn't look obvious, and we must ensure that there are no
> other side effects, yet this behaviour can be quite usefull when dealing with
> HTML field names that contain a period.
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