[jira] [Commented] (ARIES-727) support syntax : ${a+b} in blueprint-cm

["Rex Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARIES-727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085000#comment-13085000 ] 

Rex Wang commented on ARIES-727:
--------------------------------

In ARIES-727-blueprint-cm.patch, I try to port David's codes from xbean to aries.
And it works for me. I have not committed it yet. Would be good if anyone could help review it. 
thanks

-Rex


> support syntax : ${a+b} in blueprint-cm 
> ----------------------------------------
>
>                 Key: ARIES-727
>                 URL: https://issues.apache.org/jira/browse/ARIES-727
>             Project: Aries
>          Issue Type: New Feature
>          Components: Blueprint
>    Affects Versions: blueprint-0.3.1, blueprint-0.4.0
>            Reporter: Rex Wang
>            Assignee: Rex Wang
>             Fix For: blueprint-0.4.0
>
>         Attachments: ARIES-727-blueprint-cm.patch
>
>
> I am wondering if Aries blueprint-cm support such scenario:
> <cm:property-placeholder id="property-placeholder" persistent-id="o.a.b.com" placeholder-prefix="${" placeholder-suffix="}">
>         <cm:default-properties>
>             <cm:property name="port" value="12345"/>
>             <cm:property name="offset" value="10"/>
>         </cm:default-properties>
> </cm:property-placeholder>
> <xxx:conn name="loc" uri="http://localhost:${port+offset}"/>
> I have a test, but seems the ${port+offset} can not be replaced with value "12355".
> -Rex
> -----------------------
> Hi Rex,
> to my knowledge (substantiated with a quick code inspection) the placeholders in Aries today support no operators or arithmetic like that. But please do raise an Improvement JIRA for the future :)
> Regards,
> Valentin
> -----------------------
> When we support this, we need to perform a 'plus' or string concatenate
> operation based on the variable type:).
> Therefore. when specifying the property in the blueprint xml, the explicit
> type should be specified if not string.
> Regards,
> Emily
> -----------------------
> I _think_ I wrote something like this for xbean-blueprint since it didn't look like blueprint supported it.  IIRC I used the same calculation engine as the geronimo config substitutions.  I think you can infer what kind of calculation to do (addition or concatenation) from the type of the property you end up setting.
> thanks
> david jencks

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