support syntax : ${a+b} in blueprint-cm
----------------------------------------
Key: ARIES-727
URL: https://issues.apache.org/jira/browse/ARIES-727
Project: Aries
Issue Type: New Feature
Components: Blueprint
Affects Versions: blueprint-0.3.1, blueprint-0.4.0
Reporter: Rex Wang
Assignee: Rex Wang
Fix For: blueprint-0.4.0
I am wondering if Aries blueprint-cm support such scenario:
<cm:property-placeholder id="property-placeholder" persistent-id="o.a.b.com"
placeholder-prefix="${" 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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