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From "Dalton, Tom" <tdal...@hp.com>
Subject Dereferencing property files
Date Tue, 01 Dec 2009 12:04:30 GMT
Hi,

I have a property file with an entries like:
atk-1.26.0.exported.base.dir=/path/to/atk/1.26.0
atk-1.27.0.exported.base.dir=/path/to/atk/1.27.0

In my build file I want to be able to refer to this property with a version-independent name
like "atk.base.dir"

I load the property file, to get the properties "atk-1.2x.0.exported.base.dir"
I set another property "atk.version" to a value of "1.26.0"

How do I combine these to get the new property "atk.base.dir".

E.g. I want to double dereference a property:

<loadproperties srcFile="/path/to/my/atk/exported.properties"/>
<echo>atk-1.26.0.exported.base.dir</echo><!-- works ok -->
<echo>atk-1.27.0.exported.base.dir</echo><!-- works ok -->
<property name="atk.version" value="1.26.0"/>
<property name="atk.base.dir" value="${atk-${atk.version}.exported.base.dir}"<!-- doesn't
work-->

I tried to do it with
<property name="atk.base.dir" refid="atk-${atk.version}.exported.base.dir"<!-- also
doesn't work-->
But that doesn't work because the loaded property does not have an id, only a name, so the
refid lookup fails.

I just want to set my external dependency versions in one place!

It cannot be that hard!

All help gratefully received!

TOM DALTON



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