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From b.@spamcop.net
Subject Re: nested properties anyone?
Date Thu, 15 Aug 2002 21:00:59 GMT
Pardon my ignorance, it took me some extensive "googleing" to find out that
ant-contrib is a Sourceforge project that has nothing to do (per say) with an
official Ant site. For anyone interested the manual is at
http://ant-contrib.sourceforge.net/ant-contrib/manual/

Bob

Quoting Erik Hatcher <jakarta-ant@ehatchersolutions.com>:

>  From chapter 10 of Java Development with Ant [1] (gotta make my plugs 
> somehow!):
> 
> Copying properties
> In section 3.10.1 we demonstrate an obscure way to dereference property 
> values by using Ant's built-in capabilities. The ant-contrib [2] 
> <propertycopy> task makes property dereferencing much cleaner and easier 
> to understand. We have refactored the example we presented earlier to 
> use <propertycopy>:
> 
> <target name="propertycopy">
>    <property name="X" value="Y"/>
>    <property name="Y" value="Z"/>
>    <propertycopy name="A" from="${X}"/>
>    <echo message="A = ${A}"/>
> </target>
> 
> The value of ${X} is "Y". The from attribute of <propertycopy> refers to 
> an Ant property name, "Y" in this example. The value of the property Y 
> is "Z", so the output is "A = Z". This is a much nicer alternative than 
> using the refid tricks.
> 
> [1] http://www.amazon.com/exec/obidos/ASIN/1930110588
> [2] http://sourceforge.net/projects/ant-contrib/
> 
> 	Erik
> 
> 
> 
> Matt Benson wrote:
> > Agreed on nested properties expansion.
> > 
> > -Matt
> > 
> > --- bo@spamcop.net wrote:
> > 
> >>Problem:
> >>From the list of the predefined properties key=value
> >>select one based on the
> >>value of some other property and use it as a default
> >>
> >>Example:
> >>I have a list of servers (hosts.properties), where
> >>key is an actual hostname
> >>(obtained from hostname command) and value is a
> >>domain, e.g.
> >>host_one=host_one.somewhere.com
> >>host_two=host_two.some.place.else.com
> >>I want to determine on which machine I'm running the
> >>script and use a full
> >>domain name further in the script.
> >>
> >>Solution?
> >>1. <property file="hosts.properties"/>
> >>2. <exec outputproperty="hostname"
> >>executable="hostname"/>
> >>3. Now I have a ${hostname} and I want to assign its
> >>value to the property
> >>build.host that I use in my script. My first
> >>reaction was to do this:
> >><property name="build.host" refid="${${hostname}}"/>
> >>Well it didn't work because curleys are evaluated
> >>only once and I'm getting the
> >>value of build.host literaly as "${hostname}"
> >>Is there any other way? Any way? 
> >>And I think that it would be nice feature to
> >>reevaluate the nested brackets
> >>
> >>Bob Stone
> >>
> >>--
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> 
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