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From Tibor Strausz <Tibor.Stra...@tridion.com>
Subject RE: nested properties anyone?
Date Fri, 16 Aug 2002 08:12:32 GMT
thanks i was looking for the if and ferach tasks 
now i found them :-) 

> -----Original Message-----
> From: bo@spamcop.net [mailto:bo@spamcop.net]
> Sent: Thursday, August 15, 2002 11:01 PM
> To: Bob Stone
> Subject: Re: nested properties anyone?
> 
> 
> 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
> > >>
> > >>--
> > >>To unsubscribe, e-mail:  
> > >><mailto:ant-user-unsubscribe@jakarta.apache.org>
> > >>For additional commands, e-mail:
> > >><mailto:ant-user-help@jakarta.apache.org>
> > >>
> > > 
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> > > 
> > 
> > 
> > 
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> 



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