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From: "Heath, Graham" <graham.heath@ts.fujitsu.com>
To: "user@ant.apache.org" <user@ant.apache.org>
Date: Tue, 28 Sep 2010 14:03:46 +0200
Subject: conditional global variables?
Thread-Topic: conditional global variables?
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On Sep 26, 2010, at 8:23 AM, Marina wrote:

> Hello!
> In essence, I would like to know how to define a global property
> conditionally, and then have it available to all build files via <import>=
.
>

What I do is supply a -Dtarget=3DDebug or Release via the commandline which=
 causes a build.properties file to be built with useful things like build.n=
umber, build.time, build.date, build.machine, build.type and so on.

  <target name=3D"init" depends=3D"set_flags,announce,env.. ">
    <property file=3D"build.number"/>
    <delete file=3D"build.properties"/>
    <propertyfile comment=3D"Build Information"
                  file=3D"build.properties">
      <entry key=3D"build.number"
             value=3D"${build.number}"/>
      <entry key=3D"build.version"
             value=3D"${version}"/>
      <entry key=3D"temp.dir"
            value=3D"${temp.dir.path}"/>
      <entry key=3D"build.host"
            value=3D"${env.COMPUTERNAME}"/>
      <entry key=3D"build.user"
            value=3D"${user.name}"/>...

All my subservient build files just import this file <property file=3D"${ro=
ot.dir}/metadata/build.properties"/> - oh and debug builds copy it into the=
 dist directory too.. That way I have a chance to know on a test machine wh=
ere/when/who built the failing jar!

root.dir
    |____metadata
    |            |__ build.number
    |            |__ build.properties
    |____Source jar1
    |            |__ build.xml
    |____Source jar2
    |            |__ build.xml

Cheers
Graham

> Now the details:
> I have a build.common.xml file with all global properties and paths
> defined. I import it into my main build and component build files via
> <import>, and this makes everything that is defined in the common file
> available to all other build files.
> build.common.xml:
>            <property name=3D"build.classes" value=3D"${build}/classes"/>
>            ...
>      <path id=3D"compile.classpath">
>            <pathelement location=3D"${build}/classes"/>
>            <path refid=3D"jdk.classpath"/>
>            <fileset dir=3D"${lib}">
>                  <include name=3D"**/*.jar"/>
>            </fileset>
> ...
>
>
> Then, I have a main build.xml that calls a few component build.xml via
> <ant file=3D...> call.
> If I <import> the build.common.xml into all my build files - I have
> all properties and paths available to all builds.
>
> It all works great, but now I want to have the build.classes property
> set conditionally, based on the build mode (dev vs. release). Ideally,
> I would like something similar to the C #ifdef macros:
>
> build.common.xml:
> if
>    mode=3D'dev'
> then
>            <property name=3D"build.classes"
> value=3D"${build}/dev/classes"/> else
>            <property name=3D"build.classes"
> value=3D"${build}/release/classes"/>
>
> I can do the <if> logic if I define this property in the main build,
> for example, as part of some <init> task. But, it means that the
> property is not global anymore, and, which is more important, I cannot
> define my paths in the build.common.xml based on the value of this
> property. At least I could not figure out yet a way to do it...
>
> So, I was pondering over a few options:
> 1. define all properties like that and paths in the main build.xml and
> pass them as parameters to all component builds - very involved and infle=
xible...
> 2. define a target <init> in the build.common.xml that defines all
> those properties and paths - and make all builds call it (or depend on
> it) - again, very involved in terms of refactoring my existing builds, an=
d inflexible.
> 3. any other way???
>
> If only I could just define that one global property conditionally! I
> feel like I'm missing some basic core concept here....
>
> Any pointers?
>
> Thanks!
> Marina


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