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Date: Wed, 20 Feb 2008 11:13:51 +0800
From: Olivier Gies <olivier.gies@bull.net>
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To: Ant Users List <user@ant.apache.org>
Subject: Re: Migrating form ANT 1.6 to 1.7: xmlproperty
References: <47BADE15.3060803@kelis.fr>
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Hi Sam,

 From my point of view, a solid approach would simply be to override 
Ant's <xmlproperty> task with a new attribute like "setempty", set to 
"false", or "true" depending on the convenience, by default... Then use 
<taskdef> to define your overriding class as the <xmlproperty> task.

Olivier

-------- Original Message  --------
Subject: Migrating form ANT 1.6 to 1.7: xmlproperty
From: Samuel Monsarrat <samuel.monsarrat@kelis.fr>
To: user@ant.apache.org
Date: 19/02/2008 21:49

> I am attempting to migrate a large ANT build system from 1.6 to 1.7 and 
> am running into a problem with xmlproperty.
> We use xmlproperty massively in our build system and very often "stack" 
> several xmlproperty calls in order to build a complex property 'tree', 
> where several inter-dependent build files will declare and/or overload 
> parts of the tree using xmlproperty.
> Our approach however is completely incompatible with ANT 1.7 due to a 
> modification to xmlproperty (bug 26286 c.f. 
> http://issues.apache.org/bugzilla/show_bug.cgi?id=26286) that forces 
> "empty" elements in an XML property tree to be declared.
> 
> Consider the following exemple:
> ===> build_A.xml :
> <project  name="Bui_A" default="All">
>    <xmlproperty file="about_A.xml"/>
>    <import file="build_B.xml"/>
>    <target name="All">
>        <ant target="Bui_B.main"/>
>    </target>
> </project>
> 
> ===> about_A.xml:
> <app>
>    <version developmentStage="beta"/>
> </app>
> 
> ===> build_B.xml :
> <project  name="Bui_B">
>    <xmlproperty file="about_B.xml"/>
>    <target name="Bui_B.main">
>       <echo message="The version number is: '${app.version}'"/>
>       <echo message="The development stage is: 
> ${app.version(developmentStage)}"/>
>       <!-- etc.... -->
>    </target>
> </project>
> 
> ===> about_B.xml:
> <app>
>    <version developmentStage="final">2.4.0</version>
> </app>
> 
> The aim is : When running build_A.xml use most of about_B.xml but 
> overload certain parts of it with about_A.xml
> 
> In ANT 1.6 about_A.xml would only set property 
> app.version(developmentStage) effectively overloading the 
> developmentStage defined in about_B.xml, but with ANT 1.7, about_A.xml 
> also sets the property app.version to "empty" thus making it impossible 
> for about_B.xml to define it as 2.4.0.
> 
> In ANT 1.6 the output  is:
> [echo] The version number is: '2.4.0'
> [echo] The development stage is: 'beta'
> 
> in ANT 1.7 the output is:
> [echo] The version number is: ''
> [echo] The development stage is: 'beta'
> 
> This makes it impossible to use xmlproperty to overload a single path in 
> a complex property tree, and therefore destroys one of the main features 
> of the task as far as I can see.
> Has anybody come across the same problem? any workaround?
> Regards,
> Samuel.
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
*Olivier Gies*

*Delivery Manager
Customs & Tax Software Engineering Center
Bull, Architect of an Open World ^TM
Phone: +86 (10) 65978001 - Ext 555 *

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