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Date: Thu, 24 Jan 2002 22:39:22 -0800
From: "Frank E. Weiss" <frankw@well.com>
Subject: Re: looping in ant
To: Ant Users List <ant-user@jakarta.apache.org>
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Scott, see if this can solve your problem.


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Here's a quick example of doing loops with ant.
There are three files.

build.xml
---------
This is the original file with a new target "build-all".
This new target chains a style task with an ant task.
The style task creates a "build-cruise.xml" intermediate
file which is the build file for the subsequent ant task.

cruise-master-project.xml
-------------------------
This file contains the list of projects to be built. As
it is in XML, it uses a two level hierarchy. The root
element is <cruise-master-build> which contains zero or
more <cruise-project> elements. The text contents of each
<cruise-project> is the value for the build.project parameter.

build.xsl
---------
This is an XSL stylesheet that take the list of project parameters
from the "cruise-master-project.xml" file and creates an
intermediate ant build file called "build-cruise.xml". The
stylesheet matches the <cruise-master-build> root element in the
"cruise-master-project.xml" file. It then constructs an ant
<project> element. First it adds one target to the project. This target
consists of antcall tasks, one for each <cruise-project> element
in the "cruise-master-project.xml" file. Each antcall also has
a parameter with the name "build.project" and the value from the
"cruise-master-project.xml" file. Following this target,
the stylesheet adds all the targets from the "build.xml" file.
The resulting ant file consists of a project whose default target
does an antcall of the target "build-one-project" for each of
the project types in the "cruise-master-project.xml" file.

build-cruise.xml
----------------
An intermediate generated ant file.

notes
-----
Tested with Apache Xalan-J 2.0.1. Download the Xalan-J binaries, remove
crimson.jar and jaxp.jar from the ant lib directory, Copy the xalan
and xerces jars from the xalan bin directory to the ant lib directory.


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<?xml version="1.0"?>

<xsl:stylesheet
	version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

	<xsl:output method="xml" indent="yes"/>

	<xsl:param name="build-file" select="build.xml"/>

    <xsl:template match="cruise-master-build">
		<project name="cruise-control" default="build-all">
			<target name="build-all">
				<xsl:for-each select="cruise-project">
					<antcall target="build-one-project">
						<param name="build.project" value="{normalize-space(text())}"/>
					</antcall>
				</xsl:for-each>
			</target>
			<xsl:copy-of select="document($build-file)/project/target"/>
		</project>
    </xsl:template>


</xsl:stylesheet>

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<?xml version="1.0"?>

<cruise-master-build>
	<cruise-project>
		framework
	</cruise-project>
	<cruise-project>
		viewer
	</cruise-project>
	<cruise-project>
		importer
	</cruise-project>
	<cruise-project>
		printer
	</cruise-project>
</cruise-master-build>

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<?xml version="1.0"?>

<project name="cruise-master" default="build-projects">
	<target name="build-projects">
		<style
			force="yes"
			style="build.xsl"
			in="cruise-master-build.xml"
			out="build-cruise.xml">
			<param name="build-file" expression="build.xml"/>
		</style>
		<ant antfile="build-cruise.xml"/>
	</target>

	<target name="build-one-project">
		<echo message="build-one-project: ${build.project}"/>
	</target>

	<!-- additional targets -->

</project>


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