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Posted to user@ant.apache.org by Michael Sunde <ms...@actional.com> on 2004/01/17 01:30:06 UTC
RE: is it possible to create targets dynamically? - Found Solution

Hi,

It took a little while, but I found a way of creating targets dynamically using javascript.

Benefits of this approach:
- can call the dynamic ant target from the command line like a standard target. No need to set an extra property.
- the target dependencies seems to work. A static target can depend on a dynamically created target.

scriptdef is impressive :>

Thanks,
Michael

====================================
build.xml
====================================
<project name="test" default="all" basedir=".">
	
<!-- create a new target -->
<scriptdef name="createTarget" language="javascript">
   <attribute name="name"/>
   <element name="body" type="sequential"/>
   <![CDATA[
      function newInstance(className)
      {
         return java.lang.Class.forName(className).newInstance();
      }

      var target = newInstance("org.apache.tools.ant.Target");

      target.setProject(project);
      target.setName(attributes.get("name"));
      target.setDescription("Dynamic target named: " + attributes.get("name"));
      target.addTask(elements.get("body").get(0));

      project.addTarget(target);
   ]]>
</scriptdef>

<!-- macro that creates a target -->
<macrodef name="echoTarget">
   <attribute name="name" />
   <sequential>
      <createTarget name="@{name}">
         <body>
           <echo>@{name} target executed.</echo>
           <!-- the real work goes here. -->
         </body>
      </createTarget>
   </sequential>
</macrodef>

<!-- multiple dynamic targets -->
<echoTarget name="dynamic1"/>
<echoTarget name="dynamic2"/>
<echoTarget name="dynamic3"/>
<echoTarget name="dynamic4"/>

<!-- depend on a dynamic target -->
<target name="all" depends="dynamic1, dynamic2"/>

</project>


====================================
Output of Calling: ant
====================================
Buildfile: build.xml

dynamic1:
     [echo] dynamic1 target executed.

dynamic2:
     [echo] dynamic2 target executed.

all:

BUILD SUCCESSFUL
Total time: 2 seconds


====================================
Output of Calling: ant dynamic3
====================================
Buildfile: build.xml

dynamic3:
     [echo] dynamic3 target executed.

BUILD SUCCESSFUL
Total time: 2 seconds



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