Hi Dean,
I use this technique frequently as in this example lifted straight
from my code, see below.
All you have to remember is that a top level project owns many targets
which in turn own many tasks,
so just make sure you set up the parent/child references in both
directions.
// create the ant parent project
Project project = new Project();
project.setName("project");
project.init();
// create the child target
Target target = new Target();
target.setName("target");
project.addTarget(target);
project.addBuildListener(new Log4jListener());
// create the child untar task with gzip compression
Untar untar = new Untar();
untar.setTaskName("untar");
untar.setSrc(artifactFile);
untar.setDest(new File("."));
Untar.UntarCompressionMethod method = new
Untar.UntarCompressionMethod();
method.setValue("gzip");
untar.setCompression(method);
untar.setProject(project);
untar.setOwningTarget(target);
target.addTask(untar);
project.execute();
I am also the architect of ProtoJ over at google code http://code.google.com/p/protoj/
which builds on ant and other
dependencies to control a project from java rather than script.
- Ashley
On 11 Jun 2009, at 16:28, Dean Schulze wrote:
The Ant documentation has a section titled "Using Ant Tasks Outside
of Ant" which gives a teaser for how to use the Ant libraries from
Java
code. In theory it seems simple enough to replace build.xml with
Build.java. The Ant documentation hints at some undocumented
dependencies that I'll have to discover (undocumented from the point
of
view of using Ant from within Java).
Using Java instead of xml to do an Ant build seems so obvious I
wonder why there hasn't been a parallel track over the years for
Build.java as well as build.xml.
I asked this same question over at stackoverflow.com:
http://stackoverflow.com/questions/972574/replacing-build-xml-with-build-java-using-java-and-the-ant-libraries-as-a-build
The answers indicate that it isn't difficult to do, but that it is
necessary to "spoof" the project and target objects.
While it all looks encouraging I haven't seen any actual examples of
how to deal with the undocumented issues mentioned. Has anyone
documented how to do Ant builds from Java?
Thanks.
Dean
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