file.getName() + ".extracted");
dir.mkdir();
Expand expand = (Expand)getProject().createTask("unjar");
expand.setSrc(file);
expand.setDest(dir);
expand.perform();
importFile = new File(dir, "build.xml");
if (! importFile.exists()) {
throw new BuildException("Cannot find a 'build.xml' file in " +
file.getName());
}