RunEgxWithVariable.java

public void run(IAction action) {
  	if (getFirstElementInSelection() instanceof IFile) {
			final IFile file = (IFile)getFirstElementInSelection();  		
      String projectName = file.getProject().getName();
						
			final EglFileGeneratingTemplateFactory factory = new EglFileGeneratingTemplateFactory();
			final EglTemplate template = factory.load(Activator.getDefault().getBundle().getResource("transformations/my.egx").toURI());
			
			// You'll need to loop over the list returned by this method, and
			// log any errors somewhere.
			template.getParseProblems();
			
			template.populate("projectName", projectName);
			
			template.process();
}