WorkspaceModifyOperation deleteOperaton = new WorkspaceModifyOperation() {
			@Override
			protected void execute(IProgressMonitor monitor) throws CoreException, InvocationTargetException, InterruptedException {
			
IProject project =  getProject();
String serializedModelPath = performSerialization(project);	 
cleanTempModels(project, serializedModelPath);
monitor.done();

}
};
deleteOperaton .run(new NullProgressMonitor());

//here the delete
private void cleanTempModels(IProject project, String alfModelPath) {

IFile file = project.getFile(alfModelPath);
boolean isFile = file instanceof IFile;
boolean isAccessable = file.isAccessible();
if (isFile && isAccessable) {
file.delete(true, new NullProgressMonitor());
}
}

ResourceSet set = new ResourceSetImpl();
Resource res = set.getResource(URI.createURI(modelPath), true);
res.delete(null);