RCP: Switch to perspective via code

A small snippet which switches to a certain perspective via code:

IPerspectiveDescriptor[] perspectives =
PlatformUI.getWorkbench().getPerspectiveRegistry().getPerspectives();

IWorkbenchPage page =
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
    if(page != null) {
      for (IPerspectiveDescriptor des : perspectives) {
        if (des.getId().equals("my.perspective.id")) {
          page.setPerspective(des);
          break;
        }
      }
    }

return null;