Link Eclipse file object with RTC one

Hello, I'm trying to find a way to map eclipse IFile resource with RTC IFileItem. Simply I want to receive from eclipse command selection a RTC IFileItem object. I was able to establish how to get IFile but it's not what I need. Currently implementation is following:

ISelection selection = HandlerUtil.getCurrentSelection(event);
if (selection instanceof IStructuredSelection) {
    IStructuredSelection ssel = (IStructuredSelection) selection;
    Object obj = ssel.getFirstElement();
    IFile selectedFile = (IFile) Platform.getAdapterManager().getAdapter(obj, IFile.class);
    if (selectedFile == null) {
        if (obj instanceof IAdaptable) {
            selectedFile = (IFile) ((IAdaptable) obj).getAdapter(IFile.class);
        }
    }
    if (selectedFile != null) {
        //do sth
    }
}

Moreover is there a way to check file path relying on LoadRule? Let's say that I need to get path of particular file from one LoadRule in other LoadRule.