private TypedId getStartOrEnd(NodeOrRelationship current, String arg) throws ShellException {
if (!current.isRelationship()) {
throw new ShellException("Only allowed on relationships");
}
Node newNode = null;
if (arg.equals(START_ALIAS)) {
newNode = current.asRelationship().getStartNode();
} else if (arg.equals(END_ALIAS)) {
newNode = current.asRelationship().getEndNode();
} else {
throw new ShellException("Unknown alias '" + arg + "'");
}
return NodeOrRelationship.wrap(newNode).getTypedId();
}
