public Path cd(String newPath) {
PathInfo newPathInfo = new PathInfo(newPath);
if (newPathInfo.absolute) {
this.path = newPathInfo.toString();
return this;
}
String p = this.path + (this.path.isEmpty() ? "" : "/") + newPath;
newPathInfo = new PathInfo(p);
if (newPathInfo.absolute
&& !newPathInfo.components.isEmpty()
&& newPathInfo.components.get(0).equals("..")) {
throw new IllegalArgumentException("Cannot cd higher than the root directory");
}
this.path = newPathInfo.toString();
return this;
}
