public synchronized void addToDirectory(PseudoPath dir, FSImage child) {
if (!getType(dir).equals(FileType.DIR.getName())) {
throw new IllegalArgumentException("Can add files only to directories.");
}
Element parent = getElement(dir);
Element newChild = new Element(child.fileTree);
String nameOfChildRoot = child.fileTree.getAttributeValue("name");
PseudoPath pathToChild = dir.resolve(nameOfChildRoot);
Element oldChild = getElement(pathToChild);
if (oldChild != null) {
parent.replaceChild(oldChild, newChild);
} else {
parent.appendChild(newChild);
}
}
