public <T extends File> T getDescendentOfType(Class<T> type) {
Assert.notNull(type, "cannot search a descendent with type null");
if (type.isAssignableFrom(getClass())) {
return (T) this;
} else {
for (Directory child : this.getFiles(Directory.class).toList()) {
T c = child.getDescendentOfType(type);
if (c != null) {
return c;
}
}
}
return null;
}
