public void write(ParsedType type, PrintWriter pw) {
pw.println("setClassUsage('"+type.element.getQualifiedName()+"',");
JsonWriter w = new JsonWriter(pw);
w.startObject();
for (Entry<Element, Set<TreePath>> e : type.findReferers(pss.getSourcePositions()).entrySet()) {
w.key(getKeyName(type,e.getKey()));
NodePkgInfo root = new NodePkgInfo("");
// builds a top-down tree.
for (TreePath t : e.getValue())
root.add(t).getLeaves().add(t);