protected PyType dtype;

protected String name;

protected void checkCallerType(PyType type) {

if (type == dtype || type.isSubType(dtype)) {

return;

}

String msg = String.format("descriptor '%s' requires a '%s' object but received a '%s'",

name, dtype.fastGetName(), type.fastGetName());

throw Py.TypeError(msg);

}

protected void checkGetterType(PyType type) {

if (type == dtype || type.isSubType(dtype)) {

return;

}

String msg = String.format("descriptor '%s' for '%s' objects doesn't apply to '%s' object",

name, dtype.fastGetName(), type.fastGetName());

throw Py.TypeError(msg);

}

/* Traverseproc implementation */

@Override

public int traverse(Visitproc visit, Object arg) {

return dtype != null ? visit.visit(dtype, arg) : 0;

}

@Override

public boolean refersDirectlyTo(PyObject ob) {

return ob == dtype;

}