public void delete() {
begin();
Extent extent = db().getExtent(JB4.class, false);
Iterator it = extent.iterator();
while (it.hasNext()) {
db().deletePersistent(it.next());
addToCheckSum(5);
}
extent.closeAll();
commit();
}
protected Vec4 computeReferenceCenter(DrawContext dc) {
Extent extent = this.getExtent(dc);
return extent != null ? extent.getCenter() : null;
}