public void setType(Class type) {
if (type == null || type == Object.class) this.type = null;
else if (isEmpty()) this.type = type;
else {
type = Data.commonType(type, getCommonType());
if (type != null) this.type = type;
}
}
public Class getCommonType() {
Class t = null;
Iterator i = iterator();
while (i.hasNext()) {
Object e = i.next();
if (e == null) continue;
else if (t == null) t = e.getClass();
else {
t = Data.commonType(t, e.getClass());
if (t == null || t == Object.class) return null;
}
}
return t;
}