//b will be the value part of an array-typed BSONElement
void Projection::appendArray( BSONObjBuilder& b , const BSONObj& a , bool nested) const {
int skip = nested ? 0 : _skip;
int limit = nested ? -1 : _limit;
if (skip < 0) {
skip = max(0, skip + a.nFields());
}
int i=0;
BSONObjIterator it(a);
while (it.more()) {
BSONElement e = it.next();
if (skip) {
skip--;
continue;
}
if (limit != -1 && (limit-- == 0)) {
break;
}
switch(e.type()) {
case Array: {
BSONObjBuilder subb;
appendArray(subb , e.embeddedObject(), true);
b.appendArray(b.numStr(i++), subb.obj());
break;
}
case Object: {
BSONObjBuilder subb;
BSONObjIterator jt(e.embeddedObject());
while (jt.more()) {
append(subb , jt.next());
}
b.append(b.numStr(i++), subb.obj());
break;
}
default:
if (_include)
b.appendAs(e, b.numStr(i++));
}
}
}
