/*    Copyright 2014 MongoDB Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#include "mongo/platform/basic.h"

#include "mongo/client/dbclientcursorshimarray.h"
#include "mongo/client/dbclientcursor.h"

namespace mongo {

DBClientCursorShimArray::DBClientCursorShimArray(DBClientCursor& c, const std::string& arrayField)
    : cursor(c), iter(NULL, NULL), has_array(false), array_field(arrayField) {}

bool DBClientCursorShimArray::more() {
    bool r = false;

    if (!has_array) {
        if (cursor.rawMore()) {
            BSONObj val = cursor.rawNext();

            if (val.hasField(array_field)) {
                BSONObj arr = val[array_field].Obj();

                if (!arr.isEmpty()) {
                    iter = BSONObjIterator(arr);
                    r = true;
                }
            }
        }

        has_array = true;
    } else {
        r = iter.more();
    }

    return r;
}

BSONObj DBClientCursorShimArray::next() {
    BSONObj b;

    if (!has_array) {
        uassert(0, "DBClientCursorShimArray next() called but more() is false", more());
    } else {
        b = iter.next().Obj();
    }

    return b;
}
}
