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//@file dbclientmockcursor.h
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/client/dbclient_cursor.h"
namespace mongo {
// DBClientMockCursor supports only a small subset of DBClientCursor operations.
// It supports only iteration, including use of DBClientCursorBatchIterator. If a batchsize
// is given, iteration is broken up into multiple batches at batchSize boundaries.
class DBClientMockCursor : public DBClientCursor {
public:
DBClientMockCursor(mongo::DBClientBase* client,
const BSONArray& mockCollection,
unsigned long batchSize = 0)
: mongo::DBClientCursor(client, NamespaceString(), 0, 0, 0),
_collectionArray(mockCollection),
_iter(_collectionArray),
_batchSize(batchSize) {
if (_batchSize)
setBatchSize(_batchSize);
fillNextBatch();
}
virtual ~DBClientMockCursor() {}
bool more() override {
if (_batchSize && batch.pos == _batchSize) {
fillNextBatch();
}
return batch.pos < batch.objs.size();
}
private:
void fillNextBatch() {
int leftInBatch = _batchSize;
batch.objs.clear();
while (_iter.more() && (!_batchSize || leftInBatch--)) {
batch.objs.emplace_back(_iter.next().Obj());
}
batch.pos = 0;
}
// The BSONObjIterator expects the underlying BSONObj to stay in scope while the
// iterator is in use, so we store it here.
BSONArray _collectionArray;
BSONObjIterator _iter;
unsigned long _batchSize;
// non-copyable , non-assignable
DBClientMockCursor(const DBClientMockCursor&);
DBClientMockCursor& operator=(const DBClientMockCursor&);
};
} // namespace mongo
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