dbclientcursorshimtransform.h

/*    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.
 */
 
#pragma once
 
#include "mongo/client/dbclientcursorshim.h"
#include "mongo/stdx/functional.h"
 
namespace mongo  {
 
    class DBClientCursor;
 
    class DBClientCursorShimTransform : public DBClientCursorShim {
    public:
        DBClientCursorShimTransform(
            DBClientCursor& c,
            const stdx::function<bool(const BSONObj& input, BSONObj* output)>& transformation
        );
 
        virtual BSONObj next();
        virtual bool more();
 
    private:
        DBClientCursor& cursor;
        stdx::function<bool(const BSONObj&, BSONObj*)> transformation;
        BSONObj nextDoc;
    };
 
} // namespace mongo