// introspect.h
// system management stuff.

/**
*    Copyright (C) 2008 10gen Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    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
*    GNU Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include "../stdafx.h"
#include "jsobj.h"
#include "pdfile.h"

namespace mongo {

    auto_ptr<Cursor> getSpecialCursor(const char *ns);

    class SingleResultObjCursor : public Cursor {
        int i;
    protected:
        BSONObjBuilder b;
        void reg(const char *as); /* register as a certain namespace */
    public:
        SingleResultObjCursor() {
            i = 0;
        }
        virtual bool ok() {
            return i == 0;
        }
        virtual Record* _current() {
            assert(false);
            return 0;
        }
        virtual DiskLoc currLoc() {
            assert(false);
            return DiskLoc();
        }

        virtual void fill() = 0;

        virtual BSONObj current() {
            assert(i == 0);
            fill();
            return b.done();
        }

        virtual bool advance() {
            i++;
            return false;
        }

        virtual string toString() {
            return "SingleResultObjCursor";
        }

    };

    /* --- profiling --------------------------------------------
       do when database->profile is set
    */

    void profile(const char *str,
                 int millis);

} // namespace mongo