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/**
* Copyright (C) 2013 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 "mongo/db/clientcursor.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/lite_parsed_query.h"
#include "mongo/db/query/plan_cache.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/query/runner.h"
#include "mongo/db/query/stage_builder.h"
namespace mongo {
/**
* EOFRunner is EOF immediately and doesn't do anything except return EOF and possibly die
* during a yield.
*/
class EOFRunner : public Runner {
public:
EOFRunner(const string& ns) : _ns(ns), _cq(CanonicalQuery::getInternalQuery()) { }
Runner::RunnerState getNext(BSONObj* objOut, DiskLoc* dlOut) {
return Runner::RUNNER_EOF;
}
virtual void saveState() { }
virtual bool restoreState() {
// TODO: Does this value matter?
return false;
}
virtual void setYieldPolicy(Runner::YieldPolicy policy) { }
virtual void invalidate(const DiskLoc& dl) { }
virtual const string& ns() { return _ns; }
virtual const CanonicalQuery& getQuery() {
// This shouldn't be called and is going away shortly anyway.
verify(0);
return *_cq;
}
virtual void kill() { }
private:
string _ns;
scoped_ptr<CanonicalQuery> _cq;
};
} // namespace mongo
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