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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/>.
*/
#include "mongo/db/query/stage_builder.h"
#include "mongo/db/exec/collection_scan.h"
namespace mongo {
//static
bool StageBuilder::build(const QuerySolution& solution, PlanStage** rootOut,
WorkingSet** wsOut) {
QuerySolutionNode* root = solution.root.get();
if (NULL == root) { return false; }
if (STAGE_COLLSCAN == root->getType()) {
const CollectionScanNode* csn = static_cast<const CollectionScanNode*>(root);
CollectionScanParams params;
params.ns = csn->name;
params.tailable = csn->tailable;
params.direction = (csn->direction == 1) ? CollectionScanParams::FORWARD
: CollectionScanParams::BACKWARD;
*wsOut = new WorkingSet();
*rootOut = new CollectionScan(params, *wsOut, csn->filter);
return true;
}
else {
return false;
}
}
} // namespace mongo
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