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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/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/db/exec/projection.h"
#include "mongo/db/diskloc.h"
#include "mongo/db/exec/plan_stage.h"
#include "mongo/db/exec/projection_executor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/matcher/expression.h"
namespace mongo {
ProjectionStage::ProjectionStage(ParsedProjection* projection, WorkingSet* ws, PlanStage* child,
const MatchExpression* filter)
: _projection(projection), _ws(ws), _child(child), _filter(filter) { }
ProjectionStage::~ProjectionStage() { }
bool ProjectionStage::isEOF() { return _child->isEOF(); }
PlanStage::StageState ProjectionStage::work(WorkingSetID* out) {
++_commonStats.works;
if (isEOF()) { return PlanStage::IS_EOF; }
WorkingSetID id;
StageState status = _child->work(&id);
if (PlanStage::ADVANCED == status) {
WorkingSetMember* member = _ws->get(id);
Status status = ProjectionExecutor::apply(_projection, member);
if (!status.isOK()) {
warning() << "Couldn't execute projection: " << status.toString() << endl;
return PlanStage::FAILURE;
}
*out = id;
++_commonStats.advanced;
}
else if (PlanStage::NEED_FETCH == status) {
*out = id;
++_commonStats.needFetch;
}
return status;
}
void ProjectionStage::prepareToYield() {
++_commonStats.yields;
_child->prepareToYield();
}
void ProjectionStage::recoverFromYield() {
++_commonStats.unyields;
_child->recoverFromYield();
}
void ProjectionStage::invalidate(const DiskLoc& dl) {
++_commonStats.invalidates;
_child->invalidate(dl);
}
PlanStageStats* ProjectionStage::getStats() {
_commonStats.isEOF = isEOF();
auto_ptr<PlanStageStats> ret(new PlanStageStats(_commonStats, STAGE_PROJECTION));
ret->children.push_back(_child->getStats());
return ret.release();
}
} // namespace mongo
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