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/**
* Copyright (c) 2011 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/platform/basic.h"
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
REGISTER_ACCUMULATOR(sum, AccumulatorSum::create);
REGISTER_EXPRESSION(sum, ExpressionFromAccumulator<AccumulatorSum>::parse);
const char* AccumulatorSum::getOpName() const {
return "$sum";
}
void AccumulatorSum::processInternal(const Value& input, bool merging) {
// do nothing with non numeric types
if (!input.numeric())
return;
// upgrade to the widest type required to hold the result
totalType = Value::getWidestNumeric(totalType, input.getType());
if (totalType == NumberInt || totalType == NumberLong) {
long long v = input.coerceToLong();
longTotal += v;
doubleTotal += v;
} else if (totalType == NumberDouble) {
double v = input.coerceToDouble();
doubleTotal += v;
} else {
// non numerics should have returned above so we should never get here
verify(false);
}
}
intrusive_ptr<Accumulator> AccumulatorSum::create() {
return new AccumulatorSum();
}
Value AccumulatorSum::getValue(bool toBeMerged) const {
if (totalType == NumberLong) {
return Value(longTotal);
} else if (totalType == NumberDouble) {
return Value(doubleTotal);
} else if (totalType == NumberInt) {
return Value::createIntOrLong(longTotal);
} else {
massert(16000, "$sum resulted in a non-numeric type", false);
}
}
AccumulatorSum::AccumulatorSum() : totalType(NumberInt), longTotal(0), doubleTotal(0) {
// This is a fixed size Accumulator so we never need to update this
_memUsageBytes = sizeof(*this);
}
void AccumulatorSum::reset() {
totalType = NumberInt;
longTotal = 0;
doubleTotal = 0;
}
}
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