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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/document.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
namespace {
const char subTotalName[] = "subTotal";
const char countName[] = "count";
}
void AccumulatorAvg::processInternal(const Value& input, bool merging) {
if (!merging) {
// non numeric types have no impact on average
if (!input.numeric())
return;
_total += input.getDouble();
_count += 1;
} else {
// We expect an object that contains both a subtotal and a count.
// This is what getValue(true) produced below.
verify(input.getType() == Object);
_total += input[subTotalName].getDouble();
_count += input[countName].getLong();
}
}
intrusive_ptr<Accumulator> AccumulatorAvg::create() {
return new AccumulatorAvg();
}
Value AccumulatorAvg::getValue(bool toBeMerged) const {
if (!toBeMerged) {
if (_count == 0)
return Value(0.0);
return Value(_total / static_cast<double>(_count));
} else {
return Value(DOC(subTotalName << _total << countName << _count));
}
}
AccumulatorAvg::AccumulatorAvg() : _total(0), _count(0) {
// This is a fixed size Accumulator so we never need to update this
_memUsageBytes = sizeof(*this);
}
void AccumulatorAvg::reset() {
_total = 0;
_count = 0;
}
const char* AccumulatorAvg::getOpName() const {
return "$avg";
}
}
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