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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/>.
*/
#include "pch.h"
#include "accumulator.h"
#include "db/pipeline/expression_context.h"
#include "db/pipeline/value.h"
namespace mongo {
void AccumulatorPush::processInternal(const Value& input, bool merging) {
if (!merging) {
if (!input.missing()) {
vpValue.push_back(input);
_memUsageBytes += input.getApproximateSize();
}
}
else {
// If we're merging, we need to take apart the arrays we
// receive and put their elements into the array we are collecting.
// If we didn't, then we'd get an array of arrays, with one array
// from each merge source.
verify(input.getType() == Array);
const vector<Value>& vec = input.getArray();
vpValue.insert(vpValue.end(), vec.begin(), vec.end());
for (size_t i=0; i < vec.size(); i++) {
_memUsageBytes += vec[i].getApproximateSize();
}
}
}
Value AccumulatorPush::getValue(bool toBeMerged) const {
return Value(vpValue);
}
AccumulatorPush::AccumulatorPush() {
_memUsageBytes = sizeof(*this);
}
void AccumulatorPush::reset() {
vector<Value>().swap(vpValue);
_memUsageBytes = sizeof(*this);
}
intrusive_ptr<Accumulator> AccumulatorPush::create() {
return new AccumulatorPush();
}
const char *AccumulatorPush::getOpName() const {
return "$push";
}
}
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