/**
* Copyright (c) 2017 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 .
*
* 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/accumulation_statement.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
/* ------------------------- AccumulatorMergeObjects ----------------------------- */
REGISTER_ACCUMULATOR(mergeObjects, AccumulatorMergeObjects::create);
REGISTER_EXPRESSION(mergeObjects, ExpressionFromAccumulator::parse);
const char* AccumulatorMergeObjects::getOpName() const {
return "$mergeObjects";
}
intrusive_ptr AccumulatorMergeObjects::create(
const boost::intrusive_ptr& expCtx) {
return new AccumulatorMergeObjects(expCtx);
}
AccumulatorMergeObjects::AccumulatorMergeObjects(
const boost::intrusive_ptr& expCtx)
: Accumulator(expCtx) {
_memUsageBytes = sizeof(*this);
}
void AccumulatorMergeObjects::reset() {
_memUsageBytes = sizeof(*this);
_output.reset();
}
void AccumulatorMergeObjects::processInternal(const Value& input, bool merging) {
if (input.nullish()) {
return;
}
uassert(40400,
str::stream() << "$mergeObjects requires object inputs, but input " << input.toString()
<< " is of type "
<< typeName(input.getType()),
(input.getType() == BSONType::Object));
FieldIterator iter = input.getDocument().fieldIterator();
while (iter.more()) {
Document::FieldPair pair = iter.next();
// Ignore missing values only, null and undefined are still considered.
if (pair.second.missing())
continue;
_output.setField(pair.first, pair.second);
}
_memUsageBytes = sizeof(*this) + _output.getApproximateSize();
}
Value AccumulatorMergeObjects::getValue(bool toBeMerged) {
return _output.freezeToValue();
}
} // namespace mongo