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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
* 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 <string>
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/pipeline/value.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
using Factory = Accumulator::Factory;
namespace {
// Used to keep track of which Accumulators are registered under which name.
static StringMap<Factory> factoryMap;
} // namespace
void Accumulator::registerAccumulator(std::string name, Factory factory) {
auto it = factoryMap.find(name);
str::stream() << "Duplicate accumulator (" << name << ") registered.",
it == factoryMap.end());
factoryMap[name] = factory;
Factory Accumulator::getFactory(StringData name) {
auto it = factoryMap.find(name);
15952, str::stream() << "unknown group operator '" << name << "'", it != factoryMap.end());
return it->second;
} // namespace mongo