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// embedded_builder.h
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#pragma once
namespace mongo {
// utility class for assembling hierarchical objects
class EmbeddedBuilder {
public:
EmbeddedBuilder(BSONObjBuilder* b) {
_builders.push_back(std::make_pair("", b));
}
// It is assumed that the calls to prepareContext will be made with the 'name'
// parameter in lex ascending order.
void prepareContext(std::string& name) {
int i = 1, n = _builders.size();
while (
i < n && name.substr(0, _builders[i].first.length()) == _builders[i].first &&
(name[_builders[i].first.length()] == '.' || name[_builders[i].first.length()] == 0)) {
name = name.substr(_builders[i].first.length() + 1);
++i;
}
for (int j = n - 1; j >= i; --j) {
popBuilder();
}
for (std::string next = splitDot(name); !next.empty(); next = splitDot(name)) {
addBuilder(next);
}
}
void appendAs(const BSONElement& e, std::string name) {
if (e.type() == Object &&
e.valuesize() == 5) { // empty object -- this way we can add to it later
std::string dummyName = name + ".foo";
prepareContext(dummyName);
return;
}
prepareContext(name);
back()->appendAs(e, name);
}
BufBuilder& subarrayStartAs(std::string name) {
prepareContext(name);
return back()->subarrayStart(name);
}
void done() {
while (!_builderStorage.empty())
popBuilder();
}
static std::string splitDot(std::string& str) {
size_t pos = str.find('.');
if (pos == std::string::npos)
return "";
std::string ret = str.substr(0, pos);
str = str.substr(pos + 1);
return ret;
}
private:
void addBuilder(const std::string& name) {
std::shared_ptr<BSONObjBuilder> newBuilder(new BSONObjBuilder(back()->subobjStart(name)));
_builders.push_back(std::make_pair(name, newBuilder.get()));
_builderStorage.push_back(newBuilder);
}
void popBuilder() {
back()->done();
_builders.pop_back();
_builderStorage.pop_back();
}
BSONObjBuilder* back() {
return _builders.back().second;
}
std::vector<std::pair<std::string, BSONObjBuilder*>> _builders;
std::vector<std::shared_ptr<BSONObjBuilder>> _builderStorage;
};
} // namespace mongo
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