merge.h

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/*
  Copyright (c) 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  You should have received a copy of the GNU General Public License
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*/
 
#include <optional>
#include <set>
#include <string>
 
namespace helper {
namespace json {
 
/**
 * @brief Merge fields from j2 into j1, which must be JSON objects.
 *
 * Returns a new JSON object with all fields of j1 plus fields of j2 which are
 * not in j1 (ie j2 has default values).
 *
 * If skip_attributes is given, then these fields will not be merged from j2
 * even if they're missing in j1.
 * If overwrite_attributes is given, then these fields will always be merged
 * from j2 even if they have values in j1 and even if they're missing in j1
 */
std::string merge_objects(const std::string &j1, const std::string &j2,
                          const std::set<std::string> &skip_attributes,
                          const std::set<std::string> &overwrite_attributes);
 
std::optional<std::string> merge_objects(
    std::optional<std::string> j1, std::optional<std::string> j2,
    const std::set<std::string> &skip_attributes,
    const std::set<std::string> &overwrite_attributes);
 
}  // namespace json
}  // namespace helper