column_mapping_converter.h

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/*
  Copyright (c) 2024, 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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  as designated in a particular file or component or in included license
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  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 General Public License for more details.
 
  You should have received a copy of the GNU General Public License
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#ifndef ROUTER_SRC_MYSQL_REST_SERVICE_SRC_MRS_DATABASE_CONVERTERS_COLUMN_MAPPING_CONVERTER_H_
#define ROUTER_SRC_MYSQL_REST_SERVICE_SRC_MRS_DATABASE_CONVERTERS_COLUMN_MAPPING_CONVERTER_H_
 
#include <stdexcept>
#include <string>
 
#include "helper/json/text_to.h"
#include "mrs/database/entry/object.h"
 
namespace mrs {
namespace database {
 
class ColumnMappingConverter {
 public:
  ColumnMappingConverter() {}
 
  void operator()(entry::ForeignKeyReference::ColumnMapping *out,
                  const char *value) const {
    if (nullptr == value) {
      *out = {};
      return;
    }
 
    rapidjson::Document doc = helper::json::text_to_document(value);
    if (!doc.IsArray()) {
      throw std::runtime_error(
          "'object_reference's column 'metadata', must be an array");
    }
 
    out->clear();
    for (const auto &col : doc.GetArray()) {
      if (!col.IsObject())
        throw std::runtime_error(
            "'object_reference's column 'metadata', element must be an "
            "object.");
      if (!col.HasMember("base") || !col["base"].IsString())
        throw std::runtime_error(
            "'object_reference's column 'metadata', element must contain "
            "'base' field with "
            "string value.");
      if (!col.HasMember("ref") || !col["ref"].IsString())
        throw std::runtime_error(
            "'object_reference's column 'metadata', element must contain 'ref' "
            "field with string "
            "value.");
 
      out->emplace_back(col["base"].GetString(), col["ref"].GetString());
    }
  }
};
 
}  // namespace database
}  // namespace mrs
 
#endif /* ROUTER_SRC_MYSQL_REST_SERVICE_SRC_MRS_DATABASE_CONVERTERS_COLUMN_MAPPING_CONVERTER_H_ \
        */