XMLMap.hpp

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#ifndef ADUL_XMLMAP_HPP
#define ADUL_XMLMAP_HPP
 
#include "../extern/tinyxml2.hpp"
#include "exceptions.hpp"
#include "smallUtils.hpp"
 
#include <unordered_map>
 
namespace adul { namespace atm {
 
template <typename keyT, typename valueT> class XMLMap {
public:
  std::unordered_map<keyT, valueT> map;
 
  void saveMapToXMLElement(adul::xml::XMLElement *const pElement, adul::xml::XMLDocument *const xmlDoc) const {
    adul::xml::XMLElement *pSubEl = nullptr;
 
    for (auto cur = map.begin(); cur != map.end(); cur++) {
      pSubEl = xmlDoc->NewElement("mapElement");
 
      pSubEl->SetAttribute("key", 
        adul::utils::convert_string<std::string>(cur->first).c_str());
      pSubEl->SetAttribute("value", 
        adul::utils::convert_string<std::string>(cur->second).c_str());
 
      pElement->InsertEndChild(pSubEl);
    }
  }
 
  void loadMapFromXMLElement(const adul::xml::XMLElement *const pElement) {
    const adul::xml::XMLElement *pSubEl =
        pElement->FirstChildElement("mapElement");
 
    while (pSubEl != nullptr) {
      const char* keyAttr = pSubEl->Attribute("key");
      const char* valueAttr = pSubEl->Attribute("value");
      if (!keyAttr || !valueAttr) {
        throw adul::exceptions::Message("Missing key/value attribute in XML");
      }
 
      map[adul::utils::convert_string<keyT>(keyAttr)] =
          adul::utils::convert_string<valueT>(valueAttr);
      pSubEl = pSubEl->NextSiblingElement("mapElement");
    }
  }
 
  void saveMapToXMLFile(const char *dir) {
    adul::xml::XMLDocument document;
    adul::xml::XMLElement *pRoot = document.NewElement("root");
 
    saveMapToXMLElement(pRoot, &document);
    document.InsertFirstChild(pRoot);
 
    if (document.SaveFile(dir) != adul::xml::XMLError::XML_SUCCESS)
      throw adul::exceptions::FailedWritingXMLFile(dir);
  }
 
  void loadMapFromXMLFile(const char *dir) {
    adul::xml::XMLDocument document;
 
    if (document.LoadFile(dir) != adul::xml::XMLError::XML_SUCCESS)
      throw adul::exceptions::FailedReadingXMLFile(dir);
 
    adul::xml::XMLElement *pRoot = document.FirstChildElement("root");
    if (!pRoot) throw adul::exceptions::FailedReadingXMLFile("Missing root element");
 
    loadMapFromXMLElement(pRoot);
  }
};
 
}} // namespace adul
#endif