DeltaEMode.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidKernel/DeltaEMode.h"
 
#include <boost/algorithm/string/predicate.hpp>
#include <map>
#include <sstream>
#include <stdexcept>
#include <utility>
 
namespace Mantid::Kernel {
namespace // unnamed
{
struct ModeIndex {
  std::map<DeltaEMode::Type, std::string> index{{DeltaEMode::Elastic, "Elastic"},
                                                {DeltaEMode::Direct, "Direct"},
                                                {DeltaEMode::Indirect, "Indirect"},
                                                {DeltaEMode::Undefined, "Undefined"}};
};
ModeIndex &typeStringLookup() {
  static ModeIndex typeLookup;
  return typeLookup;
}
} // namespace
 
const std::vector<std::string> DeltaEMode::availableTypes() {
  const ModeIndex &lookup = typeStringLookup();
  std::vector<std::string> modes;
  modes.reserve(lookup.index.size());
  for (const auto &iter : lookup.index) {
    if (iter.first == DeltaEMode::Undefined)
      continue;
    modes.emplace_back(iter.second);
  }
  return modes;
}
 
std::string DeltaEMode::asString(const Type mode) {
  const ModeIndex &lookup = typeStringLookup();
  auto iter = lookup.index.find(mode);
  if (iter != lookup.index.end()) {
    return iter->second;
  } else {
    std::ostringstream os;
    os << "DeltaEMode::asString - Unknown energy transfer mode: " << mode;
    throw std::invalid_argument(os.str());
  }
}
 
DeltaEMode::Type DeltaEMode::fromString(const std::string &modeStr) {
  const ModeIndex &lookup = typeStringLookup();
 
  auto emode = std::find_if(lookup.index.cbegin(), lookup.index.cend(),
                            [&modeStr](auto it) { return boost::iequals(it.second, modeStr); });
 
  if (emode != lookup.index.cend()) {
    return emode->first;
  }
 
  // Unknown mode
  throw std::invalid_argument("DeltaEMode::fromString - Unknown energy transfer mode: " + modeStr);
}
} // namespace Mantid::Kernel