ProductOfCyclicGroups.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 "MantidGeometry/Crystal/ProductOfCyclicGroups.h"
#include "MantidGeometry/Crystal/CyclicGroup.h"
#include "MantidGeometry/Crystal/SymmetryOperationFactory.h"
 
#include <algorithm>
 
namespace Mantid::Geometry {
 
ProductOfCyclicGroups::ProductOfCyclicGroups(const std::string &generators) : Group(*(getGeneratedGroup(generators))) {}
 
ProductOfCyclicGroups::ProductOfCyclicGroups(const std::vector<Group_const_sptr> &factorGroups)
    : Group(*(getProductOfCyclicGroups(factorGroups))) {}
 
Group_const_sptr ProductOfCyclicGroups::getGeneratedGroup(const std::string &generators) const {
  std::vector<SymmetryOperation> operations = SymmetryOperationFactory::Instance().createSymOps(generators);
  std::vector<Group_const_sptr> factorGroups = getFactorGroups(operations);
 
  return getProductOfCyclicGroups(factorGroups);
}
 
std::vector<Group_const_sptr>
ProductOfCyclicGroups::getFactorGroups(const std::vector<SymmetryOperation> &symmetryOperations) const {
  std::vector<Group_const_sptr> groups;
  groups.reserve(symmetryOperations.size());
  std::transform(
      symmetryOperations.cbegin(), symmetryOperations.cend(), std::back_inserter(groups),
      [](const auto &symmetryOperation) { return GroupFactory::create<CyclicGroup>(symmetryOperation.identifier()); });
  return groups;
}
 
Group_const_sptr
ProductOfCyclicGroups::getProductOfCyclicGroups(const std::vector<Group_const_sptr> &factorGroups) const {
  Group_const_sptr productGroup = std::make_shared<const Group>(*(factorGroups.front()));
 
  for (size_t i = 1; i < factorGroups.size(); ++i) {
    productGroup = productGroup * factorGroups[i];
  }
 
  return productGroup;
}
 
} // namespace Mantid::Geometry