ChainableFactory.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2015 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 +
#pragma once
 
#include "MantidKernel/Chainable.h"
#include "MantidKernel/DllConfig.h"
#include <memory>
#include <stdexcept>
 
namespace Mantid {
namespace Kernel {
 
template <typename Factory, typename Product, typename Argument> class ChainableFactory : public Chainable<Factory> {
public:
  std::unique_ptr<Product> create(const Argument &argument) const {
    if (this->canInterpret(argument)) {
      return std::unique_ptr<Product>(this->createRaw(argument));
    } else {
      if (this->hasSuccessor()) {
        return Chainable<Factory>::m_successor->create(argument);
      } else {
        throw std::invalid_argument("No successor MDUnitFactory");
      }
    }
  }
 
private:
  virtual Product *createRaw(const Argument &argument) const = 0;
 
  virtual bool canInterpret(const Argument &unitString) const = 0;
};
 
} // namespace Kernel
} // namespace Mantid