MandatoryValidator.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2007 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/DllConfig.h"
#include "MantidKernel/TypedValidator.h"
#include <memory>
#include <vector>
 
namespace Mantid {
namespace Kernel {
namespace Detail {
template <typename T> MANTID_KERNEL_DLL bool checkIsEmpty(const T &);
 
template <typename T> bool checkIsEmpty(const std::vector<T> &value) { return value.empty(); }
 
template <typename T> struct IsEmpty {
  static bool check(const T &value) { return checkIsEmpty(value); }
};
} // namespace Detail
 
template <typename TYPE> class MandatoryValidator : public TypedValidator<TYPE> {
public:
  IValidator_sptr clone() const override { return std::make_shared<MandatoryValidator>(); }
 
private:
  std::string checkValidity(const TYPE &value) const override {
    if (Detail::IsEmpty<TYPE>::check(value))
      return "A value must be entered for this parameter";
    else
      return "";
  }
};
 
} // namespace Kernel
} // namespace Mantid