itkParameterMapInterface.h

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/*=========================================================================
 *
 *  Copyright UMC Utrecht and contributors
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
 
#ifndef itkParameterMapInterface_h
#define itkParameterMapInterface_h
 
#include "elxConversion.h"
 
#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkMacro.h"
#include "itkNumericTraits.h"
 
#include "itkParameterFileParser.h"
 
#include <algorithm> // For count.
#include <iostream>
#include <memory>      // For unique_ptr.
#include <type_traits> // For is_same.
 
namespace itk
{
 
class ParameterMapInterface : public Object
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(ParameterMapInterface);
 
  using Self = ParameterMapInterface;
  using Superclass = Object;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ParameterMapInterface, Object);
 
  using ParameterValuesType = ParameterFileParser::ParameterValuesType;
  using ParameterMapType = ParameterFileParser::ParameterMapType;
 
  void
  SetParameterMap(const ParameterMapType & parMap);
 
  // \todo: we could think of a warning level. (maybe you want warnings, but
  // not when for example a parameter is not found at entry entry_nr but at entry 0 instead
  itkSetMacro(PrintErrorMessages, bool);
  itkGetConstMacro(PrintErrorMessages, bool);
 
  bool
  HasParameter(const std::string & parameterName) const
  {
    return this->m_ParameterMap.count(parameterName) > 0;
  }
 
  std::size_t
  CountNumberOfParameterEntries(const std::string & parameterName) const;
 
  template <class T>
  bool
  ReadParameter(T &                 parameterValue,
                const std::string & parameterName,
                const unsigned int  entry_nr,
                const bool          produceWarningMessage,
                std::string &       warningMessage) const
  {
    warningMessage = "";
 
    std::size_t numberOfEntries = this->CountNumberOfParameterEntries(parameterName);
 
    if (numberOfEntries == 0)
    {
      if (produceWarningMessage && this->m_PrintErrorMessages)
      {
        std::ostringstream outputStringStream;
        outputStringStream << "WARNING: The parameter \"" << parameterName << "\", requested at entry number "
                           << entry_nr << ", does not exist at all.\n"
                           << "  The default value \"" << parameterValue << "\" is used instead.";
        warningMessage = outputStringStream.str();
      }
 
      return false;
    }
 
    const ParameterValuesType & vec = this->m_ParameterMap.find(parameterName)->second;
 
    if (entry_nr >= numberOfEntries)
    {
      if (produceWarningMessage && this->m_PrintErrorMessages)
      {
        std::ostringstream outputStringStream;
        outputStringStream << "WARNING: The parameter \"" << parameterName << "\" does not exist at entry number "
                           << entry_nr << ".\n  The default value \"" << parameterValue << "\" is used instead.";
        warningMessage = outputStringStream.str();
      }
      return false;
    }
 
    bool castSuccesful = elastix::Conversion::StringToValue(vec[entry_nr], parameterValue);
 
    if (!castSuccesful)
    {
      itkExceptionMacro("ERROR: Casting entry number "
                        << entry_nr << " for the parameter \"" << parameterName << "\" failed!\n"
                        << "  You tried to cast \"" << vec[entry_nr] << "\" from std::string to "
                        << typeid(parameterValue).name() << '\n');
    }
 
    return true;
 
  } // end ReadParameter()
 
 
  bool
  ReadParameter(bool &              parameterValue,
                const std::string & parameterName,
                const unsigned int  entry_nr,
                const bool          produceWarningMessage,
                std::string &       warningMessage) const;
 
  template <class T>
  bool
  ReadParameter(T &                 parameterValue,
                const std::string & parameterName,
                const unsigned int  entry_nr,
                std::string &       warningMessage) const
  {
    return this->ReadParameter(parameterValue, parameterName, entry_nr, true, warningMessage);
  }
 
 
  template <class T>
  bool
  ReadParameter(T &                 parameterValue,
                const std::string & parameterName,
                const std::string & prefix,
                const unsigned int  entry_nr,
                const int           default_entry_nr,
                const bool          produceWarningMessage,
                std::string &       warningMessage) const
  {
    std::string fullname = prefix + parameterName;
    bool        found = false;
 
    std::string dummyString = "";
    if (default_entry_nr >= 0)
    {
      unsigned int uintdefault = static_cast<unsigned int>(default_entry_nr);
      found |= this->ReadParameter(parameterValue, parameterName, uintdefault, false, dummyString);
      found |= this->ReadParameter(parameterValue, parameterName, entry_nr, false, dummyString);
      found |= this->ReadParameter(parameterValue, fullname, uintdefault, false, dummyString);
      found |= this->ReadParameter(parameterValue, fullname, entry_nr, false, dummyString);
    }
    else
    {
      found |= this->ReadParameter(parameterValue, parameterName, entry_nr, false, dummyString);
      found |= this->ReadParameter(parameterValue, fullname, entry_nr, false, dummyString);
    }
 
    if (!found && produceWarningMessage && this->m_PrintErrorMessages)
    {
      return this->ReadParameter(parameterValue, parameterName, entry_nr, true, warningMessage);
    }
 
    return found;
  }
 
 
  template <class T>
  bool
  ReadParameter(T &                 parameterValue,
                const std::string & parameterName,
                const std::string & prefix,
                const unsigned int  entry_nr,
                const unsigned int  default_entry_nr,
                std::string &       warningMessage) const
  {
    return this->ReadParameter(parameterValue, parameterName, prefix, entry_nr, default_entry_nr, true, warningMessage);
  }
 
 
  template <class T>
  bool
  ReadParameter(std::vector<T> &    parameterValues,
                const std::string & parameterName,
                const unsigned int  entry_nr_start,
                const unsigned int  entry_nr_end,
                const bool          produceWarningMessage,
                std::string &       warningMessage) const
  {
    warningMessage = "";
 
    std::size_t numberOfEntries = this->CountNumberOfParameterEntries(parameterName);
 
    if (numberOfEntries == 0)
    {
      if (produceWarningMessage && this->m_PrintErrorMessages)
      {
        std::ostringstream outputStringStream;
        outputStringStream << "WARNING: The parameter \"" << parameterName << "\", requested between entry numbers "
                           << entry_nr_start << " and " << entry_nr_end << ", does not exist at all.\n"
                           << "  The default values are used instead.";
        warningMessage = outputStringStream.str();
      }
      return false;
    }
 
    if (entry_nr_start > entry_nr_end)
    {
      itkExceptionMacro("WARNING: The entry number start ("
                        << entry_nr_start << ") should be smaller than entry number end (" << entry_nr_end
                        << "). It was requested for parameter \"" << parameterName << "\".\n");
    }
 
    if (entry_nr_end >= numberOfEntries)
    {
      itkExceptionMacro("WARNING: The parameter \"" << parameterName << "\" does not exist at entry number "
                                                    << entry_nr_end << ".\nThe default value \"" << T{}
                                                    << "\" is used instead.");
    }
 
    const ParameterValuesType & vec = this->m_ParameterMap.find(parameterName)->second;
 
    unsigned int j = 0;
    for (unsigned int i = entry_nr_start; i < entry_nr_end + 1; ++i)
    {
      bool castSuccesful = elastix::Conversion::StringToValue(vec[i], parameterValues[j]);
      ++j;
 
      if (!castSuccesful)
      {
        itkExceptionMacro("ERROR: Casting entry number "
                          << i << " for the parameter \"" << parameterName << "\" failed!\n"
                          << "  You tried to cast \"" << vec[i] << "\" from std::string to "
                          << typeid(parameterValues[0]).name() << '\n');
      }
    }
 
    return true;
  }
 
 
  bool
  ReadParameter(std::vector<std::string> & parameterValues,
                const std::string &        parameterName,
                const unsigned int         entry_nr_start,
                const unsigned int         entry_nr_end,
                const bool                 produceWarningMessage,
                std::string &              warningMessage) const;
 
 
  std::vector<std::string>
  GetValues(const std::string & parameterName) const
  {
    const auto found = m_ParameterMap.find(parameterName);
    return (found == m_ParameterMap.cend()) ? std::vector<std::string>{} : found->second;
  }
 
  template <typename T>
  std::unique_ptr<std::vector<T>>
  RetrieveValues(const std::string & parameterName) const
  {
    const auto found = m_ParameterMap.find(parameterName);
    if (found == m_ParameterMap.end())
    {
      return nullptr;
    }
    std::vector<T> result;
    result.reserve(found->second.size());
 
    for (const std::string & str : found->second)
    {
      T value{};
 
      if (elastix::Conversion::StringToValue(str, value))
      {
        result.push_back(value);
      }
      else
      {
        const auto entry_nr = &str - found->second.data();
        itkExceptionMacro("Failed to cast parameter \"" << parameterName << "\" entry number " << entry_nr
                                                        << " value \"" << str << "\" to type \"" << typeid(T).name()
                                                        << "\"!");
      }
    }
    return std::make_unique<std::vector<T>>(std::move(result));
  }
 
 
protected:
  ParameterMapInterface();
  ~ParameterMapInterface() override;
 
private:
  ParameterMapType m_ParameterMap{};
 
  bool m_PrintErrorMessages{ true };
};
 
} // end of namespace itk
 
#endif // end itkParameterMapInterface_h