text: /*
   * Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
   *
   * This file is part of Orfeo Toolbox
   *
   *     https://www.orfeo-toolbox.org/
   *
   * 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
   *
   * 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 otbUnaryFunctorObjectListFilter_h
  #define otbUnaryFunctorObjectListFilter_h
  
  #include "otbObjectListToObjectListFilter.h"
  
  namespace otb
  {
  
  /** \class UnaryFunctorObjectListFilter
    * \brief Process each element in the ObjectList with the functor
    *
    * Each element of the ObjectList is processed by the functor.
    * This is similar to the python map() function.
    *
    *
    * \ingroup ObjectListFilter
   *
   * \ingroup OTBObjectList
   */
  template <class TInputList, class TOutputList, class TFunction>
  class ITK_EXPORT UnaryFunctorObjectListFilter : public otb::ObjectListToObjectListFilter<TInputList, TOutputList>
  {
  public:
    /** Standard class typedefs. */
    typedef UnaryFunctorObjectListFilter Self;
    typedef otb::ObjectListToObjectListFilter<TInputList, TOutputList> Superclass;
    typedef itk::SmartPointer<Self>       Pointer;
    typedef itk::SmartPointer<const Self> ConstPointer;
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(UnaryFunctorObjectListFilter, ObjectListToObjectListFilter);
  
    /** Some typedefs. */
    typedef TFunction                           FunctorType;
    typedef TInputList                          InputListType;
    typedef TOutputList                         OutputListType;
    typedef typename TInputList::ConstPointer   InputListPointer;
    typedef typename TOutputList::Pointer       OutputListPointer;
    typedef typename TInputList::ConstIterator  InputListIterator;
    typedef typename TOutputList::ConstIterator OutputListIterator;
  
    /** Get the functor object.  The functor is returned by reference.
     * (Functors do not have to derive from itk::LightObject, so they do
     * not necessarily have a reference count. So we cannot return a
     * SmartPointer.) */
    FunctorType& GetFunctor()
    {
      return m_Functor;
    }
  
    const FunctorType& GetFunctor() const
    {
      return m_Functor;
    }
  
    /** Set the functor object.  This replaces the current Functor with a
     * copy of the specified Functor. This allows the user to specify a
     * functor that has ivars set differently than the default functor.
     * This method requires an operator!=() be defined on the functor
     * (or the compiler's default implementation of operator!=() being
     * appropriate). */
    void SetFunctor(const FunctorType& functor)
    {
      if (m_Functor != functor)
      {
        m_Functor = functor;
        this->Modified();
      }
    }
  
  protected:
    UnaryFunctorObjectListFilter();
    ~UnaryFunctorObjectListFilter() override
    {
    }
  
    /** Multi-threading implementation */
  
    void AfterThreadedGenerateData() override;
  
    /** startIndex and stopIndex represent the indices of the Objects to
    examine in thread threadId */
    void ThreadedGenerateData(unsigned int startIndex, unsigned int stopIndex, itk::ThreadIdType threadId) override;
  
    /** End Multi-threading implementation */
  
  private:
    UnaryFunctorObjectListFilter(const Self&) = delete;
    void operator=(const Self&) = delete;
  
    FunctorType m_Functor;
  };
  
  } // end namespace otb
  
  #ifndef OTB_MANUAL_INSTANTIATION
  #include "otbUnaryFunctorObjectListFilter.hxx"
  #endif
  
  #endif
  