ADD: list of SamplingRateCalculator to handle multi-image

Modules/Learning/Sampling/include/otbSamplingRateCalculatorList.h

+/*=========================================================================
+
+  Program:   ORFEO Toolbox
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
+  See OTBCopyright.txt for details.
+
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef otbSamplingRateCalculatorList_h
+#define otbSamplingRateCalculatorList_h
+
+#include "otbSamplingRateCalculator.h"
+#include "otbObjectList.h"
+
+namespace otb
+{
+/** \class SamplingRateCalculatorList
+ *  \brief This class is a list of sampling rate calculators.
+ *
+ * It computes sampling rates for each image and each class, given input
+ * statistics on available samples, and a sampling strategy. The sampling
+ * strategies are made from the combination of :
+ *   - the sampling strategies of otb::SamplingRateCalculator  (mono-image)
+ *   - a multi-image behaviour : proportional / constant / custom
+ *
+ * \ingroup OTBSampling
+ */
+class ITK_EXPORT SamplingRateCalculatorList
+  : public ObjectList<SamplingRateCalculator>
+{
+public:
+  /** Standard typedefs */
+  typedef SamplingRateCalculatorList          Self;
+  typedef ObjectList<SamplingRateCalculator>  Superclass;
+  typedef itk::SmartPointer<Self>             Pointer;
+  typedef itk::SmartPointer<const Self>       ConstPointer;
+
+  typedef SamplingRateCalculator::ClassCountMapType  ClassCountMapType;
+
+  /** Type macro */
+  itkNewMacro(Self);
+
+  /** Creation through object factory macro */
+  itkTypeMacro(SamplingRateCalculatorList, ObjectList);
+
+protected:
+  /** Constructor */
+  SamplingRateCalculatorList();
+
+  /** Destructor */
+  ~SamplingRateCalculatorList() ITK_OVERRIDE {}
+
+private:
+  SamplingRateCalculator(const Self &);    //purposely not implemented
+  void operator =(const Self&);    //purposely not implemented
+
+  void UpdateGlobalCounts();
+
+  ClassCountMapType m_GlobalCountMap;
+
+} // end namespace otb
+
+#endif