/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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 __itkNumericTraitsArrayPixel_h
#define __itkNumericTraitsArrayPixel_h

#include "itkNumericTraits.h"
#include "itkArray.h"

namespace itk
{
/** \brief NumericTraits for Array
 * \tparam T type of the array component
 */
template< typename T >
class NumericTraits< Array< T > >
{
private:

  typedef  typename NumericTraits< T >::AbsType        ElementAbsType;
  typedef  typename NumericTraits< T >::AccumulateType ElementAccumulateType;
  typedef  typename NumericTraits< T >::FloatType      ElementFloatType;
  typedef  typename NumericTraits< T >::PrintType      ElementPrintType;
  typedef  typename NumericTraits< T >::RealType       ElementRealType;

public:

  /** Return the type of the native component type. */
  typedef T              ValueType;
  typedef Array< T >     Self;

  /** Unsigned component type */
  typedef Array< ElementAbsType > AbsType;

  /** Accumulation of addition and multiplication. */
  typedef Array< ElementAccumulateType > AccumulateType;

  /** Typedef for operations that use floating point instead of real precision
    */
  typedef Array< ElementFloatType > FloatType;

  /** Return the type that can be printed. */
  typedef Array< ElementPrintType > PrintType;

  /** Type for real-valued scalar operations. */
  typedef Array< ElementRealType > RealType;

  /** Type for real-valued scalar operations. */
  typedef ElementRealType ScalarRealType;

  /** Measurement vector type */
  typedef Self MeasurementVectorType;

  /** Component wise defined element
   *
   * \note minimum value for floating pointer types is defined as
   * minimum positive normalize value.
   */
  static const Self max(const Self & a)
  {
    Self b( a.Size() );

    b.Fill( NumericTraits< T >::max() );
    return b;
  }

  static const Self min(const Self & a)
  {
    Self b( a.Size() );

    b.Fill( NumericTraits< T >::min() );
    return b;
  }

  static const Self ZeroValue(const Self  & a)
  {
    Self b( a.Size() );

    b.Fill(NumericTraits< T >::Zero);
    return b;
  }

  static const Self OneValue(const Self & a)
  {
    Self b( a.Size() );

    b.Fill(NumericTraits< T >::One);
    return b;
  }

  static const Self NonpositiveMin(const Self & a)
  {
    Self b( a.Size() );
    b.Fill( NumericTraits< T >::NonpositiveMin() );
    return b;
  }

  /** Set the length of the input array and fill it with zeros. */
  static void SetLength(Array< T > & m, const unsigned int s)
  {
    m.SetSize(s);
    m.Fill(NumericTraits< T >::Zero);
  }

  /** Get the length of the input array. */
  static unsigned int GetLength(const Array< T > & m)
  {
    return m.GetSize();
  }

  static void AssignToArray( const Self & v, MeasurementVectorType & mv )
  {
    mv = v;
  }

  template<typename TArray>
  static void AssignToArray( const Self & v, TArray & mv )
  {
    for( unsigned int i=0; i<GetLength(v); i++ )
      {
      mv[i] = v[i];
      }
  }

#if !defined(ITK_LEGACY_REMOVE)
  //The extra #ifdef is need because the itkLegacyMacro
  //can not format a static const member function properly
  //in the case of removing the code.

  /** \deprecated use ZeroValue() instead */
  itkLegacyMacro(static const Self Zero(const Self  & a))
  {
    Self b( a.Size() );
    b.Fill(NumericTraits< T >::Zero);
    return b;
  }

  /** \deprecated use OneValue() instead */
  itkLegacyMacro(static const Self One(const Self & a))
  {
    Self b( a.Size() );
    b.Fill(NumericTraits< T >::One);
    return b;
  }
#endif

};
} // end namespace itk

#endif // __itkNumericTraitsArrayPixel_h
