/*=========================================================================

  Program:   DICOMParser
  Module:    DICOMCallback.h
  Language:  C++

  Copyright (c) 2003 Matt Turek
  All rights reserved.
  See Copyright.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 notice for more information.

=========================================================================*/

#ifndef __DICOM_CALLBACK_H_
#define __DICOM_CALLBACK_H_

#ifdef _MSC_VER
#pragma warning(disable : 4514)
#pragma warning(disable : 4786)
#pragma warning(disable : 4503)
#pragma warning(disable : 4710)
#pragma warning(disable : 4702)
#pragma warning(push, 3)
#endif

#include "DICOMConfig.h"
#include "DICOMParser.h"

//
// Pure virtual class that specifies the interface
// for a DICOMCallback.
//
// The DICOMParser allows a vector of callbacks to
// be specified for each group element tag.  When
// a group, element with a registered callback is
// encountered, the callback is called and passed
// the group, element, type, data, and data length.
//

class DICOM_EXPORT DICOMCallback
{
public:
  virtual ~DICOMCallback() {}
  virtual void Execute(DICOMParser* parser, doublebyte group, doublebyte element,
    DICOMParser::VRTypes type, unsigned char* val, quadbyte len) = 0;
};

//
// Subclass of DICOMCallback which can be used
// with member functions.
//
template <class T>
class DICOMMemberCallback : public DICOMCallback
{
public:
  typedef void (T::*TMemberFunctionPointer)(DICOMParser* parser, doublebyte group,
    doublebyte element, DICOMParser::VRTypes type, unsigned char* val, quadbyte len);

  //
  // Method to set the object and member function pointers
  // that will be called in the callback.
  //
  void SetCallbackFunction(T* object, TMemberFunctionPointer memberFunction)
  {
    ObjectThis = object;
    MemberFunction = memberFunction;
  }

  //
  // Execute method implementation from DICOMCallback.
  //
  void Execute(DICOMParser* parser, doublebyte group, doublebyte element, DICOMParser::VRTypes type,
    unsigned char* val, quadbyte len) override
  {
    if (MemberFunction)
    {
      ((*ObjectThis).*(MemberFunction))(parser, group, element, type, val, len);
    }
  }

protected:
  T* ObjectThis;
  TMemberFunctionPointer MemberFunction;
};

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif
