itkDOMNodeXMLReader.h

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/*=========================================================================
 *
 *  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 itkDOMNodeXMLReader_h
#define itkDOMNodeXMLReader_h

#include "itkDOMNode.h"
#include "itkObject.h"
#include "ITKIOXMLExport.h"

#include <istream>

namespace itk
{

class ITKIOXML_EXPORT DOMNodeXMLReader : public Object
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(DOMNodeXMLReader);

  using Self = DOMNodeXMLReader;
  using Superclass = Object;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(DOMNodeXMLReader, Object);

  using OutputType = DOMNode;
  using OutputPointer = OutputType::Pointer;

  itkSetStringMacro(FileName);

  itkGetStringMacro(FileName);

  itkSetObjectMacro( DOMNodeXML, OutputType );
#if !defined(ITK_LEGACY_REMOVE)
  //Provide backwards compatible interface
  virtual void SetOutput (OutputType * _arg) { this->SetDOMNodeXML(_arg); }
#endif


  //NOTE:  The m_DOMNodeXML is only
  //       exposed via the Source generation interface
  //       by the GetOutput() method that mimics
  //       a process object.
  virtual const OutputType * GetOutput () const { return this->m_DOMNodeXML.GetPointer(); }
  virtual OutputType * GetOutput() { return this->m_DOMNodeXML.GetPointer(); }

#if !defined(ITK_LEGACY_REMOVE)
  // This interface was exposed in ITKv4 when the itkGetModifiableObjectMacro was used
  virtual OutputType * GetModifiedOutput() { return this->m_DOMNodeXML.GetPointer(); }
#endif

  void Update( std::istream& is );

  virtual void Update();

  virtual void StartElement( const char* name, const char** atts );

  virtual void EndElement( const char* name );

  virtual void CharacterDataHandler( const char* text, int len );

protected:
  DOMNodeXMLReader();

private:
  std::string m_FileName;

  OutputPointer m_DOMNodeXML;

  OutputType* m_Context{nullptr};
};

} // namespace itk

inline std::istream& operator>>( std::istream& is, itk::DOMNode& object )
{
  itk::DOMNodeXMLReader::Pointer reader = itk::DOMNodeXMLReader::New();
  reader->SetDOMNodeXML( &object );
  reader->Update( is );
  return is;
}

#endif // itkDOMNodeXMLReader_h