itkXMLFile.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 __itkXMLFile_h
#define __itkXMLFile_h
#include "itkLightProcessObject.h"
#include "expat.h"
#include <fstream>

namespace itk
{
class XMLReaderBase:public LightProcessObject
{
public:
  typedef XMLReaderBase Self;

  itkSetStringMacro(Filename);

  itkGetStringMacro(Filename);

  virtual int CanReadFile(const char *name) = 0;

  virtual void GenerateOutputInformation();

  virtual void StartElement(const char *name, const char **atts) = 0;

  virtual void EndElement(const char *name) = 0;

  virtual void CharacterDataHandler(const char *inData, int inLength) = 0;

protected:
  XMLReaderBase() {}
  virtual ~XMLReaderBase() {}
  void PrintSelf(std::ostream & os, Indent indent) const;

  void parse(void);

  std::string m_Filename;

private:
  XMLReaderBase(const Self &);  //purposely not implemented
  void operator=(const Self &); //purposely not implemented
};

template< typename T >
class XMLReader: public XMLReaderBase
{
public:
  typedef XMLReader Self;

  void SetOutputObject(T *obj) { m_OutputObject = obj; }

  T * GetOutputObject(void) { return m_OutputObject; }

protected:
  XMLReader() {}
  virtual ~XMLReader() {}

  T *m_OutputObject;

private:
  XMLReader(const Self &);      //purposely not implemented
  void operator=(const Self &); //purposely not implemented
};

template< typename T >
class XMLWriterBase:public LightProcessObject
{
public:
  typedef XMLWriterBase Self;

  XMLWriterBase()
  {
    m_InputObject = 0;
  }

  itkSetStringMacro(Filename);

  itkGetStringMacro(Filename);

  virtual int CanWriteFile(const char *name) = 0;

  void SetObject(T *toWrite) { m_InputObject = toWrite; }

  virtual int WriteFile() = 0;

  void WriteStartElement(const char *const tag, std::ofstream & file)
  {
    file << '<' << tag << '>';
  }

  void WriteEndElement(const char *const tag, std::ofstream & file)
  {
    file << '<' << '/'  << tag << '>';
  }

  void WriteCharacterData(const char *const data, std::ofstream & file)
  {
    file << data;
  }

  void WriteStartElement(std::string & tag, std::ofstream & file)
  {
    WriteStartElement(tag.c_str(), file);
  }

  void WriteEndElement(std::string & tag, std::ofstream & file)
  {
    WriteEndElement(tag.c_str(), file);
  }

  void WriteCharacterData(std::string & data, std::ofstream & file)
  {
    WriteCharacterData(data.c_str(), file);
  }

protected:
  T          *m_InputObject;    // object to write out to an XML file
  std::string m_Filename;       // name of file to write.

private:
  XMLWriterBase(const Self &);  //purposely not implemented
  void operator=(const Self &); //purposely not implemented
};
}
#endif