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SerializeXML.h

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// Flag Store Manager (store in external file/stream). Serialize in XML 
// format.
// 
// Author : Samvel Khalatian (samvel at fnal dot gov)
// Created: 06/01/07
// License: GPL

#ifndef SERIALIZE_XML
#define SERIALIZE_XML

#include <iosfwd>

class FlagXML;

// --[ XML ARCHIVE MANAGER ]---------------------------------------------------

class SerializeXML {
  public:
    SerializeXML();
    ~SerializeXML();

    bool write( std::ostream &roOut, const FlagXML &roFLAGXML) const;

    template<class T> T *read( std::istream &roIn);

    inline FlagXML *getFlag() { return poFlagXML_; }

  private:
    void readFlag( FlagXML *poFlagXML, std::istream &roIn);

    FlagXML *poFlagXML_;
};

template<class T> T *SerializeXML::read( std::istream &roIn) {
  if( poFlagXML_) {
    delete poFlagXML_;
    poFlagXML_ = 0;
  }

  // [Note: Object will be deleted by SerializeXML (!)]
  T *poT = new T();

  // Check if this is actually child class of FlagXML
  if( FlagXML *poFlagXML = dynamic_cast<FlagXML *>( poT)) {

    // Attempt to read flag from tree
    try {
      readFlag( poFlagXML, roIn);

      poFlagXML_ = poFlagXML;
    } catch( ...) { 
      // Failed: maybe stream contains other flag saved - not T?
      delete poT;
      poT = 0;
    }
  } else {
    // Not a child
    delete poT;
    poT = 0;
  }

  return poT;
}

#endif // SERIALIZE_XML

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