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SerializeBase.h

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// Author : Samvel Khalatian (samvel at fnal dot gov)
// Created: 07/25/07
// License: GPL

#ifndef SERIALIZE_BASE
#define SERIALIZE_BASE

#include <iosfwd>
#include <istream>

#include <boost/archive/archive_exception.hpp>

class FlagTxt;

// --[ BASE ARCHIVE MANAGER ]--------------------------------------------------

class SerializeBase {
  public:
    SerializeBase();
    virtual ~SerializeBase();

    bool write( std::ostream &roOut, const FlagTxt &roFLAGTXT) const;

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

    inline FlagTxt *getFlag() { return poFlagTxt_; }

  private:
    virtual void writeFlag( std::ostream &roOut, 
                            const FlagTxt &roFLAGTXT) const = 0;

    virtual void readFlag ( FlagTxt *poFlagTxt, std::istream &roIn) = 0;

    FlagTxt *poFlagTxt_;
};

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

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

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

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

      poFlagTxt_ = poFlagTxt;
    } 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_BASE

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