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IdOperation.h

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// $Header: /nfs/slac/g/glast/ground/cvs/xmlUtil/xmlUtil/id/IdOperation.h,v 1.6 2002/04/05 18:28:44 jrb Exp $

#ifndef XMLUTIL_IDOPERATION_H
#define XMLUTIL_IDOPERATION_H

#include <dom/DOM_Element.hpp>
#include "xmlUtil/id/NamedId.h"
#include <iostream>
#include <string>

namespace xmlUtil {



  class IdOperation;
  std::ostream& operator<<(std::ostream& s, const IdOperation& op);


  class IdOperation {
  public:

    virtual ~IdOperation() {};
    friend class IdConversion;  

    virtual std::string myOp() const 
    {return std::string("IDENTITY (default) ");}
    // Perhaps need to throw exception if inputId isn't compatible
    // with requested operation??

  protected:
    // Convert input NamedId in place.  Do we really want this?? 
    // Probably not.
    /* Return true if /b inputId has whatever fields might be
        needed for the operation.  This base class just leaves the
        the input alone and always returns true. */
    // virtual bool convert(NamedId* inputId) {return true;};

    virtual NamedId * convert(const NamedId& inputId);
    // Might also want something to convert a simple identifier (i.e.,
    // just a list of integers without accompanying field names).
    // However converters work in terms of fields names, so one needs
    // an Id Dictionary w.r.t which one can generate a NamedId out of
    // the Identifier, then invoke the above version of convert.

    IdOperation(DOM_Element);

    // Default constructor produces an operation which acts on any NamedId 
    // and does nothing to it.  
    // Not yet clear whether this can be made private
    IdOperation() {}
  };
}
#endif

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