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Persistence.cxx

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// $Id: Persistence.cxx,v 1.4 2001/02/09 20:29:06 jrb Exp $
//
// Implementation of the PersistentObject, and CompoundPersistentObject classes.


#include "dom/DOM_Document.hpp"
#include "xml/Persistence.h"

namespace xml {
  std::map<PersistentObject::_PersistKey, PersistentObject::_Factory*>* 
    PersistentObject::s_persist_table = 0;

  PersistentObject* PersistentObject::_Factory::create(const DOM_Element&) {
    return 0;
  }

  // persist - create an xml element out of this object

  //  DOM_Element&
  DOM_Element    PersistentObject::persist(DOM_Element& parent) const {
    DOM_Document doc = parent.getOwnerDocument();
    
    // Make a new element by specifying tagname and list of attr.
    // Note DOM spec only allows creation of non-null element when
    // it's associated with a pre-existing document.

    //    DOM_Element& newElem = 
    DOM_Element newElem = 
      doc.createElement(static_cast<DOMString> (persistKey().c_str()));
    parent.appendChild(newElem);
    
    return newElem;
  }
  
  
  // addPersistence -- register a class key with an object to create for
  //  persistence
  
  bool PersistentObject::addPersistence(const _PersistKey& i, _Factory* f) {
      
    static std::map<PersistentObject::_PersistKey, PersistentObject::_Factory*>
      splist;
      
    if (!s_persist_table)
      s_persist_table = &splist;
    
    else if ((s_persist_table->find(i) != s_persist_table->end()))      
      return false;
    
    s_persist_table->insert( std::make_pair<_PersistKey,_Factory*>(i,f) );
    
    return true;
  }
}  // end namespace xml

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