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node-tracker-observer.h

/**
 * Convenience base class for XML::NodeObservers that need to extract data
 * from an XMLNodeTracker and queue up added or removed nodes for later
 * processing
 *
 * Authors:
 * David Yip <yipdw@rose-hulman.edu>
 *
 * Copyright (c) 2005 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifndef __WHITEBOARD_NODE_TRACKER_OBSERVER_H__
#define __WHITEBOARD_NODE_TRACKER_OBSERVER_H__

#include "xml/node-observer.h"

#include "jabber_whiteboard/node-tracker-event-tracker.h"
#include "jabber_whiteboard/node-tracker.h"
#include "jabber_whiteboard/typedefs.h"

namespace Inkscape {

namespace XML {

class Node;

}

namespace Whiteboard {

class NodeTrackerObserver : public XML::NodeObserver {
public:
      NodeTrackerObserver(XMLNodeTracker* xnt) : _xnt(xnt) { }
      virtual ~NodeTrackerObserver() { }

      // just reinforce the fact that we don't implement any of the 
      // notification methods here
    virtual void notifyChildAdded(XML::Node &node, XML::Node &child, XML::Node *prev)=0;

    virtual void notifyChildRemoved(XML::Node &node, XML::Node &child, XML::Node *prev)=0;

    virtual void notifyChildOrderChanged(XML::Node &node, XML::Node &child,
                                         XML::Node *old_prev, XML::Node *new_prev)=0;

    virtual void notifyContentChanged(XML::Node &node,
                                      Util::SharedCStringPtr old_content,
                                      Util::SharedCStringPtr new_content)=0;

    virtual void notifyAttributeChanged(XML::Node &node, GQuark name,
                                        Util::SharedCStringPtr old_value,
                                        Util::SharedCStringPtr new_value)=0;


      // ...but we do provide node tracking facilities
      KeyToNodeActionList& getNodeTrackerActions()
      {
            return this->newnodes;
      }

      KeyToNodeActionList getNodeTrackerActionsCopy()
      {
            return this->newnodes;
      }

      void clearNodeBuffers()
      {
            this->newnodes.clear();
            this->newkeys.clear();
            this->actions.clear();
      }

protected:
      std::string _findOrGenerateNodeID(XML::Node& node)
      {
            NodeToKeyMap::iterator i = newkeys.find(&node);
            if (i != newkeys.end()) {
//                g_log(NULL, G_LOG_LEVEL_DEBUG, "Found key for %p (local): %s", &node, i->second.c_str());
                  return i->second;
            } else {
                  std::string nodeid = this->_xnt->get(node);
                  if (nodeid.empty()) {
//                      g_log(NULL, G_LOG_LEVEL_DEBUG, "Generating key for %p", &node);
                        return this->_xnt->generateKey();
                  } else {
//                      g_log(NULL, G_LOG_LEVEL_DEBUG, "Found key for %p (tracker): %s", &node, nodeid.c_str());
                        return nodeid;
                  }
            }
      }

      KeyToNodeActionList newnodes;
      NodeTrackerEventTracker actions;
      NodeToKeyMap newkeys;
      XMLNodeTracker* _xnt;

private:
      // noncopyable, nonassignable
      NodeTrackerObserver(NodeTrackerObserver const& other);
      NodeTrackerObserver& operator=(NodeTrackerObserver const& other);

};

}

}
#endif

/*
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  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=c++:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :

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