LinkManager.h

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#ifndef GAUDIKERNEL_LINKMANAGER_H
#define GAUDIKERNEL_LINKMANAGER_H

// STL includes
#include <vector>
#include <string>
// Gaudi
#include "GaudiKernel/Kernel.h"

class DataObject;
class IOpaqueAddress;

class GAUDI_API LinkManager {

public:
  enum DirLinkType {INVALID, VALID};

  class Link  {
    friend class LinkManager;
  protected:
    std::string m_path;
    DataObject* m_pObject;
    long        m_id;
  public:
    Link(long id, const std::string& path, const DataObject* pObject=0)
    : m_path(path), m_id(id) {
      setObject(pObject);
    }
    Link() : m_path(""), m_pObject(0), m_id(INVALID) {
    }
    Link& operator=(const Link& link)  {
      setObject(link.m_pObject);
      m_path = link.m_path;
      m_id   = link.m_id;
      return *this;
    }
    virtual ~Link() {
    }
    void set(long id, const std::string& path, const DataObject* pObject)   {
      setObject(pObject);
      m_path = path;
      m_id   = id;
    }
    bool operator==(const Link& link)  const  {
      return link.m_path == m_path;
    }
    void setObject(const DataObject* pObject)   {
      m_pObject = const_cast<DataObject*>(pObject);
    }
    DataObject* object()  const  {
      return m_pObject;
    }
    const std::string& path()   const   {
      return m_path;
    }
    long ID()  const    {
      return m_id;
    }
    virtual IOpaqueAddress* address();
  };
  typedef std::vector<Link*>           LinkVector;
  typedef LinkVector::iterator         LinkIterator;
  typedef LinkVector::const_iterator   ConstLinkIterator;

  mutable LinkVector m_linkVector;

public:
  LinkManager();
  virtual ~LinkManager();
  static LinkManager* newInstance();
  static void setInstantiator( LinkManager* (*newInstance)() );
  long size()   const   {
    return m_linkVector.size();
  }
  Link* link(long id);
  Link* link(const DataObject* pObject);
  Link* link(const std::string& path);
  long addLink(const std::string& path, const DataObject* pObject)   const;
  long removeLink(const DataObject* pObject)   const;
  long removeLink(const std::string& fullPath)   const;
  long removeLink(long id)   const;
  void clearLinks();
};
#endif // GAUDIKERNEL_LINKMANAGER_H