DataObjID.h

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#ifndef GAUDIKERNEL_DATAOBJID
#define GAUDIKERNEL_DATAOBJID 1

#include "GaudiKernel/ClassID.h"
#include "GaudiKernel/StatusCode.h"

#include <string>
#include <unordered_set>
#include <iostream>
#include <mutex>

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------


struct DataObjID_Hasher;
class IClassIDSvc;

class DataObjID {
public:
  friend DataObjID_Hasher;

  DataObjID() {};
  DataObjID(const std::string& key);
  DataObjID(const CLID& clid, const std::string& key);
  DataObjID(const std::string& className, const std::string& key);
  DataObjID(const DataObjID&) = default;

  // only return the last part of the key
  const std::string& key() const { return m_key; }

  // combination of the key and the ClassName, mostly for debugging
  std::string fullKey() const;

  CLID clid() const { return m_clid; }

  void updateKey(const std::string& key);

  friend std::ostream& operator<< (std::ostream& str, const DataObjID& d);

  friend bool operator< (const DataObjID& lhs, const DataObjID& rhs ) {
    return lhs.m_hash < rhs.m_hash;
  }

  friend bool operator==(const DataObjID& lhs,  const DataObjID& rhs ) {
    return lhs.m_hash == rhs.m_hash;
  }

  friend bool operator!=(const DataObjID& lhs,  const DataObjID& rhs ) {
    return !( lhs == rhs );
  }

private:

  void hashGen();
  void parse(const std::string& key);
  void setClid();
  void setClassName();

  CLID m_clid {0};
  std::size_t m_hash {0};

  std::string m_className {""};
  std::string m_key {"INVALID"};

  static void getClidSvc();
  static IClassIDSvc* p_clidSvc;
  static std::once_flag m_ip;

};

inline DataObjID::DataObjID(const std::string& key):
  m_key(key) {
  hashGen();

}

inline DataObjID::DataObjID(const CLID& clid, const std::string& key):
  m_clid(clid), m_key(key) {
  setClassName();
  hashGen();
}

inline DataObjID::DataObjID(const std::string& className, const std::string& key):
  m_className(className), m_key(key) {
  setClid();
  hashGen();
}

inline void DataObjID::updateKey(const std::string& key) {
  m_key = key;
  hashGen();
}

struct DataObjID_Hasher {
  std::size_t operator()(const DataObjID& k) const {
    return k.m_hash;
  }
};

typedef std::unordered_set<DataObjID, DataObjID_Hasher> DataObjIDColl;

namespace Gaudi {
  namespace Parsers {
    StatusCode parse(DataObjID&, const std::string&);
    StatusCode parse(DataObjIDColl&, const std::string&);
  }
  namespace Utils {
    GAUDI_API std::ostream& toStream(const DataObjID& v, std::ostream& o);
    GAUDI_API std::ostream& toStream(const DataObjIDColl& v, std::ostream& o);
  }
}


#endif