| # Gaudi Framework, version v22r2 |

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# SmartDataObjectPtr Class Reference

A small class used to access easily (and efficiently) data items residing in data stores. More...

`#include <GaudiKernel/SmartDataObjectPtr.h>`

Inheritance diagram for SmartDataObjectPtr:
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Collaboration diagram for SmartDataObjectPtr:
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List of all members.

## Classes
class | ObjectFinder
| Helper class to configure smart pointer functionality. More...
class | ObjectLoader
| Helper class to configure smart pointer functionality. More...
## Public Types
typedef DataObject *(* | AccessFunction )(SmartDataObjectPtr *ptr)
## Public Member Functions
| SmartDataObjectPtr (AccessFunction access, IDataProviderSvc *pService, IRegistry *pDir, const std::string &path)
| Standard constructor: Construct an SmartDataObjectPtr instance.
| SmartDataObjectPtr (const SmartDataObjectPtr &copy)
| Copy constructor: Construct an copy of a SmartDataStorePtr instance.
virtual | ~SmartDataObjectPtr ()
| Standard Destructor.
virtual SmartDataObjectPtr & | operator= (const SmartDataObjectPtr &copy)
| Assignment operator.
| operator IRegistry * ()
| Automatic conversion to data directory.
const std::string & | path () const
| Path name.
IRegistry * | directory ()
| Access to data directory.
void | setService (IDataProviderSvc *svc)
| Assign data service.
IDataProviderSvc * | service ()
| Retrieve data service.
StatusCode | getLastError () const
| Access to potential errors during data accesses.
DataObject * | accessData ()
| Static Object retrieval method: must call specific function.
DataObject * | retrieveObject ()
| Object retrieve method.
DataObject * | findObject ()
| Object find method.
DataObject * | updateObject ()
| Object update method.
## Static Public Member Functions
static DataObject * | retrieve (SmartDataObjectPtr *ptr)
| Static Object retrieval method.
static DataObject * | find (SmartDataObjectPtr *ptr)
| Static Object find method.
static DataObject * | update (SmartDataObjectPtr *ptr)
| Static Object update method.
## Protected Member Functions
StatusCode | find (IRegistry *pDirectory, const std::string &path, DataObject *&refpObject)
| Find the specified object from the data store.
StatusCode | find (const std::string &fullPath, DataObject *&refpObject)
| Find the specified object from the data store.
StatusCode | retrieve (IRegistry *pDirectory, const std::string &path, DataObject *&refpObject)
| Retrieve the specified object from the data store.
StatusCode | retrieve (const std::string &fullPath, DataObject *&refpObject)
| Retrieve the specified object from the data store.
StatusCode | update (IRegistry *pDirectory)
| Update the specified object from the data store.
StatusCode | update (const std::string &fullPath)
| Update the specified object from the data store.
## Protected Attributes
IDataProviderSvc * | m_dataProvider
| Pointer to contained object.
IRegistry * | m_pRegistry
| Pointer to the data registry containing the object.
StatusCode | m_status
| Keep track of the last error.
std::string | m_path
| Path to object.
AccessFunction | m_accessFunc
| Data access function.

## Detailed Description

A small class used to access easily (and efficiently) data items residing in data stores.

The class is meant as configurable base class for real Smart pointer instances. Here mainly the access of the data store is handled. It is important to keep as less functions as possible NON-VIRTUAL in particular those, which handle the data access - they might be called very often and hence the compiler must be able to inline them.

Author:
  M.Frank

Version:
  1.0

Definition at line 33 of file SmartDataObjectPtr.h.

## Member Typedef Documentation

typedef DataObject*(* SmartDataObjectPtr::AccessFunction)(SmartDataObjectPtr *ptr)

Definition at line 35 of file SmartDataObjectPtr.h.

## Constructor & Destructor Documentation

SmartDataObjectPtr::SmartDataObjectPtr | ( | AccessFunction | access,
|  | IDataProviderSvc * | pService,
|  | IRegistry * | pDir,
|  | const std::string & | path
| ) |  | `[inline]`

Standard constructor: Construct an SmartDataObjectPtr instance.

Parameters:

  svc | Pointer to the data service interface used to interact with the store.
  pDir | Pointer to data directory
  path | path to object relative to data directory

Definition at line 55 of file SmartDataObjectPtr.h.

        : m_dataProvider(pService),
          m_pRegistry(pDir),
          m_status(StatusCode::SUCCESS,true),
          m_path(path),
          m_accessFunc(access)
      {
      }

SmartDataObjectPtr::SmartDataObjectPtr | ( | const SmartDataObjectPtr & | copy ) | `[inline]`

Copy constructor: Construct an copy of a SmartDataStorePtr instance.

Parameters:

  copy | Copy of Smart Pointer to object.

Definition at line 66 of file SmartDataObjectPtr.h.

        : m_dataProvider(copy.m_dataProvider),
          m_pRegistry(copy.m_pRegistry),
          m_status(copy.m_status),
          m_path(copy.m_path),
          m_accessFunc(copy.m_accessFunc)
      {
      }

virtual SmartDataObjectPtr::~SmartDataObjectPtr | ( | ) | `[inline, virtual]`

Standard Destructor.

Definition at line 75 of file SmartDataObjectPtr.h.

                                     {
      }

## Member Function Documentation

DataObject* SmartDataObjectPtr::accessData | ( | ) | `[inline]`

Static Object retrieval method: must call specific function.

Definition at line 111 of file SmartDataObjectPtr.h.

                                  {
        return m_accessFunc(this);
      }

IRegistry* SmartDataObjectPtr::directory | ( | ) | `[inline]`

Access to data directory.

Definition at line 91 of file SmartDataObjectPtr.h.

                                {
        return m_pRegistry;
      }

StatusCode SmartDataObjectPtr::find | ( | const std::string & | fullPath,
|  | DataObject *& | refpObject
| ) |  | `[protected]`

Find the specified object from the data store.

Retrieve the object from the data store.

Parameters:

  fullPath | String containing the full path necessary to locate the object.
  refpObject | Reference to the pointer finally holding the object

Returns:
  StatusCode indicating success or failure.

Definition at line 62 of file SmartDataObjectPtr.cpp.

                                                                                             {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider )    {
        status = m_dataProvider->findObject(fullPath, refpObject);
      }
      return status;
    }

static DataObject* SmartDataObjectPtr::find | ( | SmartDataObjectPtr * | ptr ) | `[inline, static]`

Static Object find method.

Definition at line 121 of file SmartDataObjectPtr.h.

                                                         {
        return ptr->findObject();
      }

StatusCode SmartDataObjectPtr::find | ( | IRegistry * | pDirectory,
|  | const std::string & | path,
|  | DataObject *& | refpObject
| ) |  | `[protected]`

Find the specified object from the data store.

Retrieve the object from the data store.

Parameters:

  pDirectory | Pointer to the directory entry holding the object.
  refpObject | Reference to the pointer finally holding the object

Returns:
  StatusCode indicating success or failure.

Definition at line 53 of file SmartDataObjectPtr.cpp.

                                                                                                                {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider && 0 != pDirectory )    {
        status = m_dataProvider->findObject(pDirectory, path, refpObject);
      }
      return status;
    }

DataObject * SmartDataObjectPtr::findObject | ( | ) |

Object find method.

If the object is not known to the local object, it is requested from the data service either using the full path if there is no directory information present.

Definition at line 109 of file SmartDataObjectPtr.cpp.

                                                 {
      DataObject* pObj = 0;
      m_status = (0==m_pRegistry) ? find(m_path,pObj) : find(m_pRegistry,m_path,pObj);
      if ( m_status.isSuccess() )   {
        m_pRegistry = pObj->registry();
        m_path = "";
      }
      return pObj;
    }

StatusCode SmartDataObjectPtr::getLastError | ( | ) | const`[inline]`

Access to potential errors during data accesses.

Definition at line 106 of file SmartDataObjectPtr.h.

                                          {
        return m_status;
      }

SmartDataObjectPtr::operator IRegistry * | ( | ) | `[inline]`

Automatic conversion to data directory.

Definition at line 81 of file SmartDataObjectPtr.h.

                               {
        return m_pRegistry;
      }

SmartDataObjectPtr & SmartDataObjectPtr::operator= | ( | const SmartDataObjectPtr & | copy ) | `[virtual]`

Assignment operator.

Reimplemented in SmartDataStorePtr< TYPE, LOADER >, and SmartDataStorePtr< TYPE, SmartDataObjectPtr::ObjectLoader >.

Definition at line 27 of file SmartDataObjectPtr.cpp.

                                                                                      {
      m_path          = copy.m_path;
      m_pRegistry     = copy.m_pRegistry;
      m_dataProvider  = copy.m_dataProvider;
      return *this;
    }

const std::string& SmartDataObjectPtr::path | ( | ) | const`[inline]`

Path name.

Definition at line 86 of file SmartDataObjectPtr.h.

                                        {
        return m_path;
      }

StatusCode SmartDataObjectPtr::retrieve | ( | const std::string & | fullPath,
|  | DataObject *& | refpObject
| ) |  | `[protected]`

Retrieve the specified object from the data store.

Retrieve the object from the data store.

Parameters:

  fullPath | String containing the full path necessary to locate the object.
  refpObject | Reference to the pointer finally holding the object

Returns:
  StatusCode indicating success or failure.

Definition at line 44 of file SmartDataObjectPtr.cpp.

                                                                                                 {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider )    {
        status = m_dataProvider->retrieveObject(fullPath, refpObject);
      }
      return status;
    }

static DataObject* SmartDataObjectPtr::retrieve | ( | SmartDataObjectPtr * | ptr ) | `[inline, static]`

Static Object retrieval method.

Definition at line 116 of file SmartDataObjectPtr.h.

                                                             {
        return ptr->retrieveObject();
      }

StatusCode SmartDataObjectPtr::retrieve | ( | IRegistry * | pDirectory,
|  | const std::string & | path,
|  | DataObject *& | refpObject
| ) |  | `[protected]`

Retrieve the specified object from the data store.

Retrieve the object from the data store.

Parameters:

  pDirectory | Pointer to the directory entry holding the object.
  refpObject | Reference to the pointer finally holding the object

Returns:
  StatusCode indicating success or failure.

Definition at line 35 of file SmartDataObjectPtr.cpp.

                                                                                                                   {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider && 0 != pRegistry )    {
        status = m_dataProvider->retrieveObject(pRegistry, path, refpObject);
      }
      return status;
    }

DataObject * SmartDataObjectPtr::retrieveObject | ( | ) |

Object retrieve method.

Object retrieval method.

If the object is not known to the local object, it is requested from the data service either using the full path if there is no directory information present.

Definition at line 94 of file SmartDataObjectPtr.cpp.

                                                     {
      DataObject* pObj = 0;
      m_status = (0==m_pRegistry) ? retrieve(m_path,pObj) : retrieve(m_pRegistry,m_path,pObj);
      if ( m_status.isSuccess() )   {
        m_pRegistry = pObj->registry();
        m_path = "";
      }
      return pObj;
    }

IDataProviderSvc* SmartDataObjectPtr::service | ( | ) | `[inline]`

Retrieve data service.

Definition at line 101 of file SmartDataObjectPtr.h.

                                     {
        return m_dataProvider;
      }

void SmartDataObjectPtr::setService | ( | IDataProviderSvc * | svc ) | `[inline]`

Assign data service.

Definition at line 96 of file SmartDataObjectPtr.h.

                                                  {
        m_dataProvider = svc;
      }

StatusCode SmartDataObjectPtr::update | ( | IRegistry * | pDirectory ) | `[protected]`

Update the specified object from the data store.

update the object from the data store.

Parameters:

  pDirectory | Pointer to the directory entry holding the object.

Returns:
  StatusCode indicating success or failure.

Definition at line 72 of file SmartDataObjectPtr.cpp.

                                                                 {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider && 0 != pRegistry )    {
        status = m_dataProvider->updateObject(pRegistry);
      }
      return status;
    }

static DataObject* SmartDataObjectPtr::update | ( | SmartDataObjectPtr * | ptr ) | `[inline, static]`

Static Object update method.

Definition at line 126 of file SmartDataObjectPtr.h.

                                                           {
        return ptr->updateObject();
      }

StatusCode SmartDataObjectPtr::update | ( | const std::string & | fullPath ) | `[protected]`

Update the specified object from the data store.

update the object from the data store.

Parameters:

  fullPath | String containing the full path necessary to locate the object.

Returns:
  StatusCode indicating success or failure.

Definition at line 81 of file SmartDataObjectPtr.cpp.

                                                                      {
      StatusCode status = StatusCode::FAILURE;
      if ( 0 != m_dataProvider )    {
        status = m_dataProvider->updateObject(fullPath);
      }
      return status;
    }

DataObject * SmartDataObjectPtr::updateObject | ( | ) |

Object update method.

If the object is not known to the local object, it is requested from the data service either using the full path if there is no directory information present. Needs to be virtual to to implicit object access.

If the object is not known to the local object, it is requested from the data service either using the full path if there is no directory information present.

Definition at line 124 of file SmartDataObjectPtr.cpp.

                                                   {
      DataObject* pObj = accessData();    // Have to load AND update if not present.
      if ( m_status.isSuccess() )   {
        m_status = (0 == m_pRegistry) ? update(m_path) : update(m_pRegistry);
        if ( !m_status.isSuccess() )  pObj = 0;
      }
      return pObj;
    }

## Member Data Documentation

AccessFunction SmartDataObjectPtr::m_accessFunc`[protected]`

Data access function.

Definition at line 202 of file SmartDataObjectPtr.h.

IDataProviderSvc* SmartDataObjectPtr::m_dataProvider`[mutable, protected]`

Pointer to contained object.

Definition at line 194 of file SmartDataObjectPtr.h.

std::string SmartDataObjectPtr::m_path`[protected]`

Path to object.

Definition at line 200 of file SmartDataObjectPtr.h.

IRegistry* SmartDataObjectPtr::m_pRegistry`[mutable, protected]`

Pointer to the data registry containing the object.

Definition at line 196 of file SmartDataObjectPtr.h.

StatusCode SmartDataObjectPtr::m_status`[mutable, protected]`

Keep track of the last error.

Definition at line 198 of file SmartDataObjectPtr.h.

The documentation for this class was generated from the following files:

- /afs/.cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r2/GaudiKernel/GaudiKernel/SmartDataObjectPtr.h
- /afs/.cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r2/GaudiKernel/src/Lib/SmartDataObjectPtr.cpp

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