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Public Types | Public Member Functions | List of all members
IConverter Class Referenceabstract

The data converters are responsible to translate data from one representation into another. More...

`#include <GaudiKernel/IConverter.h>`

Inheritance diagram for IConverter:
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Collaboration diagram for IConverter:
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## Public Types
enum | Status { INVALID_ADDRESS = IInterface::LAST_ERROR+1, INVALID_OBJECT, NO_MEMORY, BAD_STORAGE_TYPE, NO_SOURCE_OBJECT, ICONVERSIONSVC_LAST_ERROR }
| Status code. More...
Public Types inherited from IInterface
enum | Status { SUCCESS = 1, NO_INTERFACE, VERSMISMATCH, LAST_ERROR }
| Return status. More...
using | iid = Gaudi::InterfaceId< IInterface, 0, 0 >
| Interface ID. More...
using | ext_iids = Gaudi::interface_list< iid >
| Extra interfaces. More...

## Public Member Functions
| DeclareInterfaceID (IConverter, 3, 0)
| InterfaceID. More...
virtual StatusCode | initialize ()=0
| Initialize the converter. More...
virtual StatusCode | finalize ()=0
| Terminate the converter. More...
virtual const CLID & | objType () const =0
| Retrieve the class type of objects the converter produces. More...
virtual long | repSvcType () const =0
| Retrieve the class type of the data store the converter uses. More...
virtual StatusCode | setDataProvider (IDataProviderSvc *pService)=0
| Set Data provider service. More...
virtual SmartIF< IDataProviderSvc > & | dataProvider () const =0
| Get Data provider service. More...
virtual StatusCode | setConversionSvc (IConversionSvc *pService)=0
| Set conversion service the converter is connected to. More...
virtual SmartIF< IConversionSvc > & | conversionSvc () const =0
| Get conversion service the converter is connected to. More...
virtual StatusCode | setAddressCreator (IAddressCreator *creator)=0
| Set address creator facility. More...
virtual SmartIF< IAddressCreator > & | addressCreator () const =0
| Get address creation interface needed to resolve links between objects. More...
virtual StatusCode | createObj (IOpaqueAddress *pAddress, DataObject *&refpObject)=0
| Create the transient representation of an object. More...
virtual StatusCode | fillObjRefs (IOpaqueAddress *pAddress, DataObject *pObject)=0
| Resolve the references of the created transient object. More...
virtual StatusCode | updateObj (IOpaqueAddress *pAddress, DataObject *refpObject)=0
| Update the transient object from the other representation. More...
virtual StatusCode | updateObjRefs (IOpaqueAddress *pAddress, DataObject *pObject)=0
| Update the references of an updated transient object. More...
virtual StatusCode | createRep (DataObject *pObject, IOpaqueAddress *&refpAddress)=0
| Convert the transient object to the requested representation. More...
virtual StatusCode | fillRepRefs (IOpaqueAddress *pAddress, DataObject *pObject)=0
| Resolve the references of the converted object. More...
virtual StatusCode | updateRep (IOpaqueAddress *pAddress, DataObject *pObject)=0
| Update the converted representation of a transient object. More...
virtual StatusCode | updateRepRefs (IOpaqueAddress *pAddress, DataObject *pObject)=0
| Update the references of an already converted object. More...
Public Member Functions inherited from IInterface
virtual void * | i_cast (const InterfaceID &) const =0
| main cast function More...
virtual std::vector< std::string > | getInterfaceNames () const =0
| Returns a vector of strings containing the names of all the implemented interfaces. More...
virtual unsigned long | addRef ()=0
| Increment the reference count of Interface instance. More...
virtual unsigned long | release ()=0
| Release Interface instance. More...
virtual unsigned long | refCount () const =0
| Current reference count. More...
virtual StatusCode | queryInterface (const InterfaceID &ti, void **pp)=0
| Set the void** to the pointer to the requested interface of the instance. More...
virtual | ~IInterface ()=default
| Virtual destructor. More...

## Additional Inherited Members
Static Public Member Functions inherited from IInterface
static const InterfaceID & | interfaceID ()
| Return an instance of InterfaceID identifying the interface. More...

## Detailed Description

The data converters are responsible to translate data from one representation into another.

Concrete examples are e.g. converters creating transient objects representing parts of an event from the persistent (and disk based) representations. Converters will have to deal with the technology both representations are based on: in the upper example they have to know about the database internals as well as the structure of the transient representations. The converters know about the mechanism to retrieve persistent objects (ZEBRA, Objectivity, ) and only pass abstract instances of the converted objects, hence shielding the calling service from internals.

Data converters are meant to be light. This means there should not be all-in-one converters, which are able to convert the "world", but rather many converters. Each converter is then able to create a representation of a given type.

In order to function a converter must be able to

- Answer (when asked) which kind of representation the converter is able to create.
- Retrieve the source object from the source store.
- Create the requested representation using the information contained in the source object.
- Inform the registry entry of the created object that the object is now loaded.
- This registry entry is located in the data store which is supposed to manage the requested object.
- Register all leafs of the created object with the data store which is supposed to manage the requested object. Registering does not mean to create these representations, but rather to inform about the existence.

The interface should cover the entry points of concrete converter instances in order to serve conversion requests.

Author
  Markus Frank

Version
  1.0

Definition at line 57 of file IConverter.h.

## Member Enumeration Documentation

enum IConverter::Status

Status code.

Enumerator
INVALID_ADDRESS | Invalid address information.
INVALID_OBJECT | Object to be converted is invalid.
NO_MEMORY | No more memory available.
BAD_STORAGE_TYPE | Invalid storage type.
NO_SOURCE_OBJECT | Error retrieving source data from source store.
ICONVERSIONSVC_LAST_ERROR | Last entry.

Definition at line 200 of file IConverter.h.

200 {
202 INVALID_ADDRESS = IInterface::LAST_ERROR+1,
204 INVALID_OBJECT,
206 NO_MEMORY,
208 BAD_STORAGE_TYPE,
210 NO_SOURCE_OBJECT,
212 ICONVERSIONSVC_LAST_ERROR
213 };
IConverter::INVALID_ADDRESS
Invalid address information.
Definition: IConverter.h:202
IConverter::NO_SOURCE_OBJECT
Error retrieving source data from source store.
Definition: IConverter.h:210
IConverter::INVALID_OBJECT
Object to be converted is invalid.
Definition: IConverter.h:204
IConverter::BAD_STORAGE_TYPE
Invalid storage type.
Definition: IConverter.h:208
IConverter::ICONVERSIONSVC_LAST_ERROR
Last entry.
Definition: IConverter.h:212
IConverter::NO_MEMORY
No more memory available.
Definition: IConverter.h:206
IInterface::LAST_ERROR
Last error.
Definition: IInterface.h:291

## Member Function Documentation

virtual SmartIF<IAddressCreator>& IConverter::addressCreator | ( |  | ) | const
| pure virtual

Get address creation interface needed to resolve links between objects.

Returns
  Pointer to IAddressCreator interface

virtual SmartIF<IConversionSvc>& IConverter::conversionSvc | ( |  | ) | const
| pure virtual

Get conversion service the converter is connected to.

Returns
  Pointer to IConversionSvc interface

virtual StatusCode IConverter::createObj | ( | IOpaqueAddress * | pAddress,
|  | DataObject *& | refpObject
| ) |  |
| pure virtual

Create the transient representation of an object.

The transient representation is created by loading the persistent object using the source information contained in the address.

Returns
  Status code indicating success or failure

Parameters

  pAddress | Opaque address information to retrieve the requested object from the store in order to produce the transient object.
  refpObject | Reference to location of pointer of the created object.

virtual StatusCode IConverter::createRep | ( | DataObject * | pObject,
|  | IOpaqueAddress *& | refpAddress
| ) |  |
| pure virtual

Convert the transient object to the requested representation.

e.g. conversion to persistent objects.

Returns
  Status code indicating success or failure

Parameters

  pObject | Pointer to location of the object
  refpAddress | Reference to location of pointer with the object address.

virtual SmartIF<IDataProviderSvc>& IConverter::dataProvider | ( |  | ) | const
| pure virtual

Get Data provider service.

Returns
  Pointer to data provider service

IConverter::DeclareInterfaceID | ( | IConverter | ,
|  | 3 | ,
|  | 0 |
| ) |  |

InterfaceID.

virtual StatusCode IConverter::fillObjRefs | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | pObject
| ) |  |
| pure virtual

Resolve the references of the created transient object.

After the object creation references of the objects pointing to objects outside its scope will have to be filled. The actual objects will not be loaded, but the recipe to load them will be present.

Returns
  Status code indicating success or failure

Parameters

  pAddress | Opaque address information to retrieve the requested object from the store.
  pObject | Pointer to location of the object

virtual StatusCode IConverter::fillRepRefs | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | pObject
| ) |  |
| pure virtual

Resolve the references of the converted object.

After the requested representation was created the references in this representation must be resolved.

Returns
  Status code indicating success or failure

Parameters

  pObject | Pointer to location of the object

virtual StatusCode IConverter::finalize | ( |  | ) |
| pure virtual

Terminate the converter.

Returns
  Status code indicating success or failure

Exceptions

  exception | (STL standard) in case of fatal errors

virtual StatusCode IConverter::initialize | ( |  | ) |
| pure virtual

Initialize the converter.

Returns
  Status code indicating success or failure

Exceptions

  exception | (STL standard) in case of fatal errors

virtual const CLID& IConverter::objType | ( |  | ) | const
| pure virtual

Retrieve the class type of objects the converter produces.

Returns
  Class type of the created object.

virtual long IConverter::repSvcType | ( |  | ) | const
| pure virtual

Retrieve the class type of the data store the converter uses.

Returns
  Class type information about the source data store type the converter will use to retrieve the information.

virtual StatusCode IConverter::setAddressCreator | ( | IAddressCreator * | creator | ) |
| pure virtual

Set address creator facility.

Parameters

  creator | Reference to address creator interface

Returns
  Status code indicating success or failure.

virtual StatusCode IConverter::setConversionSvc | ( | IConversionSvc * | pService | ) |
| pure virtual

Set conversion service the converter is connected to.

Returns
  Status code indicating success or failure

Parameters

  pService | Pointer to IConversionSvc interface

virtual StatusCode IConverter::setDataProvider | ( | IDataProviderSvc * | pService | ) |
| pure virtual

Set Data provider service.

Returns
  Status code indicating success or failure

Parameters

  pService | Pointer to data provider service

virtual StatusCode IConverter::updateObj | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | refpObject
| ) |  |
| pure virtual

Update the transient object from the other representation.

The transient representation will be updated by loading the persistent object using the source information contained in the address and then refill transient data.

Returns
  Status code indicating success or failure

Parameters

  pAddress | Opaque address information to retrieve the requested object from the store.
  pObject | Pointer to the object to be updated.

virtual StatusCode IConverter::updateObjRefs | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | pObject
| ) |  |
| pure virtual

Update the references of an updated transient object.

After the object was updated also the references of the objects pointing to objects outside its scope will have to be filled. The actual pointers to objects will only be filled if already present. Otherwise only the recipe to load them will be present.

Returns
  Status code indicating success or failure

Parameters

  pAddress | Opaque address information to retrieve the requested object from the store.
  pObject | Pointer to location of the object

virtual StatusCode IConverter::updateRep | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | pObject
| ) |  |
| pure virtual

Update the converted representation of a transient object.

Returns
  Status code indicating success or failure

Parameters

  pObject | Pointer to location of the object
  refpAddress | Reference to location of pointer with the object address.

virtual StatusCode IConverter::updateRepRefs | ( | IOpaqueAddress * | pAddress,
|  | DataObject * | pObject
| ) |  |
| pure virtual

Update the references of an already converted object.

The object must be retrieved before it can be updated.

Returns
  Status code indicating success or failure

Parameters

  pAddress | Pointer to location of object address with the store.
  pObject | Pointer to location of the object

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

- GaudiKernel/GaudiKernel/IConverter.h