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-- File: CDF_MetaDataDriver.cdl
-- Created: Mon Nov 17 16:41:35 1997
-- Author: Jean-Louis Frenkel
-- <rmi@frilox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1997
deferred class MetaDataDriver from CDF inherits Transient from Standard
uses
Document from CDM, MetaData from CDM,
ExtendedString from TCollection,
ReferenceIterator from PCDM
raises
NotImplemented from Standard
is
Initialize;
---Category: virtual methods
HasVersionCapability(me: mutable)
---Purpose: returns true if the MetaDataDriver can manage different
-- versions of a Data.
-- By default, returns Standard_False.
returns Boolean from Standard
is virtual;
CreateDependsOn(me: mutable; aFirstData: MetaData from CDM;
aSecondData: MetaData from CDM)
---Purpose: Creates a "Depends On" relation between two Datas.
-- By default does nothing
is virtual;
CreateReference(me: mutable; aFrom, aTo: MetaData from CDM; aReferenceIdentifier: Integer from Standard; aToDocumentVersion: Integer from Standard)
is virtual;
HasVersion(me: mutable; aFolder, aName: ExtendedString from TCollection)
returns Boolean from Standard
---Purpose: by default return Standard_True.
is virtual;
BuildFileName(me: mutable; aDocument: Document from CDM)
returns ExtendedString from TCollection
is deferred;
SetName(me: mutable; aDocument: Document from CDM; aName: ExtendedString from TCollection)
returns ExtendedString from TCollection
is virtual;
---Purpose: this methods is usefull if the name of an object --
-- depends on the metadatadriver. For example a Driver
-- -- based on the operating system can choose to add
-- the extension of file to create to the object.
---Category: Deferred methods
---Overview: inquiring can be made either using a folder, a name and eventually
-- a version
-- or a path which is the concatenation of a folder, a name and eventually
-- a version.
Find(me: mutable; aFolder, aName, aVersion: ExtendedString from TCollection)
returns Boolean from Standard
---Purpose: should indicate whether meta-data exist in the DBMS corresponding
-- to the Data.
-- aVersion may be NULL;
is deferred;
HasReadPermission(me: mutable; aFolder, aName, aVersion: ExtendedString from TCollection)
returns Boolean from Standard
is deferred;
MetaData(me: mutable; aFolder, aName, aVersion: ExtendedString from TCollection)
returns MetaData from CDM
---Purpose: should return the MetaData stored in the DBMS with the meta-data
-- corresponding to the Data. If the MetaDataDriver has version management capabilities
-- the version has to be set in the returned MetaData.
-- aVersion may be NULL
-- MetaData is called by GetMetaData
-- If the version is set to NULL, MetaData should return
-- the last version of the metadata
is deferred;
LastVersion(me: mutable; aMetaData: MetaData from CDM)
returns MetaData from CDM
is virtual;
---Purpose: by default returns aMetaDATA
-- MetaData(me: mutable; aPath: ExtendedString from TCollection)
-- returns MetaData from CDM
---Purpose: should return the MetaData stored in the DBMS with the meta-data
-- corresponding to the path. If the MetaDataDriver has version management capabilities
-- the version has to be set in the returned MetaData.
-- MetaData is called by GetMetaData
-- If the version is not included in the path , MetaData should return
-- the last version of the metadata
-- is deferred;
CreateMetaData(me: mutable; aDocument: Document from CDM;
aFileName: ExtendedString from TCollection)
---Purpose: should create meta-data corresponding to aData and maintaining a meta-link
-- between these meta-data and aFileName
-- CreateMetaData is called by CreateData
returns MetaData from CDM
---Purpose: If the metadata-driver
-- has version capabilities, version must be set in the returned Data.
is deferred;
FindFolder(me: mutable; aFolder: ExtendedString from TCollection)
returns Boolean from Standard
is deferred;
DefaultFolder(me: mutable) returns ExtendedString from TCollection
is deferred;
---Category: methods about references.
ReferenceIterator(me: mutable)
returns ReferenceIterator from PCDM
is virtual;
Find(me: mutable; aFolder, aName: ExtendedString from TCollection)
returns Boolean from Standard;
---Purpose: calls Find with an empty version
MetaData(me: mutable; aFolder, aName: ExtendedString from TCollection)
returns MetaData from CDM;
---Purpose: calls MetaData with an empty version
end MetaDataDriver from CDF;
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