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-- File: PCDM_StorageDriver.cdl
-- Created: Mon Nov 3 10:09:25 1997
-- Author: Jean-Louis Frenkel
-- <rmi@frilox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1997
deferred class StorageDriver from PCDM inherits Writer from PCDM
---Purpose: persistent implemention of storage.
--
-- The application must redefine one the two Make()
-- methods. The first one, if the application wants to
-- put only one document in the storage file.
--
-- The second method should be redefined to put
-- additional document that could be used by the
-- retrieval instead of the principal document, depending
-- on the schema used during the retrieval. For example,
-- a second document could be a standard
-- CDMShape_Document. This means that a client
-- application will already be able to extract a CDMShape_Document
-- of the file, if the Shape Schema remains unchanged.
--
---Category: persistent implemention of storage.
uses
Document from CDM,
Document from PCDM,
Data from Storage,
ExtendedString from TCollection,
Schema from Storage,
SequenceOfExtendedString from TColStd,
SequenceOfDocument from PCDM,
StoreStatus from PCDM
raises NoSuchObject from Standard,DriverError from PCDM
is
Make(me: mutable; aDocument: Document from CDM)
returns Document from PCDM
is virtual;
---Purpose: raises NotImplemented.
Make(me: mutable; aDocument: Document from CDM; Documents: out SequenceOfDocument from PCDM)
is virtual;
---Purpose:By default, puts in the Sequence the document returns
-- by the previous Make method.
--
--
SchemaName(me) returns ExtendedString from TCollection
is deferred;
LoadExtensions(me: mutable; aSchema: Schema from Storage; Extensions: SequenceOfExtendedString from TColStd)
is virtual;
Write(me: mutable; aDocument: Document from CDM; aFileName: ExtendedString from TCollection)
raises DriverError
---Purpose: Warning! raises DriverError if an error occurs during inside the
-- Make method.
is redefined virtual;
---Purpose: stores the content of the Document into a new file.
--
-- by default Write will use Make method to build a persistent
-- document and the Schema method to write the persistent document.
--
SetFormat (me : mutable; aformat : ExtendedString from TCollection);
GetFormat (me)
returns ExtendedString from TCollection;
IsError (me) returns Boolean from Standard;
SetIsError(me : mutable; theIsError : Boolean);
GetStoreStatus (me) returns StoreStatus from PCDM;
SetStoreStatus(me : mutable; theStoreStatus : StoreStatus from PCDM);
fields
myFormat : ExtendedString from TCollection;
myIsError: Boolean from Standard;
myStoreStatus: StoreStatus from PCDM;
end StorageDriver from PCDM;
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