-- File:	CDM_Application.cdl
-- Created:	Wed Oct 22 15:05:47 1997
-- Author:	Jean-Louis Frenkel
--		<rmi@frilox.paris1.matra-dtv.fr>
---Copy:	 Matra Datavision 1997

deferred class Application from CDM inherits Transient from Standard

uses Document           from CDM,
     MetaData           from CDM,
     Reference          from CDM,
     MessageDriver      from CDM,
     Manager            from Resource,
     ExtendedString     from TCollection
is

    Retrieve(me: mutable; aMetaData: MetaData from CDM; UseStorageConfiguration: Boolean from Standard)
    returns mutable Document from CDM
    is deferred private;


    DocumentVersion(me: mutable; aMetaData: MetaData from CDM)
    returns Integer from Standard
    is deferred private;
    ---Purpose: returns -1 if the metadata has no modification counter.
    
    SetDocumentVersion(me; aDocument: Document from CDM; aMetaData: MetaData from CDM)
    is protected;

    SetReferenceCounter(me:mutable ; aDocument: Document from CDM; aReferenceCounter: Integer from Standard)
    is protected;
    
    Resources(me: mutable)
    returns Manager from Resource
    is deferred;
    ---Purpose: the manager returned by  this virtual  method will be
    --          used to search for Format`.Retrieval  resource items. 
    --          
    
    MessageDriver(me: mutable) returns MessageDriver from CDM
    is virtual;
    ---Purpose: By default returns a NullMessageDriver;

    BeginOfUpdate(me:mutable; aDocument: Document from CDM)
    is virtual;
    ---Purpose: this method is called before the update of a document.
    --         By default, writes in MessageDriver().

    EndOfUpdate(me:mutable; aDocument: Document from CDM; Status: Boolean from Standard; ErrorString: ExtendedString from TCollection)
    is virtual;
    ---Purpose: this method is called affter the update of a document.
    --         By default, writes in MessageDriver().

    Write(me: mutable; aString: ExtString from Standard);
    ---Purpose: writes the string in the application MessagerDriver.

friends     

    class Reference from CDM,
    class MetaData from CDM

end Application from CDM;