-- File:	DDF_Transaction.cdl
--      	-------------------
-- Author:	DAUTRY Philippe
--		<fid@fox.paris1.matra-dtv.fr>
---Copyright:	 MATRA DATAVISION 1997

---Version:	0.0
---History:	Version	Date		Purpose
--		0.0	Nov  4 1997	Creation

class Transaction from DDF
    inherits TShared from MMgt

	---Purpose: This class encapsulates TDF_Transaction.

uses

    Data  from TDF,
    Delta from TDF,
    Transaction from TDF

raises

    DomainError, NullObject from Standard

is

    Create
    	returns Transaction from DDF;
	---Purpose: Creates an empty transaction context, unable to be
	--          opened.

    Create(aDF : Data from TDF)
    	returns Transaction from DDF;
	---Purpose: Creates a transaction context on <aDF>, ready to
	--          be opened.

    Open(me : mutable)
    	returns Integer from Standard;
	---Purpose: If not yet done, opens a new transaction on
	--          <myDF>. Returns the index of the just opened
	--          transaction.
	--          
	--          It raises DomainError if the transaction is
	--          already open, and NullObject if there is no
	--          current Data framework.

    Commit(me : mutable;
    	   withDelta : Boolean from Standard = Standard_False)
    	returns Delta from TDF;
	---Purpose: Commits the transactions until AND including the
	--          current opened one.

    Abort(me : mutable);
	---Purpose: Aborts the transactions until AND including the
	--          current opened one.
	--          
	---C++: alias ~

    Data(me) returns Data from TDF;
	---Purpose: Returns the Data from TDF.

    Transaction(me) returns Integer from Standard;
	---Purpose: Returns the number of the transaction opened by <me>.

    IsOpen(me)
    	returns Boolean from Standard;
	---Purpose: Returns true if the transaction is open.


fields

    myTransaction : Transaction from TDF;

end Transaction;