/******************************************************************************/
/* File: request.beh                                                          */
/*                                                                            */
/* Describes the Request object that represents the structure of the query /  */
/* insert request submitted to this process. The components of the request    */
/* are extracted from it using a RequestProcessingVisitor that traverses the  */
/* structure to construct separate object structures to represent each        */
/* individual component.                                                      */
/* These components are:                                                      */
/*     the connection arguments,                                              */
/*     the request type (Query / Insert),                                     */
/*     the target data structure - table(s) and corresponding column(s),      */
/*     the generated SQL statement for submitting the request to the DBMS,    */
/*     the object hierarchy structure requested.                              */
/* The processing-visitor returns all the components as a vector of objects.  */
/* A public accessor method is provided in this class for each component.     */
/*                                                                            */
/******************************************************************************/

Request
{
    {{
    private Vector requestDetails = null;

    public ConnectionArgs getConnectionArgs(ClassGraph cg)
    {
	getRequestDetails(cg);
	return (ConnectionArgs) requestDetails.elementAt(0);
    }

    public String getRequestType(ClassGraph cg)
    {
	getRequestDetails(cg);
	return (String) requestDetails.elementAt(1);
    }

    public EntityStructure[] getEntityStructure(ClassGraph cg)
    {
	getRequestDetails(cg);
	return (EntityStructure[]) requestDetails.elementAt(2);
    }

    public String getSQLStmt(ClassGraph cg)
    {
	getRequestDetails(cg);
	return (String) requestDetails.elementAt(3);
    }

    public HierarchyArgs getHierarchyArgs(ClassGraph cg)
    {
	getRequestDetails(cg);
	return (HierarchyArgs) requestDetails.elementAt(4);
    }


    private void getRequestDetails(ClassGraph cg)
    {
	if (requestDetails == null)
	{
	    TraversalGraph tg = new TraversalGraph("from Request to *", cg);
	    requestDetails =
		(Vector) tg.traverse(this, new RequestProcessingVisitor());
	}
    }

    }}
}