gecko-dev/rdf/base/idl/nsIRDFObserver.idl

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#include "nsISupports.idl"
#include "nsIRDFResource.idl"
#include "nsIRDFNode.idl"

// An nsIRDFObserver object is an observer that will be notified
// when assertions are made or removed from a datasource
[scriptable, uuid(3CC75360-484A-11D2-BC16-00805F912FE7)]
interface nsIRDFObserver : nsISupports {
    // This method is called whenever a new assertion is made
    // in the data source
    void OnAssert(in nsIRDFResource aSource,
                  in nsIRDFResource aProperty,
                  in nsIRDFNode     aTarget);

    // This method is called whenever an assertion is removed
    // from the data source
    void OnUnassert(in nsIRDFResource aSource,
                    in nsIRDFResource aProperty,
                    in nsIRDFNode     aTarget);

    void OnChange(in nsIRDFResource aSource,
                  in nsIRDFResource aProperty,
                  in nsIRDFNode     aOldTarget,
                  in nsIRDFNode     aNewTarget);

    void OnMove(in nsIRDFResource aOldSource,
                in nsIRDFResource aNewSource,
                in nsIRDFResource aProperty,
                in nsIRDFNode     aTarget);
};