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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

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

interface nsIRDFDataSource;

// 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
     * @param aDataSource the datasource that is issuing
     *   the notification.
     * @param aSource the subject of the assertion
     * @param aProperty the predicate of the assertion
     * @param aTarget the object of the assertion
     */
    void onAssert(in nsIRDFDataSource aDataSource,
                  in nsIRDFResource aSource,
                  in nsIRDFResource aProperty,
                  in nsIRDFNode     aTarget);

    /**
     * This method is called whenever an assertion is removed
     * from the data source
     * @param aDataSource the datasource that is issuing
     *   the notification.
     * @param aSource the subject of the assertion
     * @param aProperty the predicate of the assertion
     * @param aTarget the object of the assertion
     */
    void onUnassert(in nsIRDFDataSource aDataSource,
                    in nsIRDFResource aSource,
                    in nsIRDFResource aProperty,
                    in nsIRDFNode     aTarget);

    /**
     * This method is called when the object of an assertion
     * changes from one value to another.
     * @param aDataSource the datasource that is issuing
     *   the notification.
     * @param aSource the subject of the assertion
     * @param aProperty the predicate of the assertion
     * @param aOldTarget the old object of the assertion
     * @param aNewTarget the new object of the assertion
     */
    void onChange(in nsIRDFDataSource aDataSource,
                  in nsIRDFResource aSource,
                  in nsIRDFResource aProperty,
                  in nsIRDFNode     aOldTarget,
                  in nsIRDFNode     aNewTarget);

    /**
     * This method is called when the subject of an assertion
     * changes from one value to another.
     * @param aDataSource the datasource that is issuing
     *   the notification.
     * @param aOldSource the old subject of the assertion
     * @param aNewSource the new subject of the assertion
     * @param aProperty the predicate of the assertion
     * @param aTarget the object of the assertion
     */
    void onMove(in nsIRDFDataSource aDataSource,
                in nsIRDFResource aOldSource,
                in nsIRDFResource aNewSource,
                in nsIRDFResource aProperty,
                in nsIRDFNode     aTarget);

    /**
     * This method is called when a datasource is about to
     * send several notifications at once. The observer can
     * use this as a cue to optimize its behavior. The observer
     * can expect the datasource to call endUpdateBatch() when
     * the group of notifications has completed.
     * @param aDataSource the datasource that is going to
     *   be issuing the notifications.
     */
    void onBeginUpdateBatch(in nsIRDFDataSource aDataSource);

    /**
     * This method is called when a datasource has completed
     * issuing a notification group.
     * @param aDataSource the datasource that has finished
     *   issuing a group of notifications
     */
    void onEndUpdateBatch(in nsIRDFDataSource aDataSource);
};