rdf/base/idl/nsIRDFObserver.idl
author Shawn Wilsher <sdwilsh@shawnwilsher.com>
Fri, 20 Mar 2009 18:41:01 -0400
changeset 26429 514e4089924d889c7a2dcecd0e081ab55bd4e2e2
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 98529 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Bug 483157 - mozStorageStatementRow needs to use mozIStorageStatement API This makes our language helper use public API instead of calling SQLite directly, which centralizes some of our logic. r=asuth r=bent

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#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);
};