michael@0: /* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsISupports.idl"
michael@0: 
michael@0: interface nsIRDFResource;
michael@0: interface nsIRDFNode;
michael@0: 
michael@0: /**
michael@0:  * Interface used in RDF to enumerate triples.
michael@0:  * Also used by rdfIDataSource::getAllSubjects, then aPredicate,
michael@0:  * aObject and aTruthValue are ignored.
michael@0:  *
michael@0:  * @status PLASMA
michael@0:  */
michael@0: 
michael@0: [scriptable, function, uuid(aafea151-c271-4505-9978-a100d292800c)]
michael@0: interface rdfITripleVisitor : nsISupports
michael@0: {
michael@0:     /**
michael@0:      * Callback function for returning query results.
michael@0:      *
michael@0:      * @param aSubject, aPredicate, aObject describe the (sub-)arc
michael@0:      * @returnCode NS_RDF_STOP_VISIT to stop iterating over the query result.
michael@0:      *             Any error code will stop the iteration as well.
michael@0:      */
michael@0:     void visit(in nsIRDFNode aSubject, in nsIRDFResource aPredicate,
michael@0:                in nsIRDFNode aObject, in boolean aTruthValue);
michael@0: };