michael@0: /* -*- Mode: C++; 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: #ifndef nsRDFTestNode_h__
michael@0: #define nsRDFTestNode_h__
michael@0: 
michael@0: #include "nsRuleNetwork.h"
michael@0: 
michael@0: class nsIRDFResource;
michael@0: class nsIRDFNode;
michael@0: 
michael@0: /**
michael@0:  * An abstract base class for all of the RDF-related tests. This interface
michael@0:  * allows us to iterate over all of the RDF tests to find the one in the
michael@0:  * network that is apropos for a newly-added assertion.
michael@0:  */
michael@0: class nsRDFTestNode : public TestNode
michael@0: {
michael@0: public:
michael@0:     nsRDFTestNode(TestNode* aParent)
michael@0:         : TestNode(aParent) {}
michael@0: 
michael@0:     /**
michael@0:      * Determine whether the node can propagate an assertion
michael@0:      * with the specified source, property, and target. If the
michael@0:      * assertion can be propagated, aInitialBindings will be
michael@0:      * initialized with appropriate variable-to-value assignments
michael@0:      * to allow the rule network to start a constrain and propagate
michael@0:      * search from this node in the network.
michael@0:      *
michael@0:      * @return true if the node can propagate the specified
michael@0:      * assertion.
michael@0:      */
michael@0:     virtual bool CanPropagate(nsIRDFResource* aSource,
michael@0:                                 nsIRDFResource* aProperty,
michael@0:                                 nsIRDFNode* aTarget,
michael@0:                                 Instantiation& aInitialBindings) const = 0;
michael@0: 
michael@0:     /**
michael@0:      *
michael@0:      */
michael@0:     virtual void Retract(nsIRDFResource* aSource,
michael@0:                          nsIRDFResource* aProperty,
michael@0:                          nsIRDFNode* aTarget) const = 0;
michael@0: };
michael@0: 
michael@0: #endif // nsRDFTestNode_h__