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22 : * Contributor(s):
23 : * Chris Waterson <waterson@netscape.com>
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38 :
39 : #ifndef nsRDFTestNode_h__
40 : #define nsRDFTestNode_h__
41 :
42 : #include "nsRuleNetwork.h"
43 :
44 : class nsIRDFResource;
45 : class nsIRDFNode;
46 :
47 : /**
48 : * An abstract base class for all of the RDF-related tests. This interface
49 : * allows us to iterate over all of the RDF tests to find the one in the
50 : * network that is apropos for a newly-added assertion.
51 : */
52 : class nsRDFTestNode : public TestNode
53 0 : {
54 : public:
55 0 : nsRDFTestNode(TestNode* aParent)
56 0 : : TestNode(aParent) {}
57 :
58 : /**
59 : * Determine whether the node can propagate an assertion
60 : * with the specified source, property, and target. If the
61 : * assertion can be propagated, aInitialBindings will be
62 : * initialized with appropriate variable-to-value assignments
63 : * to allow the rule network to start a constrain and propagate
64 : * search from this node in the network.
65 : *
66 : * @return true if the node can propagate the specified
67 : * assertion.
68 : */
69 : virtual bool CanPropagate(nsIRDFResource* aSource,
70 : nsIRDFResource* aProperty,
71 : nsIRDFNode* aTarget,
72 : Instantiation& aInitialBindings) const = 0;
73 :
74 : /**
75 : *
76 : */
77 : virtual void Retract(nsIRDFResource* aSource,
78 : nsIRDFResource* aProperty,
79 : nsIRDFNode* aTarget) const = 0;
80 : };
81 :
82 : #endif // nsRDFTestNode_h__
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