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85 lines
3.3 KiB
C++
85 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Waterson <waterson@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsRDFTestNode_h__
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#define nsRDFTestNode_h__
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#include "nsRuleNetwork.h"
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class nsIRDFResource;
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class nsIRDFNode;
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class nsTemplateMatchSet;
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/**
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* An abstract base class for all of the RDF-related tests. This interface
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* allows us to iterate over all of the RDF tests to find the one in the
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* network that is apropos for a newly-added assertion.
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*/
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class nsRDFTestNode : public TestNode
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{
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public:
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nsRDFTestNode(InnerNode* aParent)
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: TestNode(aParent) {}
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/**
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* Determine wether the node can propagate an assertion
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* with the specified source, property, and target. If the
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* assertion can be propagated, aInitialBindings will be
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* initialized with appropriate variable-to-value assignments
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* to allow the rule network to start a constrain and propagate
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* search from this node in the network.
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*
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* @return PR_TRUE if the node can propagate the specified
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* assertion.
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*/
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virtual PRBool CanPropagate(nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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Instantiation& aInitialBindings) const = 0;
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/**
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*
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*/
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virtual void Retract(nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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nsTemplateMatchSet& aFirings,
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nsTemplateMatchSet& aRetractions) const = 0;
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};
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#endif // nsRDFTestNode_h__
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