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nsRDFPropertyTestNode.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Chris Waterson <waterson@netscape.com>
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00028  * in which case the provisions of the GPL or the LGPL are applicable instead
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsRDFPropertyTestNode_h__
00040 #define nsRDFPropertyTestNode_h__
00041 
00042 #include "nscore.h"
00043 #include "nsFixedSizeAllocator.h"
00044 #include "nsRDFTestNode.h"
00045 #include "nsIRDFDataSource.h"
00046 #include "nsIRDFResource.h"
00047 class nsConflictSet;
00048 
00049 class nsRDFPropertyTestNode : public nsRDFTestNode
00050 {
00051 public:
00055     nsRDFPropertyTestNode(InnerNode* aParent,
00056                           nsConflictSet& aConflictSet,
00057                           nsIRDFDataSource* aDataSource,
00058                           PRInt32 aSourceVariable,
00059                           nsIRDFResource* aProperty,
00060                           PRInt32 aTargetVariable);
00061 
00065     nsRDFPropertyTestNode(InnerNode* aParent,
00066                           nsConflictSet& aConflictSet,
00067                           nsIRDFDataSource* aDataSource,
00068                           nsIRDFResource* aSource,
00069                           nsIRDFResource* aProperty,
00070                           PRInt32 aTargetVariable);
00071 
00075     nsRDFPropertyTestNode(InnerNode* aParent,
00076                           nsConflictSet& aConflictSet,
00077                           nsIRDFDataSource* aDataSource,
00078                           PRInt32 aSourceVariable,
00079                           nsIRDFResource* aProperty,
00080                           nsIRDFNode* aTarget);
00081 
00082     virtual nsresult FilterInstantiations(InstantiationSet& aInstantiations, void* aClosure) const;
00083 
00084     virtual nsresult GetAncestorVariables(VariableSet& aVariables) const;
00085 
00086     virtual PRBool
00087     CanPropagate(nsIRDFResource* aSource,
00088                  nsIRDFResource* aProperty,
00089                  nsIRDFNode* aTarget,
00090                  Instantiation& aInitialBindings) const;
00091 
00092     virtual void
00093     Retract(nsIRDFResource* aSource,
00094             nsIRDFResource* aProperty,
00095             nsIRDFNode* aTarget,
00096             nsTemplateMatchSet& aFirings,
00097             nsTemplateMatchSet& aRetractions) const;
00098 
00099 
00100     class Element : public MemoryElement {
00101     protected:
00102         // Hide so that only Create() and Destroy() can be used to
00103         // allocate and deallocate from the heap
00104         static void* operator new(size_t) CPP_THROW_NEW { return 0; }
00105         static void operator delete(void*, size_t) {}
00106 
00107     public:
00108         Element(nsIRDFResource* aSource,
00109                 nsIRDFResource* aProperty,
00110                 nsIRDFNode* aTarget)
00111             : mSource(aSource),
00112               mProperty(aProperty),
00113               mTarget(aTarget) {
00114             MOZ_COUNT_CTOR(nsRDFPropertyTestNode::Element); }
00115 
00116         virtual ~Element() { MOZ_COUNT_DTOR(nsRDFPropertyTestNode::Element); }
00117 
00118         static Element*
00119         Create(nsFixedSizeAllocator& aPool,
00120                nsIRDFResource* aSource,
00121                nsIRDFResource* aProperty,
00122                nsIRDFNode* aTarget) {
00123             void* place = aPool.Alloc(sizeof(Element));
00124             return place ? ::new (place) Element(aSource, aProperty, aTarget) : nsnull; }
00125 
00126         static void
00127         Destroy(nsFixedSizeAllocator& aPool, Element* aElement) {
00128             aElement->~Element();
00129             aPool.Free(aElement, sizeof(*aElement)); }
00130 
00131         virtual const char* Type() const {
00132             return "nsRDFPropertyTestNode::Element"; }
00133 
00134         virtual PLHashNumber Hash() const {
00135             return PLHashNumber(NS_PTR_TO_INT32(mSource.get())) ^
00136                 (PLHashNumber(NS_PTR_TO_INT32(mProperty.get())) >> 4) ^
00137                 (PLHashNumber(NS_PTR_TO_INT32(mTarget.get())) >> 12); }
00138 
00139         virtual PRBool Equals(const MemoryElement& aElement) const {
00140             if (aElement.Type() == Type()) {
00141                 const Element& element = NS_STATIC_CAST(const Element&, aElement);
00142                 return mSource == element.mSource
00143                     && mProperty == element.mProperty
00144                     && mTarget == element.mTarget;
00145             }
00146             return PR_FALSE; }
00147 
00148         virtual MemoryElement* Clone(void* aPool) const {
00149             return Create(*NS_STATIC_CAST(nsFixedSizeAllocator*, aPool),
00150                           mSource, mProperty, mTarget); }
00151 
00152     protected:
00153         nsCOMPtr<nsIRDFResource> mSource;
00154         nsCOMPtr<nsIRDFResource> mProperty;
00155         nsCOMPtr<nsIRDFNode> mTarget;
00156     };
00157 
00158 protected:
00159     nsConflictSet&             mConflictSet;
00160     nsCOMPtr<nsIRDFDataSource> mDataSource;
00161     PRInt32                  mSourceVariable;
00162     nsCOMPtr<nsIRDFResource> mSource;
00163     nsCOMPtr<nsIRDFResource> mProperty;
00164     PRInt32                  mTargetVariable;
00165     nsCOMPtr<nsIRDFNode>     mTarget;
00166 };
00167 
00168 #endif // nsRDFPropertyTestNode_h__