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nsRDFConMemberTestNode.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"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsRDFConMemberTestNode_h__
00040 #define nsRDFConMemberTestNode_h__
00041 
00042 #include "nscore.h"
00043 #include "nsRDFTestNode.h"
00044 #include "nsIRDFDataSource.h"
00045 #include "nsFixedSizeAllocator.h"
00046 class nsConflictSet;
00047 class nsResourceSet;
00048 
00054 class nsRDFConMemberTestNode : public nsRDFTestNode
00055 {
00056 public:
00057     nsRDFConMemberTestNode(InnerNode* aParent,
00058                            nsConflictSet& aConflictSet,
00059                            nsIRDFDataSource* aDataSource,
00060                            const nsResourceSet& aMembershipProperties,
00061                            PRInt32 aContainerVariable,
00062                            PRInt32 aMemberVariable);
00063 
00064     virtual nsresult FilterInstantiations(InstantiationSet& aInstantiations, void* aClosure) const;
00065 
00066     virtual nsresult GetAncestorVariables(VariableSet& aVariables) const;
00067 
00068     virtual PRBool
00069     CanPropagate(nsIRDFResource* aSource,
00070                  nsIRDFResource* aProperty,
00071                  nsIRDFNode* aTarget,
00072                  Instantiation& aInitialBindings) const;
00073 
00074     virtual void
00075     Retract(nsIRDFResource* aSource,
00076             nsIRDFResource* aProperty,
00077             nsIRDFNode* aTarget,
00078             nsTemplateMatchSet& aFirings,
00079             nsTemplateMatchSet& aRetractions) const;
00080 
00081     class Element : public MemoryElement {
00082     protected:
00083         // Hide so that only Create() and Destroy() can be used to
00084         // allocate and deallocate from the heap
00085         static void* operator new(size_t) CPP_THROW_NEW { return 0; }
00086         static void operator delete(void*, size_t) {}
00087 
00088     public:
00089         Element(nsIRDFResource* aContainer,
00090                 nsIRDFNode* aMember)
00091             : mContainer(aContainer),
00092               mMember(aMember) {
00093             MOZ_COUNT_CTOR(nsRDFConMemberTestNode::Element); }
00094 
00095         virtual ~Element() { MOZ_COUNT_DTOR(nsRDFConMemberTestNode::Element); }
00096 
00097         static Element*
00098         Create(nsFixedSizeAllocator& aPool,
00099                nsIRDFResource* aContainer,
00100                nsIRDFNode* aMember) {
00101             void* place = aPool.Alloc(sizeof(Element));
00102             return place ? ::new (place) Element(aContainer, aMember) : nsnull; }
00103 
00104         static void
00105         Destroy(nsFixedSizeAllocator& aPool, Element* aElement) {
00106             aElement->~Element();
00107             aPool.Free(aElement, sizeof(*aElement)); }
00108 
00109         virtual const char* Type() const {
00110             return "nsRDFConMemberTestNode::Element"; }
00111 
00112         virtual PLHashNumber Hash() const {
00113             return PLHashNumber(NS_PTR_TO_INT32(mContainer.get())) ^
00114                 (PLHashNumber(NS_PTR_TO_INT32(mMember.get())) >> 12); }
00115 
00116         virtual PRBool Equals(const MemoryElement& aElement) const {
00117             if (aElement.Type() == Type()) {
00118                 const Element& element = NS_STATIC_CAST(const Element&, aElement);
00119                 return mContainer == element.mContainer && mMember == element.mMember;
00120             }
00121             return PR_FALSE; }
00122 
00123         virtual MemoryElement* Clone(void* aPool) const {
00124             return Create(*NS_STATIC_CAST(nsFixedSizeAllocator*, aPool),
00125                           mContainer, mMember); }
00126 
00127     protected:
00128         nsCOMPtr<nsIRDFResource> mContainer;
00129         nsCOMPtr<nsIRDFNode> mMember;
00130     };
00131 
00132 protected:
00133     nsConflictSet& mConflictSet;
00134     nsCOMPtr<nsIRDFDataSource> mDataSource;
00135     const nsResourceSet& mMembershipProperties;
00136     PRInt32 mContainerVariable;
00137     PRInt32 mMemberVariable;
00138 };
00139 
00140 #endif // nsRDFConMemberTestNode_h__