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nsRDFConInstanceTestNode.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 nsRDFConInstanceTestNode_h__
00040 #define nsRDFConInstanceTestNode_h__
00041 
00042 #include "nscore.h"
00043 #include "nsRDFTestNode.h"
00044 #include "nsFixedSizeAllocator.h"
00045 #include "nsIRDFResource.h"
00046 #include "nsIRDFDataSource.h"
00047 class nsConflictSet;
00048 class nsResourceSet;
00049 
00054 class nsRDFConInstanceTestNode : public nsRDFTestNode
00055 {
00056 public:
00057     enum Test { eFalse, eTrue, eDontCare };
00058 
00059     nsRDFConInstanceTestNode(InnerNode* aParent,
00060                              nsConflictSet& aConflictSet,
00061                              nsIRDFDataSource* aDataSource,
00062                              const nsResourceSet& aMembershipProperties,
00063                              PRInt32 aContainerVariable,
00064                              Test aContainer,
00065                              Test aEmpty);
00066 
00067     virtual nsresult FilterInstantiations(InstantiationSet& aInstantiations, void* aClosure) const;
00068 
00069     virtual nsresult GetAncestorVariables(VariableSet& aVariables) const;
00070 
00071     virtual PRBool
00072     CanPropagate(nsIRDFResource* aSource,
00073                  nsIRDFResource* aProperty,
00074                  nsIRDFNode* aTarget,
00075                  Instantiation& aInitialBindings) const;
00076 
00077     virtual void
00078     Retract(nsIRDFResource* aSource,
00079             nsIRDFResource* aProperty,
00080             nsIRDFNode* aTarget,
00081             nsTemplateMatchSet& aFirings,
00082             nsTemplateMatchSet& aRetractions) const;
00083 
00084 
00085     class Element : public MemoryElement {
00086     protected:
00087         // Hide so that only Create() and Destroy() can be used to
00088         // allocate and deallocate from the heap
00089         static void* operator new(size_t) CPP_THROW_NEW { return 0; }
00090         static void operator delete(void*, size_t) {}
00091 
00092     public:
00093         Element(nsIRDFResource* aContainer,
00094                 Test aContainerTest,
00095                 Test aEmptyTest)
00096             : mContainer(aContainer),
00097               mContainerTest(aContainerTest),
00098               mEmptyTest(aEmptyTest) {
00099             MOZ_COUNT_CTOR(nsRDFConInstanceTestNode::Element); }
00100 
00101         virtual ~Element() { MOZ_COUNT_DTOR(nsRDFConInstanceTestNode::Element); }
00102 
00103         static Element*
00104         Create(nsFixedSizeAllocator& aPool, nsIRDFResource* aContainer,
00105                Test aContainerTest, Test aEmptyTest) {
00106             void* place = aPool.Alloc(sizeof(Element));
00107             return place ? ::new (place) Element(aContainer, aContainerTest, aEmptyTest) : nsnull; }
00108 
00109         static void
00110         Destroy(nsFixedSizeAllocator& aPool, Element* aElement) {
00111             aElement->~Element();
00112             aPool.Free(aElement, sizeof(*aElement)); }
00113 
00114         virtual const char* Type() const {
00115             return "nsRDFConInstanceTestNode::Element"; }
00116 
00117         virtual PLHashNumber Hash() const {
00118             return (PLHashNumber(NS_PTR_TO_INT32(mContainer.get())) >> 4) ^
00119                 PLHashNumber(mContainerTest) ^
00120                 (PLHashNumber(mEmptyTest) << 4); }
00121 
00122         virtual PRBool Equals(const MemoryElement& aElement) const {
00123             if (aElement.Type() == Type()) {
00124                 const Element& element = NS_STATIC_CAST(const Element&, aElement);
00125                 return mContainer == element.mContainer
00126                     && mContainerTest == element.mContainerTest
00127                     && mEmptyTest == element.mEmptyTest;
00128             }
00129             return PR_FALSE; }
00130 
00131         virtual MemoryElement* Clone(void* aPool) const {
00132             return Create(*NS_STATIC_CAST(nsFixedSizeAllocator*, aPool),
00133                           mContainer, mContainerTest, mEmptyTest); }
00134 
00135     protected:
00136         nsCOMPtr<nsIRDFResource> mContainer;
00137         Test mContainerTest;
00138         Test mEmptyTest;
00139     };
00140 
00141 protected:
00142     nsConflictSet& mConflictSet;
00143     nsCOMPtr<nsIRDFDataSource> mDataSource;
00144     const nsResourceSet& mMembershipProperties;
00145     PRInt32 mContainerVariable;
00146     Test mContainer;
00147     Test mEmpty;
00148 };
00149 
00150 #endif // nsRDFConInstanceTestNode_h__
00151