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nsContentTestNode.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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00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsContentTestNode_h__
00040 #define nsContentTestNode_h__
00041 
00042 #include "nscore.h"
00043 #include "nsRuleNetwork.h"
00044 #include "nsFixedSizeAllocator.h"
00045 #include "nsIAtom.h"
00046 
00047 class nsIXULTemplateBuilder;
00048 class nsIXULDocument;
00049 class nsConflictSet;
00050 
00051 class nsContentTestNode : public TestNode
00052 {
00053 public:
00054     nsContentTestNode(InnerNode* aParent,
00055                       nsConflictSet& aConflictSet,
00056                       nsIXULDocument* aDocument,
00057                       nsIXULTemplateBuilder* aBuilder,
00058                       PRInt32 aContentVariable,
00059                       PRInt32 aIdVariable,
00060                       nsIAtom* aTag);
00061 
00062     virtual nsresult
00063     FilterInstantiations(InstantiationSet& aInstantiations, void* aClosure) const;
00064 
00065     virtual nsresult
00066     GetAncestorVariables(VariableSet& aVariables) const;
00067 
00068     class Element : public MemoryElement {
00069     private:
00070         // Hide so that only Create() and Destroy() can be used to
00071         // allocate and deallocate from the heap
00072         static void* operator new(size_t) CPP_THROW_NEW { return 0; }
00073         static void operator delete(void*, size_t) {}
00074 
00075     public:
00076         Element(nsIContent* aContent)
00077             : mContent(aContent) {
00078             MOZ_COUNT_CTOR(nsContentTestNode::Element); }
00079 
00080         virtual ~Element() { MOZ_COUNT_DTOR(nsContentTestNode::Element); }
00081 
00082         static Element*
00083         Create(nsFixedSizeAllocator& aPool, nsIContent* aContent) {
00084             void* place = aPool.Alloc(sizeof(Element));
00085             return place ? ::new (place) Element(aContent) : nsnull; }
00086 
00087         static void
00088         Destroy(nsFixedSizeAllocator& aPool, Element* aElement) {
00089             aElement->~Element();
00090             aPool.Free(aElement, sizeof(*aElement)); }
00091 
00092         virtual const char* Type() const {
00093             return "nsContentTestNode::Element"; }
00094 
00095         virtual PLHashNumber Hash() const {
00096             return PLHashNumber(NS_PTR_TO_INT32(mContent.get())) >> 2; }
00097 
00098         virtual PRBool Equals(const MemoryElement& aElement) const {
00099             if (aElement.Type() == Type()) {
00100                 const Element& element = NS_STATIC_CAST(const Element&, aElement);
00101                 return mContent == element.mContent;
00102             }
00103             return PR_FALSE; }
00104 
00105         virtual MemoryElement* Clone(void* aPool) const {
00106             return Create(*NS_STATIC_CAST(nsFixedSizeAllocator*, aPool), mContent); }
00107 
00108     protected:
00109         nsCOMPtr<nsIContent> mContent;
00110     };
00111 
00112 protected:
00113     nsConflictSet& mConflictSet;
00114     nsIXULDocument* mDocument; // [WEAK] because we know the document will outlive us
00115     nsIXULTemplateBuilder *mBuilder;
00116     PRInt32 mContentVariable;
00117     PRInt32 mIdVariable;
00118     nsCOMPtr<nsIAtom> mTag;
00119 };
00120 
00121 #endif // nsContentTestNode_h__
00122