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nsTemplateMatch.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
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #ifndef nsTemplateMatch_h__
00040 #define nsTemplateMatch_h__
00041 
00042 #include "nsFixedSizeAllocator.h"
00043 #include "nsResourceSet.h"
00044 #include "nsRuleNetwork.h"
00045 #include NEW_H
00046 
00057 class nsConflictSet;
00058 class nsTemplateRule;
00059 
00060 class nsTemplateMatch {
00061 private:
00062     // Hide so that only Create() and Destroy() can be used to
00063     // allocate and deallocate from the heap
00064     void* operator new(size_t) CPP_THROW_NEW { return 0; }
00065     void operator delete(void*, size_t) {}
00066 
00067 protected:
00068     PRInt32 mRefCnt;
00069 
00070     nsTemplateMatch(const nsTemplateRule* aRule,
00071                     const Instantiation& aInstantiation,
00072                     const nsAssignmentSet& aAssignments)
00073         : mRefCnt(0),
00074           mRule(aRule),
00075           mInstantiation(aInstantiation),
00076           mAssignments(aAssignments) {}
00077 
00078 public:
00079     static nsTemplateMatch*
00080     Create(nsFixedSizeAllocator& aPool,
00081            const nsTemplateRule* aRule,
00082            const Instantiation& aInstantiation,
00083            const nsAssignmentSet& aAssignments) {
00084         void* place = aPool.Alloc(sizeof(nsTemplateMatch));
00085         return place ? ::new (place) nsTemplateMatch(aRule, aInstantiation, aAssignments) : nsnull; }
00086 
00087     static void
00088     Destroy(nsFixedSizeAllocator& aPool, nsTemplateMatch* aMatch) {
00089         aMatch->~nsTemplateMatch();
00090         aPool.Free(aMatch, sizeof(*aMatch)); }
00091 
00092     PRBool operator==(const nsTemplateMatch& aMatch) const {
00093         return mRule == aMatch.mRule && mInstantiation == aMatch.mInstantiation; }
00094 
00095     PRBool operator!=(const nsTemplateMatch& aMatch) const {
00096         return !(*this == aMatch); }
00097 
00107     PRBool GetAssignmentFor(nsConflictSet& aConflictSet, PRInt32 aVariable, Value* aValue);
00108 
00112     const nsTemplateRule* mRule;
00113 
00118     Instantiation mInstantiation;
00119 
00124     nsAssignmentSet mAssignments;
00125 
00133     nsResourceSet mBindingDependencies;
00134 
00135     PRInt32 AddRef() {
00136         ++mRefCnt;
00137         NS_LOG_ADDREF(this, mRefCnt, "nsTemplateMatch", sizeof(*this));
00138         return mRefCnt; }
00139 
00140     PRInt32 Release(nsFixedSizeAllocator& aPool) {
00141         NS_PRECONDITION(mRefCnt > 0, "bad refcnt");
00142         PRInt32 refcnt = --mRefCnt;
00143         NS_LOG_RELEASE(this, mRefCnt, "nsTemplateMatch");
00144         if (refcnt == 0)
00145             Destroy(aPool, this);
00146         return refcnt; }
00147 
00148 private:
00149     nsTemplateMatch(const nsTemplateMatch& aMatch); // not to be implemented
00150     void operator=(const nsTemplateMatch& aMatch); // not to be implemented
00151 };
00152 
00153 #endif // nsConflictSet_h__
00154