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nsTemplateRule.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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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 nsTemplateRule_h__
00040 #define nsTemplateRule_h__
00041 
00042 #include "nsCOMPtr.h"
00043 #include "nsIRDFDataSource.h"
00044 #include "nsIRDFResource.h"
00045 #include "nsIContent.h"
00046 
00047 class nsConflictSet;
00048 class nsTemplateMatch;
00049 class Value;
00050 class VariableSet;
00051 
00071 class nsTemplateRule
00072 {
00073 public:
00074     nsTemplateRule(nsIRDFDataSource* aDataSource,
00075          nsIContent* aContent,
00076          PRInt32 aPriority)
00077         : mDataSource(aDataSource),
00078           mContent(aContent),
00079           mContainerVariable(0),
00080           mMemberVariable(0),
00081           mPriority(aPriority),
00082           mCount(0),
00083           mCapacity(0),
00084           mBindings(nsnull)
00085         { MOZ_COUNT_CTOR(nsTemplateRule); }
00086 
00087     ~nsTemplateRule();
00088 
00095     nsresult GetContent(nsIContent** aResult) const;
00096 
00104     void SetContainerVariable(PRInt32 aContainerVariable) {
00105         mContainerVariable = aContainerVariable; }
00106 
00111     PRInt32 GetContainerVariable() const {
00112         return mContainerVariable; }
00113 
00121     void SetMemberVariable(PRInt32 aMemberVariable) {
00122         mMemberVariable = aMemberVariable; }
00123 
00128     PRInt32 GetMemberVariable() const {
00129         return mMemberVariable; }
00130 
00136     PRInt32 GetPriority() const {
00137         return mPriority; }
00138 
00142     PRBool
00143     HasBinding(PRInt32 aSourceVariable,
00144                nsIRDFResource* aProperty,
00145                PRInt32 aTargetVariable) const;
00146 
00161     nsresult AddBinding(PRInt32 aSourceVariable,
00162                         nsIRDFResource* aProperty,
00163                         PRInt32 aTargetVariable);
00164 
00174     nsresult InitBindings(nsConflictSet& aConflictSet, nsTemplateMatch* aMatch) const;
00175 
00190     nsresult RecomputeBindings(nsConflictSet& aConflictSet,
00191                                nsTemplateMatch* aMatch,
00192                                nsIRDFResource* aSource,
00193                                nsIRDFResource* aProperty,
00194                                nsIRDFNode* aOldTarget,
00195                                nsIRDFNode* aNewTarget,
00196                                VariableSet& aModifiedVars) const;
00197 
00214     PRBool ComputeAssignmentFor(nsConflictSet& aConflictSet,
00215                                 nsTemplateMatch* aMatch,
00216                                 PRInt32 aVariable,
00217                                 Value* aValue) const;
00218 
00228     PRBool DependsOn(PRInt32 aChild, PRInt32 aParent) const;
00229 
00230 protected:
00231     nsCOMPtr<nsIRDFDataSource> mDataSource;
00232     nsCOMPtr<nsIContent> mContent;
00233     PRInt32 mContainerVariable;
00234     PRInt32 mMemberVariable;
00235     PRInt32 mPriority;
00236 
00237     PRInt32 mCount;
00238     PRInt32 mCapacity;
00239 
00240     struct Binding {
00241         PRInt32                  mSourceVariable;
00242         nsCOMPtr<nsIRDFResource> mProperty;
00243         PRInt32                  mTargetVariable;
00244         Binding*                 mNext;
00245         Binding*                 mParent;
00246     };
00247 
00248     Binding* mBindings;
00249 };
00250 
00251 #endif // nsTemplateRule_h__