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lightning-sunbird  0.9+nobinonly
nsInstantiationNode.cpp
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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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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 #include "nsInstantiationNode.h"
00040 #include "nsTemplateRule.h"
00041 #include "nsClusterKeySet.h"
00042 #include "nsConflictSet.h"
00043 
00044 #include "prlog.h"
00045 #ifdef PR_LOGGING
00046 extern PRLogModuleInfo* gXULTemplateLog;
00047 #endif
00048 
00049 nsInstantiationNode::nsInstantiationNode(nsConflictSet& aConflictSet,
00050                                          nsTemplateRule* aRule,
00051                                          nsIRDFDataSource* aDataSource)
00052         : mConflictSet(aConflictSet),
00053           mRule(aRule)
00054 {
00055 #ifdef PR_LOGGING
00056     PR_LOG(gXULTemplateLog, PR_LOG_DEBUG,
00057            ("nsInstantiationNode[%p] rule=%p", this, aRule));
00058 #endif
00059 }
00060 
00061 
00062 nsInstantiationNode::~nsInstantiationNode()
00063 {
00064     delete mRule;
00065 }
00066 
00067 nsresult
00068 nsInstantiationNode::Propagate(const InstantiationSet& aInstantiations, void* aClosure)
00069 {
00070     // If we get here, we've matched the rule associated with this
00071     // node. Extend it with any <bindings> that we might have, add it
00072     // to the conflict set, and the set of new <content, member>
00073     // pairs.
00074     nsClusterKeySet* newkeys = NS_STATIC_CAST(nsClusterKeySet*, aClosure);
00075 
00076     InstantiationSet::ConstIterator last = aInstantiations.Last();
00077     for (InstantiationSet::ConstIterator inst = aInstantiations.First(); inst != last; ++inst) {
00078         nsAssignmentSet assignments = inst->mAssignments;
00079 
00080         nsTemplateMatch* match =
00081             nsTemplateMatch::Create(mConflictSet.GetPool(), mRule, *inst, assignments);
00082 
00083         if (! match)
00084             return NS_ERROR_OUT_OF_MEMORY;
00085 
00086         // Temporarily AddRef() to keep the match alive.
00087         match->AddRef();
00088 
00089         mRule->InitBindings(mConflictSet, match);
00090 
00091         mConflictSet.Add(match);
00092 
00093         // Give back our "local" reference. The conflict set will have
00094         // taken what it needs.
00095         match->Release(mConflictSet.GetPool());
00096 
00097         newkeys->Add(nsClusterKey(*inst, mRule));
00098     }
00099     
00100     return NS_OK;
00101 }