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lightning-sunbird  0.9+nobinonly
nsContentSupportMap.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 nsContentSupportMap_h__
00040 #define nsContentSupportMap_h__
00041 
00042 #include "pldhash.h"
00043 #include "nsFixedSizeAllocator.h"
00044 #include "nsTemplateMatch.h"
00045 
00056 class nsContentSupportMap {
00057 public:
00058     nsContentSupportMap() { Init(); }
00059     ~nsContentSupportMap() { Finish(); }
00060 
00061     nsresult Put(nsIContent* aElement, nsTemplateMatch* aMatch) {
00062         if (!mMap.ops)
00063             return NS_ERROR_NOT_INITIALIZED;
00064 
00065         PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_ADD);
00066         if (!hdr)
00067             return NS_ERROR_OUT_OF_MEMORY;
00068 
00069         Entry* entry = NS_REINTERPRET_CAST(Entry*, hdr);
00070         NS_ASSERTION(entry->mMatch == nsnull, "over-writing entry");
00071         entry->mContent = aElement;
00072         entry->mMatch   = aMatch;
00073         return NS_OK; }
00074 
00075     PRBool Get(nsIContent* aElement, nsTemplateMatch** aMatch) {
00076         if (!mMap.ops)
00077             return PR_FALSE;
00078 
00079         PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_LOOKUP);
00080         if (PL_DHASH_ENTRY_IS_FREE(hdr))
00081             return PR_FALSE;
00082 
00083         Entry* entry = NS_REINTERPRET_CAST(Entry*, hdr);
00084         *aMatch = entry->mMatch;
00085         return PR_TRUE; }
00086 
00087     nsresult Remove(nsIContent* aElement);
00088 
00089     void Clear() { Finish(); Init(); }
00090 
00091 protected:
00092     PLDHashTable mMap;
00093 
00094     void Init();
00095     void Finish();
00096 
00097     struct Entry {
00098         PLDHashEntryHdr  mHdr;
00099         nsIContent*      mContent;
00100         nsTemplateMatch* mMatch;
00101     };
00102 
00103     static PLDHashTableOps gOps;
00104 
00105     static void PR_CALLBACK
00106     ClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aHdr);
00107 };
00108 
00109 #endif