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105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Waterson <waterson@netscape.com>
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*
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsContentSupportMap_h__
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#define nsContentSupportMap_h__
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#include "pldhash.h"
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#include "nsFixedSizeAllocator.h"
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#include "nsTemplateMatch.h"
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/**
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* The nsContentSupportMap maintains a mapping from a "resource element"
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* in the content tree to the nsTemplateMatch that was used to instantiate it. This
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* is necessary to allow the XUL content to be built lazily. Specifically,
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* when building "resumes" on a partially-built content element, the builder
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* will walk upwards in the content tree to find the first element with an
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* 'id' attribute. This element is assumed to be the "resource element",
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* and allows the content builder to access the nsTemplateMatch (variable assignments
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* and rule information).
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*/
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class nsContentSupportMap {
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public:
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nsContentSupportMap() { Init(); }
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~nsContentSupportMap() { Finish(); }
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nsresult Put(nsIContent* aElement, nsTemplateMatch* aMatch) {
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PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_ADD);
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if (!hdr)
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return NS_ERROR_OUT_OF_MEMORY;
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Entry* entry = NS_REINTERPRET_CAST(Entry*, hdr);
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NS_ASSERTION(entry->mMatch == nsnull, "over-writing entry");
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entry->mContent = aElement;
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entry->mMatch = aMatch;
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return NS_OK; }
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PRBool Get(nsIContent* aElement, nsTemplateMatch** aMatch) {
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PLDHashEntryHdr* hdr = PL_DHashTableOperate(&mMap, aElement, PL_DHASH_LOOKUP);
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if (PL_DHASH_ENTRY_IS_FREE(hdr))
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return PR_FALSE;
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Entry* entry = NS_REINTERPRET_CAST(Entry*, hdr);
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*aMatch = entry->mMatch;
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return PR_TRUE; }
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nsresult Remove(nsIContent* aElement);
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void Clear() { Finish(); Init(); }
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protected:
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PLDHashTable mMap;
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void Init();
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void Finish();
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struct Entry {
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PLDHashEntryHdr mHdr;
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nsIContent* mContent;
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nsTemplateMatch* mMatch;
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};
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static PLDHashTableOps gOps;
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static void PR_CALLBACK
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ClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aHdr);
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};
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#endif
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