author David Zbarsky <>
Tue, 27 Sep 2011 09:54:58 +0200
changeset 77683 80ff402f2f7e9d4c42b4658febf1a252a89b6347
parent 27258 273d8da211110754272ac11ad3c3cdf9e135f7a1
child 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
child 105239 cad26d2fb5af799dfe030fd2a8948d617eac2f52
permissions -rw-r--r--
Bug 682367 - Call nsINode::GetChildAt less. r=smaug

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * The Original Code is Mozilla Communicator client code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 *   Chris Waterson <>
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * ***** END LICENSE BLOCK ***** */

#ifndef nsTemplateMap_h__
#define nsTemplateMap_h__

#include "pldhash.h"
#include "nsXULElement.h"

class nsTemplateMap {
    struct Entry {
        PLDHashEntryHdr mHdr;
        nsIContent*     mContent;
        nsIContent*     mTemplate;

    PLDHashTable mTable;

    Init() { PL_DHashTableInit(&mTable, PL_DHashGetStubOps(), nsnull, sizeof(Entry), PL_DHASH_MIN_SIZE); }

    Finish() { PL_DHashTableFinish(&mTable); }

    nsTemplateMap() { Init(); }

    ~nsTemplateMap() { Finish(); }

    Put(nsIContent* aContent, nsIContent* aTemplate) {
        NS_ASSERTION(PL_DHASH_ENTRY_IS_FREE(PL_DHashTableOperate(&mTable, aContent, PL_DHASH_LOOKUP)),
                     "aContent already in map");

        Entry* entry =
            reinterpret_cast<Entry*>(PL_DHashTableOperate(&mTable, aContent, PL_DHASH_ADD));

        if (entry) {
            entry->mContent = aContent;
            entry->mTemplate = aTemplate;

    Remove(nsIContent* aContent) {
        PL_DHashTableOperate(&mTable, aContent, PL_DHASH_REMOVE);

        for (nsIContent* child = aContent->GetFirstChild();
             child = child->GetNextSibling()) {

    GetTemplateFor(nsIContent* aContent, nsIContent** aResult) {
        Entry* entry =
            reinterpret_cast<Entry*>(PL_DHashTableOperate(&mTable, aContent, PL_DHASH_LOOKUP));

        if (PL_DHASH_ENTRY_IS_BUSY(&entry->mHdr))
            NS_IF_ADDREF(*aResult = entry->mTemplate);
            *aResult = nsnull;

    Clear() { Finish(); Init(); }

#endif // nsTemplateMap_h__