gecko-dev/content/xul/templates/src/nsContentSupportMap.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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
 * http://www.mozilla.org/NPL/
 *
 * 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 <waterson@netscape.com>
 *
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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 NPL, 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 NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsContentSupportMap.h"
#include "nsIXULContent.h"

PLDHashTableOps nsContentSupportMap::gOps = {
    PL_DHashAllocTable,
    PL_DHashFreeTable,
    PL_DHashGetKeyStub,
    PL_DHashVoidPtrKeyStub,
    PL_DHashMatchEntryStub,
    PL_DHashMoveEntryStub,
    ClearEntry,
    PL_DHashFinalizeStub
};

void PR_CALLBACK
nsContentSupportMap::ClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aHdr)
{
    PL_DHashClearEntryStub(aTable, aHdr);
}

void
nsContentSupportMap::Init()
{
    PL_DHashTableInit(&mMap, &gOps, nsnull, sizeof(Entry), PL_DHASH_MIN_SIZE);
}

void
nsContentSupportMap::Finish()
{
    PL_DHashTableFinish(&mMap);
}

nsresult
nsContentSupportMap::Remove(nsIContent* aElement)
{
    PL_DHashTableOperate(&mMap, aElement, PL_DHASH_REMOVE);

    PRInt32 count;

    // If possible, use the special nsIXULContent interface to "peek"
    // at the child count without accidentally creating children as a
    // side effect, since we're about to rip 'em outta the map anyway.
    nsCOMPtr<nsIXULContent> xulcontent = do_QueryInterface(aElement);
    if (xulcontent) {
        xulcontent->PeekChildCount(count);
    }
    else {
        aElement->ChildCount(count);
    }

    for (PRInt32 i = 0; i < count; ++i) {
        nsCOMPtr<nsIContent> child;
        aElement->ChildAt(i, getter_AddRefs(child));

        Remove(child);
    }

    return NS_OK;
}