Back to index

lightning-sunbird  0.9+nobinonly
nsContentSupportMap.cpp
Go to the documentation of this file.
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
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
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 "nsContentSupportMap.h"
00040 #include "nsXULElement.h"
00041 
00042 PLDHashTableOps nsContentSupportMap::gOps = {
00043     PL_DHashAllocTable,
00044     PL_DHashFreeTable,
00045     PL_DHashGetKeyStub,
00046     PL_DHashVoidPtrKeyStub,
00047     PL_DHashMatchEntryStub,
00048     PL_DHashMoveEntryStub,
00049     ClearEntry,
00050     PL_DHashFinalizeStub
00051 };
00052 
00053 void PR_CALLBACK
00054 nsContentSupportMap::ClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aHdr)
00055 {
00056     PL_DHashClearEntryStub(aTable, aHdr);
00057 }
00058 
00059 void
00060 nsContentSupportMap::Init()
00061 {
00062     if (!PL_DHashTableInit(&mMap, &gOps, nsnull, sizeof(Entry), PL_DHASH_MIN_SIZE))
00063         mMap.ops = nsnull;
00064 }
00065 
00066 void
00067 nsContentSupportMap::Finish()
00068 {
00069     if (mMap.ops)
00070         PL_DHashTableFinish(&mMap);
00071 }
00072 
00073 nsresult
00074 nsContentSupportMap::Remove(nsIContent* aElement)
00075 {
00076     if (!mMap.ops)
00077         return NS_ERROR_NOT_INITIALIZED;
00078 
00079     PL_DHashTableOperate(&mMap, aElement, PL_DHASH_REMOVE);
00080 
00081     PRUint32 count;
00082 
00083     // If possible, use the special nsXULElement interface to "peek"
00084     // at the child count without accidentally creating children as a
00085     // side effect, since we're about to rip 'em outta the map anyway.
00086     nsXULElement *xulcontent = nsXULElement::FromContent(aElement);
00087     if (xulcontent) {
00088         count = xulcontent->PeekChildCount();
00089     }
00090     else {
00091         count = aElement->GetChildCount();
00092     }
00093 
00094     for (PRUint32 i = 0; i < count; ++i) {
00095         Remove(aElement->GetChildAt(i));
00096     }
00097 
00098     return NS_OK;
00099 }
00100 
00101