зеркало из https://github.com/mozilla/gecko-dev.git
96 строки
3.0 KiB
C++
96 строки
3.0 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.org 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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* Pierre Phaneuf <pp@ludusdesign.com>
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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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/*
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An empty enumerator.
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*/
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#include "nsIEnumerator.h"
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////////////////////////////////////////////////////////////////////////
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class EmptyEnumeratorImpl : public nsISimpleEnumerator
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{
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public:
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EmptyEnumeratorImpl(void) {};
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virtual ~EmptyEnumeratorImpl(void) {};
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// nsISupports interface
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NS_IMETHOD_(nsrefcnt) AddRef(void) {
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return 2;
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}
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NS_IMETHOD_(nsrefcnt) Release(void) {
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return 1;
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}
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NS_IMETHOD QueryInterface(REFNSIID iid, void** result) {
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if (! result)
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return NS_ERROR_NULL_POINTER;
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if (iid.Equals(NS_GET_IID(nsISimpleEnumerator)) ||
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iid.Equals(NS_GET_IID(nsISupports))) {
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*result = (nsISimpleEnumerator*) this;
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NS_ADDREF(this);
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return NS_OK;
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}
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return NS_NOINTERFACE;
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}
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// nsISimpleEnumerator
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NS_IMETHOD HasMoreElements(PRBool* aResult) {
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*aResult = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHOD GetNext(nsISupports** aResult) {
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return NS_ERROR_UNEXPECTED;
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}
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};
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extern "C" NS_COM nsresult
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NS_NewEmptyEnumerator(nsISimpleEnumerator** aResult)
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{
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static EmptyEnumeratorImpl gEmptyEnumerator;
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*aResult = &gEmptyEnumerator;
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return NS_OK;
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}
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