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78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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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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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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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(nsISimpleEnumerator::GetIID()) ||
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iid.Equals(kISupportsIID)) {
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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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