зеркало из https://github.com/mozilla/gecko-dev.git
80 строки
2.0 KiB
C++
80 строки
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
*
|
|
* 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.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
/*
|
|
|
|
An empty enumerator.
|
|
|
|
*/
|
|
|
|
#include "nsIEnumerator.h"
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
class EmptyEnumeratorImpl : public nsISimpleEnumerator
|
|
{
|
|
public:
|
|
EmptyEnumeratorImpl(void) {};
|
|
virtual ~EmptyEnumeratorImpl(void) {};
|
|
|
|
// nsISupports interface
|
|
NS_IMETHOD_(nsrefcnt) AddRef(void) {
|
|
return 2;
|
|
}
|
|
|
|
NS_IMETHOD_(nsrefcnt) Release(void) {
|
|
return 1;
|
|
}
|
|
|
|
NS_IMETHOD QueryInterface(REFNSIID iid, void** result) {
|
|
if (! result)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (iid.Equals(nsISimpleEnumerator::GetIID()) ||
|
|
iid.Equals(NS_GET_IID(nsISupports))) {
|
|
*result = (nsISimpleEnumerator*) this;
|
|
NS_ADDREF(this);
|
|
return NS_OK;
|
|
}
|
|
return NS_NOINTERFACE;
|
|
}
|
|
|
|
// nsISimpleEnumerator
|
|
NS_IMETHOD HasMoreElements(PRBool* aResult) {
|
|
*aResult = PR_FALSE;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHOD GetNext(nsISupports** aResult) {
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
};
|
|
|
|
extern "C" NS_COM nsresult
|
|
NS_NewEmptyEnumerator(nsISimpleEnumerator** aResult)
|
|
{
|
|
static EmptyEnumeratorImpl gEmptyEnumerator;
|
|
*aResult = &gEmptyEnumerator;
|
|
return NS_OK;
|
|
}
|
|
|