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115 lines
3.3 KiB
C++
115 lines
3.3 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsAdapterEnumerator.h"
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////////////////////////////////////////////////////////////////////////
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nsAdapterEnumerator::nsAdapterEnumerator(nsIEnumerator* aEnum)
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: mEnum(aEnum), mCurrent(0), mStarted(PR_FALSE)
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{
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NS_ADDREF(mEnum);
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}
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nsAdapterEnumerator::~nsAdapterEnumerator()
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{
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NS_RELEASE(mEnum);
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NS_IF_RELEASE(mCurrent);
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}
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NS_IMPL_ISUPPORTS1(nsAdapterEnumerator, nsISimpleEnumerator)
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NS_IMETHODIMP
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nsAdapterEnumerator::HasMoreElements(PRBool* aResult)
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{
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nsresult rv;
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if (mCurrent) {
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*aResult = PR_TRUE;
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return NS_OK;
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}
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if (! mStarted) {
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mStarted = PR_TRUE;
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rv = mEnum->First();
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if (rv == NS_OK) {
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mEnum->CurrentItem(&mCurrent);
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*aResult = PR_TRUE;
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}
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else {
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*aResult = PR_FALSE;
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}
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}
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else {
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*aResult = PR_FALSE;
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rv = mEnum->IsDone();
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if (rv != NS_OK) {
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// We're not done. Advance to the next one.
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rv = mEnum->Next();
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if (rv == NS_OK) {
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mEnum->CurrentItem(&mCurrent);
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*aResult = PR_TRUE;
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}
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAdapterEnumerator::GetNext(nsISupports** aResult)
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{
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nsresult rv;
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PRBool hasMore;
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rv = HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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if (! hasMore)
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return NS_ERROR_UNEXPECTED;
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// No need to addref, we "transfer" the ownership to the caller.
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*aResult = mCurrent;
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mCurrent = 0;
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return NS_OK;
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}
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