зеркало из https://github.com/mozilla/gecko-dev.git
149 строки
4.2 KiB
C++
149 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsSupportsArrayEnumerator.h"
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#include "nsISupportsArray.h"
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nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array)
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: mArray(array), mCursor(0)
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{
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NS_ASSERTION(array, "null array");
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NS_ADDREF(mArray);
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}
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nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator()
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{
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NS_RELEASE(mArray);
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}
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NS_IMPL_ISUPPORTS2(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator, nsIEnumerator)
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::First()
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{
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mCursor = 0;
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PRUint32 cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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PRInt32 end = (PRInt32)cnt;
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if (mCursor < end)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Next()
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{
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PRUint32 cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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PRInt32 end = (PRInt32)cnt;
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if (mCursor < end) // don't count upward forever
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mCursor++;
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if (mCursor < end)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::CurrentItem(nsISupports **aItem)
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{
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NS_ASSERTION(aItem, "null out parameter");
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PRUint32 cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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if (mCursor >= 0 && mCursor < (PRInt32)cnt) {
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*aItem = mArray->ElementAt(mCursor);
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::IsDone()
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{
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PRUint32 cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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return (mCursor >= 0 && mCursor < (PRInt32)cnt)
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? NS_ENUMERATOR_FALSE : NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Last()
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{
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PRUint32 cnt;
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nsresult rv = mArray->Count(&cnt);
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if (NS_FAILED(rv)) return rv;
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mCursor = cnt - 1;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::Prev()
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{
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if (mCursor >= 0)
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--mCursor;
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if (mCursor >= 0)
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return NS_OK;
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else
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return NS_ERROR_FAILURE;
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}
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////////////////////////////////////////////////////////////////////////////////
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NS_COM nsresult
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NS_NewISupportsArrayEnumerator(nsISupportsArray* array,
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nsIBidirectionalEnumerator* *aInstancePtrResult)
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{
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if (aInstancePtrResult == 0)
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return NS_ERROR_NULL_POINTER;
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nsSupportsArrayEnumerator* e = new nsSupportsArrayEnumerator(array);
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if (e == 0)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(e);
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*aInstancePtrResult = e;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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