зеркало из https://github.com/mozilla/gecko-dev.git
148 строки
3.6 KiB
C++
148 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#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_INIT_REFCNT();
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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_ADDREF(nsSupportsArrayEnumerator);
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NS_IMPL_RELEASE(nsSupportsArrayEnumerator);
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NS_IMETHODIMP
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nsSupportsArrayEnumerator::QueryInterface(REFNSIID aIID, void** aInstancePtr)
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{
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if (NULL == aInstancePtr)
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return NS_ERROR_NULL_POINTER;
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if (aIID.Equals(nsIBidirectionalEnumerator::GetIID()) ||
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aIID.Equals(nsIEnumerator::GetIID()) ||
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aIID.Equals(nsISupports::GetIID())) {
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*aInstancePtr = (void*) 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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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)[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_COMFALSE : 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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