79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 "nsStack.h"
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#include "nsxpfcCIID.h"
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#include "nsxpfcutil.h"
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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static NS_DEFINE_IID(kCStackCID, NS_STACK_CID);
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nsStack :: nsStack()
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{
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NS_INIT_REFCNT();
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mVoidArray = nsnull ;
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}
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nsStack :: ~nsStack()
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{
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DeleteIfObject(mVoidArray) ;
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}
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NS_IMPL_QUERY_INTERFACE(nsStack, kCStackCID)
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NS_IMPL_ADDREF(nsStack)
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NS_IMPL_RELEASE(nsStack)
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nsresult nsStack :: Init()
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{
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mVoidArray = NewObject(nsVoidArray) ;
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return NS_OK ;
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}
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PRBool nsStack :: Empty()
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{
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return (mVoidArray->Count() ? PR_TRUE : PR_FALSE) ;
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}
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nsresult nsStack :: Push(nsComponent aComponent)
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{
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nsresult res = NS_OK;
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if (PR_TRUE == mVoidArray->AppendElement(aComponent))
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return NS_OK ;
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return res ;
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}
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nsComponent nsStack :: Pop()
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{
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nsComponent component = mVoidArray->ElementAt(mVoidArray->Count()-1);
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if (PR_TRUE == mVoidArray->RemoveElementAt(mVoidArray->Count()-1))
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return component ;
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return nsnull ;
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}
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nsComponent nsStack :: Top()
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{
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return (mVoidArray->ElementAt(mVoidArray->Count()-1)) ;
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}
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