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lightning-sunbird  0.9+nobinonly
nsDeleteObserver.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00037 #include "nsDeleteObserver.h"
00038 #include "nsVoidArray.h"
00039 
00040 
00041 //-------------------------------------------------------------------------
00042 //
00043 //-------------------------------------------------------------------------
00044 
00045 nsDeleteObserved::nsDeleteObserved(void* aObject)
00046 {
00047        mDeleteObserverArray = nsnull;
00048        mObject = (aObject ? aObject : this);
00049 }
00050 
00051 //-------------------------------------------------------------------------
00052 //
00053 //-------------------------------------------------------------------------
00054 
00055 nsDeleteObserved::~nsDeleteObserved()
00056 {
00057        if (mDeleteObserverArray)
00058        {
00059               // notify observers of the delete
00060               for (PRInt32 i = mDeleteObserverArray->Count() - 1; i >= 0; --i)
00061               {
00062                      nsDeleteObserver* deleteObserver = static_cast<nsDeleteObserver*>(mDeleteObserverArray->ElementAt(i));
00063                      if (deleteObserver)
00064                             deleteObserver->NotifyDelete(mObject);
00065               }
00066 
00067               delete mDeleteObserverArray;
00068               mDeleteObserverArray = nsnull;
00069        }
00070 }
00071 
00072 //-------------------------------------------------------------------------
00073 //
00074 //-------------------------------------------------------------------------
00075 
00076 PRBool nsDeleteObserved::AddDeleteObserver(nsDeleteObserver* aDeleteObserver)
00077 {
00078        if (! mDeleteObserverArray)
00079               mDeleteObserverArray = new nsVoidArray();
00080 
00081        if (mDeleteObserverArray)
00082               return mDeleteObserverArray->AppendElement(aDeleteObserver);
00083        return PR_FALSE;
00084 }
00085 
00086 //-------------------------------------------------------------------------
00087 //
00088 //-------------------------------------------------------------------------
00089 
00090 PRBool nsDeleteObserved::RemoveDeleteObserver(nsDeleteObserver* aDeleteObserver)
00091 {
00092        if (mDeleteObserverArray)
00093               return mDeleteObserverArray->RemoveElement(aDeleteObserver);
00094        return PR_FALSE;
00095 }