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169 lines
10 KiB
C++
169 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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#ifndef nsAgg_h___
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#define nsAgg_h___
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#include "nsISupports.h"
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/**
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* Outer objects can implement nsIOuter if they choose, allowing them to
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* get notification if their inner objects (children) are effectively freed.
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* This allows them to reset any state associated with the inner object and
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* potentially unload it.
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*/
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class nsIOuter : public nsISupports {
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public:
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/**
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* This method is called whenever an inner object's refcount is about to
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* become zero and the inner object should be released by the outer. This
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* allows the outer to clean up any state associated with the inner and
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* potentially unload the inner object. This method should call
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* inner->Release().
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*/
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NS_IMETHOD
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ReleaseInner(nsISupports* inner) = 0;
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};
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#define NS_IOUTER_IID \
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{ /* ea0bf9f0-3d67-11d2-8163-006008119d7a */ \
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0xea0bf9f0, \
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0x3d67, \
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0x11d2, \
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{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
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}
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////////////////////////////////////////////////////////////////////////////////
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// Put this in your class's declaration:
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#define NS_DECL_AGGREGATED \
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NS_DECL_ISUPPORTS \
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\
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protected: \
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\
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/* You must implement this operation instead of the nsISupports */ \
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/* methods if you inherit from nsAggregated. */ \
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NS_IMETHOD \
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AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr); \
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\
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class Internal : public nsISupports { \
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public: \
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\
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Internal() {} \
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\
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NS_IMETHOD QueryInterface(const nsIID& aIID, \
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void** aInstancePtr); \
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NS_IMETHOD_(nsrefcnt) AddRef(void); \
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NS_IMETHOD_(nsrefcnt) Release(void); \
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\
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}; \
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\
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friend class Internal; \
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\
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nsISupports* fOuter; \
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Internal fAggregated; \
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\
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nsISupports* GetInner(void) { return &fAggregated; } \
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\
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public: \
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// Put this in your class's constructor:
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#define NS_INIT_AGGREGATED(outer) \
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NS_INIT_REFCNT(); \
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fOuter = outer; \
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// Put this in your class's implementation file:
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#define NS_IMPL_AGGREGATED(_class) \
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NS_IMETHODIMP \
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_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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/* try our own interfaces first before delegating to outer */ \
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nsresult rslt = AggregatedQueryInterface(aIID, aInstancePtr); \
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if (rslt != NS_OK && fOuter) \
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return fOuter->QueryInterface(aIID, aInstancePtr); \
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else \
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return rslt; \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::AddRef(void) \
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{ \
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++mRefCnt; /* keep track of our refcount as well as outer's */ \
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if (fOuter) \
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return NS_ADDREF(fOuter); \
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else \
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return mRefCnt; \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Release(void) \
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{ \
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if (fOuter) { \
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nsISupports* outer = fOuter; /* in case we release ourself */ \
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nsIOuter* outerIntf; \
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static NS_DEFINE_IID(kIOuterIID, NS_IOUTER_IID); \
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if (mRefCnt == 1 && \
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outer->QueryInterface(kIOuterIID, \
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(void**)&outerIntf) == NS_OK) { \
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outerIntf->ReleaseInner(GetInner()); \
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outerIntf->Release(); \
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} \
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else \
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--mRefCnt; /* keep track of our refcount as well as outer's */ \
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return outer->Release(); \
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} \
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else { \
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if (--mRefCnt == 0) { \
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delete this; \
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return 0; \
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} \
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return mRefCnt; \
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} \
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} \
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\
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NS_IMETHODIMP \
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_class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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return agg->AggregatedQueryInterface(aIID, aInstancePtr); \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Internal::AddRef(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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return ++agg->mRefCnt; \
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} \
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\
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NS_IMETHODIMP_(nsrefcnt) \
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_class::Internal::Release(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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if (--agg->mRefCnt == 0) { \
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delete agg; \
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return 0; \
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} \
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return agg->mRefCnt; \
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} \
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#endif /* nsAgg_h___ */
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