mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-02 15:15:23 +00:00
171 lines
10 KiB
C++
171 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef nsAgg_h___
|
|
#define nsAgg_h___
|
|
|
|
#include "nsISupports.h"
|
|
|
|
/**
|
|
* Outer objects can implement nsIOuter if they choose, allowing them to
|
|
* get notification if their inner objects (children) are effectively freed.
|
|
* This allows them to reset any state associated with the inner object and
|
|
* potentially unload it.
|
|
*/
|
|
class nsIOuter : public nsISupports {
|
|
public:
|
|
|
|
/**
|
|
* This method is called whenever an inner object's refcount is about to
|
|
* become zero and the inner object should be released by the outer. This
|
|
* allows the outer to clean up any state associated with the inner and
|
|
* potentially unload the inner object. This method should call
|
|
* inner->Release().
|
|
*/
|
|
NS_IMETHOD
|
|
ReleaseInner(nsISupports* inner) = 0;
|
|
|
|
};
|
|
|
|
#define NS_IOUTER_IID \
|
|
{ /* ea0bf9f0-3d67-11d2-8163-006008119d7a */ \
|
|
0xea0bf9f0, \
|
|
0x3d67, \
|
|
0x11d2, \
|
|
{0x81, 0x63, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// Put this in your class's declaration:
|
|
#define NS_DECL_AGGREGATED \
|
|
NS_DECL_ISUPPORTS \
|
|
\
|
|
protected: \
|
|
\
|
|
/* You must implement this operation instead of the nsISupports */ \
|
|
/* methods if you inherit from nsAggregated. */ \
|
|
NS_IMETHOD \
|
|
AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr); \
|
|
\
|
|
class Internal : public nsISupports { \
|
|
public: \
|
|
\
|
|
Internal() {} \
|
|
\
|
|
NS_IMETHOD QueryInterface(const nsIID& aIID, \
|
|
void** aInstancePtr); \
|
|
NS_IMETHOD_(nsrefcnt) AddRef(void); \
|
|
NS_IMETHOD_(nsrefcnt) Release(void); \
|
|
\
|
|
}; \
|
|
\
|
|
friend class Internal; \
|
|
\
|
|
nsISupports* fOuter; \
|
|
Internal fAggregated; \
|
|
\
|
|
nsISupports* GetInner(void) { return &fAggregated; } \
|
|
\
|
|
public: \
|
|
|
|
|
|
// Put this in your class's constructor:
|
|
#define NS_INIT_AGGREGATED(outer) \
|
|
PR_BEGIN_MACRO \
|
|
NS_INIT_REFCNT(); \
|
|
fOuter = outer; \
|
|
PR_END_MACRO
|
|
|
|
|
|
// Put this in your class's implementation file:
|
|
#define NS_IMPL_AGGREGATED(_class) \
|
|
NS_IMETHODIMP \
|
|
_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
|
|
{ \
|
|
/* try our own interfaces first before delegating to outer */ \
|
|
nsresult rslt = AggregatedQueryInterface(aIID, aInstancePtr); \
|
|
if (rslt != NS_OK && fOuter) \
|
|
return fOuter->QueryInterface(aIID, aInstancePtr); \
|
|
else \
|
|
return rslt; \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::AddRef(void) \
|
|
{ \
|
|
++mRefCnt; /* keep track of our refcount as well as outer's */ \
|
|
if (fOuter) \
|
|
return NS_ADDREF(fOuter); \
|
|
else \
|
|
return mRefCnt; \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Release(void) \
|
|
{ \
|
|
if (fOuter) { \
|
|
nsISupports* outer = fOuter; /* in case we release ourself */ \
|
|
nsIOuter* outerIntf; \
|
|
static NS_DEFINE_IID(kIOuterIID, NS_IOUTER_IID); \
|
|
if (mRefCnt == 1 && \
|
|
outer->QueryInterface(kIOuterIID, \
|
|
(void**)&outerIntf) == NS_OK) { \
|
|
outerIntf->ReleaseInner(GetInner()); \
|
|
outerIntf->Release(); \
|
|
} \
|
|
else \
|
|
--mRefCnt; /* keep track of our refcount as well as outer's */ \
|
|
return outer->Release(); \
|
|
} \
|
|
else { \
|
|
if (--mRefCnt == 0) { \
|
|
delete this; \
|
|
return 0; \
|
|
} \
|
|
return mRefCnt; \
|
|
} \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP \
|
|
_class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
return agg->AggregatedQueryInterface(aIID, aInstancePtr); \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::AddRef(void) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
return ++agg->mRefCnt; \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::Release(void) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
if (--agg->mRefCnt == 0) { \
|
|
delete agg; \
|
|
return 0; \
|
|
} \
|
|
return agg->mRefCnt; \
|
|
} \
|
|
|
|
#endif /* nsAgg_h___ */
|