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C/C++ Source or Header  |  2006-05-08  |  9.3 KB  |  156 lines
  1. /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
  2. /* ***** BEGIN LICENSE BLOCK *****
  3.  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  4.  *
  5.  * The contents of this file are subject to the Mozilla Public License Version
  6.  * 1.1 (the "License"); you may not use this file except in compliance with
  7.  * the License. You may obtain a copy of the License at
  8.  * http://www.mozilla.org/MPL/
  9.  *
  10.  * Software distributed under the License is distributed on an "AS IS" basis,
  11.  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12.  * for the specific language governing rights and limitations under the
  13.  * License.
  14.  *
  15.  * The Original Code is mozilla.org code.
  16.  *
  17.  * The Initial Developer of the Original Code is
  18.  * Netscape Communications Corporation.
  19.  * Portions created by the Initial Developer are Copyright (C) 1998
  20.  * the Initial Developer. All Rights Reserved.
  21.  *
  22.  * Contributor(s):
  23.  *
  24.  * Alternatively, the contents of this file may be used under the terms of
  25.  * either of the GNU General Public License Version 2 or later (the "GPL"),
  26.  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27.  * in which case the provisions of the GPL or the LGPL are applicable instead
  28.  * of those above. If you wish to allow use of your version of this file only
  29.  * under the terms of either the GPL or the LGPL, and not to allow others to
  30.  * use your version of this file under the terms of the MPL, indicate your
  31.  * decision by deleting the provisions above and replace them with the notice
  32.  * and other provisions required by the GPL or the LGPL. If you do not delete
  33.  * the provisions above, a recipient may use your version of this file under
  34.  * the terms of any one of the MPL, the GPL or the LGPL.
  35.  *
  36.  * ***** END LICENSE BLOCK ***** */
  37.  
  38. #ifndef nsAgg_h___
  39. #define nsAgg_h___
  40.  
  41. #include "nsISupports.h"
  42.  
  43.  
  44. ////////////////////////////////////////////////////////////////////////////////
  45.  
  46. // Put this in your class's declaration:
  47. #define NS_DECL_AGGREGATED                                                  \
  48.     NS_DECL_ISUPPORTS                                                       \
  49.                                                                             \
  50. public:                                                                     \
  51.                                                                             \
  52.     /* You must implement this operation instead of the nsISupports */      \
  53.     /* methods if you inherit from nsAggregated. */                         \
  54.     NS_IMETHOD                                                              \
  55.     AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr);       \
  56.                                                                             \
  57. protected:                                                                  \
  58.                                                                             \
  59.     class Internal : public nsISupports {                                   \
  60.     public:                                                                 \
  61.                                                                             \
  62.         Internal() {}                                                       \
  63.                                                                             \
  64.         NS_IMETHOD QueryInterface(const nsIID& aIID,                        \
  65.                                         void** aInstancePtr);               \
  66.         NS_IMETHOD_(nsrefcnt) AddRef(void);                                 \
  67.         NS_IMETHOD_(nsrefcnt) Release(void);                                \
  68.                                                                             \
  69.     };                                                                      \
  70.                                                                             \
  71.     friend class Internal;                                                  \
  72.                                                                             \
  73.     nsISupports*        fOuter;                                             \
  74.     Internal            fAggregated;                                        \
  75.                                                                             \
  76.     nsISupports* GetInner(void) { return &fAggregated; }                    \
  77.                                                                             \
  78. public:                                                                     \
  79.  
  80.  
  81. // Put this in your class's constructor:
  82. #define NS_INIT_AGGREGATED(outer)                                           \
  83.   PR_BEGIN_MACRO                                                            \
  84.     fOuter = outer ? outer : &fAggregated;                                  \
  85.   PR_END_MACRO
  86.  
  87.  
  88. // Put this in your class's implementation file:
  89. #define NS_IMPL_AGGREGATED(_class)                                          \
  90. NS_IMETHODIMP                                                               \
  91. _class::QueryInterface(const nsIID& aIID, void** aInstancePtr)              \
  92. {                                                                           \
  93.     return fOuter->QueryInterface(aIID, aInstancePtr);                      \
  94. }                                                                           \
  95.                                                                             \
  96. NS_IMETHODIMP_(nsrefcnt)                                                    \
  97. _class::AddRef(void)                                                        \
  98. {                                                                           \
  99.     return fOuter->AddRef();                                                \
  100. }                                                                           \
  101.                                                                             \
  102. NS_IMETHODIMP_(nsrefcnt)                                                    \
  103. _class::Release(void)                                                       \
  104. {                                                                           \
  105.     return fOuter->Release();                                               \
  106. }                                                                           \
  107.                                                                             \
  108. NS_IMETHODIMP                                                               \
  109. _class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr)    \
  110. {                                                                           \
  111.     _class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
  112.     return agg->AggregatedQueryInterface(aIID, aInstancePtr);               \
  113. }                                                                           \
  114.                                                                             \
  115. NS_IMETHODIMP_(nsrefcnt)                                                    \
  116. _class::Internal::AddRef(void)                                              \
  117. {                                                                           \
  118.     _class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
  119.     NS_PRECONDITION(PRInt32(agg->mRefCnt) >= 0, "illegal refcnt");          \
  120.     ++agg->mRefCnt;                                                         \
  121.     NS_LOG_ADDREF(this, agg->mRefCnt, #_class, sizeof(*this));              \
  122.     return agg->mRefCnt;                                                    \
  123. }                                                                           \
  124.                                                                             \
  125. NS_IMETHODIMP_(nsrefcnt)                                                    \
  126. _class::Internal::Release(void)                                             \
  127. {                                                                           \
  128.     _class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
  129.     NS_PRECONDITION(0 != agg->mRefCnt, "dup release");                      \
  130.     --agg->mRefCnt;                                                         \
  131.     NS_LOG_RELEASE(this, agg->mRefCnt, #_class);                            \
  132.     if (agg->mRefCnt == 0) {                                                \
  133.         agg->mRefCnt = 1; /* stabilize */                                   \
  134.         NS_DELETEXPCOM(agg);                                                \
  135.         return 0;                                                           \
  136.     }                                                                       \
  137.     return agg->mRefCnt;                                                    \
  138. }                                                                           \
  139.  
  140. // for use with QI macros in nsISupportsUtils.h:
  141.  
  142. #define NS_INTERFACE_MAP_BEGIN_AGGREGATED(_class)                           \
  143.   NS_IMPL_AGGREGATED_QUERY_HEAD(_class)
  144.  
  145. #define NS_IMPL_AGGREGATED_QUERY_HEAD(_class)                               \
  146. NS_IMETHODIMP                                                               \
  147. _class::AggregatedQueryInterface(REFNSIID aIID, void** aInstancePtr)        \
  148. {                                                                           \
  149.   NS_ASSERTION(aInstancePtr,                                                \
  150.                "AggregatedQueryInterface requires a non-NULL result ptr!"); \
  151.   if ( !aInstancePtr )                                                      \
  152.     return NS_ERROR_NULL_POINTER;                                           \
  153.   nsISupports* foundInterface;
  154.  
  155. #endif /* nsAgg_h___ */
  156.