LCOV - code coverage report
Current view: directory - objdir/xpcom/build - nsWeakReference.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 49 45 91.8 %
Date: 2012-06-02 Functions: 11 11 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is the Mozilla browser.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications, Inc.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 1999
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Scott Collins <scc@netscape.com>
      25                 :  *   Pierre Phaneuf <pp@ludusdesign.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      29                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : // nsWeakReference.cpp
      42                 : 
      43                 : #include "mozilla/Attributes.h"
      44                 : 
      45                 : #include "nsWeakReference.h"
      46                 : #include "nsCOMPtr.h"
      47                 : 
      48                 : class nsWeakReference MOZ_FINAL : public nsIWeakReference
      49                 :   {
      50                 :     public:
      51                 :     // nsISupports...
      52                 :       NS_DECL_ISUPPORTS
      53                 : 
      54                 :     // nsIWeakReference...
      55                 :       NS_DECL_NSIWEAKREFERENCE
      56                 : 
      57                 :     private:
      58                 :       friend class nsSupportsWeakReference;
      59                 : 
      60           37845 :       nsWeakReference( nsSupportsWeakReference* referent )
      61           37845 :           : mReferent(referent)
      62                 :           // ...I can only be constructed by an |nsSupportsWeakReference|
      63                 :         {
      64                 :           // nothing else to do here
      65           37845 :         }
      66                 : 
      67           37832 :       ~nsWeakReference()
      68                 :            // ...I will only be destroyed by calling |delete| myself.
      69           37832 :         {
      70           37832 :           if ( mReferent )
      71           23786 :             mReferent->NoticeProxyDestruction();
      72           37832 :         }
      73                 : 
      74                 :       void
      75           14057 :       NoticeReferentDestruction()
      76                 :           // ...called (only) by an |nsSupportsWeakReference| from _its_ dtor.
      77                 :         {
      78           14057 :           mReferent = 0;
      79           14057 :         }
      80                 : 
      81                 :       nsSupportsWeakReference*  mReferent;
      82                 :   };
      83                 : 
      84                 : nsresult
      85           61803 : nsQueryReferent::operator()( const nsIID& aIID, void** answer ) const
      86                 :   {
      87                 :     nsresult status;
      88           61803 :     if ( mWeakPtr )
      89                 :       {
      90           41163 :         if ( NS_FAILED(status = mWeakPtr->QueryReferent(aIID, answer)) )
      91             306 :           *answer = 0;
      92                 :       }
      93                 :     else
      94           20640 :       status = NS_ERROR_NULL_POINTER;
      95                 : 
      96           61803 :     if ( mErrorPtr )
      97               0 :       *mErrorPtr = status;
      98           61803 :     return status;
      99                 :   }
     100                 : 
     101                 : NS_COM_GLUE nsIWeakReference*  // or else |already_AddRefed<nsIWeakReference>|
     102          108279 : NS_GetWeakReference( nsISupports* aInstancePtr, nsresult* aErrorPtr )
     103                 :   {
     104                 :     nsresult status;
     105                 : 
     106          108279 :     nsIWeakReference* result = nsnull;
     107                 : 
     108          108279 :     if ( aInstancePtr )
     109                 :       {
     110          210014 :         nsCOMPtr<nsISupportsWeakReference> factoryPtr = do_QueryInterface(aInstancePtr, &status);
     111          105007 :         NS_ASSERTION(factoryPtr, "Oops!  You're asking for a weak reference to an object that doesn't support that.");
     112          105007 :         if ( factoryPtr )
     113                 :           {
     114          105007 :             status = factoryPtr->GetWeakReference(&result);
     115                 :           }
     116                 :         // else, |status| has already been set by |do_QueryInterface|
     117                 :       }
     118                 :     else
     119            3272 :       status = NS_ERROR_NULL_POINTER;
     120                 : 
     121          108279 :     if ( aErrorPtr )
     122               0 :       *aErrorPtr = status;
     123          108279 :     return result;
     124                 :   }
     125                 : 
     126                 : NS_COM_GLUE nsresult
     127          109558 : nsSupportsWeakReference::GetWeakReference( nsIWeakReference** aInstancePtr )
     128                 :   {
     129          109558 :     if ( !aInstancePtr )
     130               0 :       return NS_ERROR_NULL_POINTER;
     131                 : 
     132          109558 :     if ( !mProxy )
     133           37845 :       mProxy = new nsWeakReference(this);
     134          109558 :     *aInstancePtr = mProxy;
     135                 : 
     136                 :     nsresult status;
     137          109558 :     if ( !*aInstancePtr )
     138               0 :       status = NS_ERROR_OUT_OF_MEMORY;
     139                 :     else
     140                 :       {
     141          109558 :         NS_ADDREF(*aInstancePtr);
     142          109558 :         status = NS_OK;
     143                 :       }
     144                 : 
     145          109558 :     return status;
     146                 :   }
     147                 : 
     148          909016 : NS_IMPL_ISUPPORTS1(nsWeakReference, nsIWeakReference)
     149                 : 
     150                 : NS_IMETHODIMP
     151          573597 : nsWeakReference::QueryReferent( const nsIID& aIID, void** aInstancePtr )
     152                 :   {
     153          573597 :     return mReferent ? mReferent->QueryInterface(aIID, aInstancePtr) : NS_ERROR_NULL_POINTER;
     154                 :   }
     155                 : 
     156                 : void
     157          244459 : nsSupportsWeakReference::ClearWeakReferences()
     158                 :         {
     159          244459 :                 if ( mProxy )
     160                 :                         {
     161           14057 :                                 mProxy->NoticeReferentDestruction();
     162           14057 :                                 mProxy = 0;
     163                 :                         }
     164          244459 :         }
     165                 : 

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