LCOV - code coverage report
Current view: directory - xpcom/ds - nsObserverList.h (source / functions) Found Hit Coverage
Test: app.info Lines: 16 16 100.0 %
Date: 2012-06-02 Functions: 10 10 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       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 nsObserverList_h___
      39                 : #define nsObserverList_h___
      40                 : 
      41                 : #include "nsISupports.h"
      42                 : #include "nsTArray.h"
      43                 : #include "nsCOMPtr.h"
      44                 : #include "nsCOMArray.h"
      45                 : #include "nsIObserver.h"
      46                 : #include "nsIWeakReference.h"
      47                 : #include "nsHashKeys.h"
      48                 : #include "nsISimpleEnumerator.h"
      49                 : 
      50                 : struct ObserverRef
      51          156587 : {
      52           59180 :   ObserverRef(const ObserverRef& o) :
      53           59180 :     isWeakRef(o.isWeakRef), ref(o.ref) { }
      54                 :   
      55           37518 :   ObserverRef(nsIObserver* aObserver) : isWeakRef(false), ref(aObserver) { }
      56           59889 :   ObserverRef(nsIWeakReference* aWeak) : isWeakRef(true), ref(aWeak) { }
      57                 : 
      58                 :   bool isWeakRef;
      59                 :   nsCOMPtr<nsISupports> ref;
      60                 : 
      61           20426 :   nsIObserver* asObserver() {
      62           20426 :     NS_ASSERTION(!isWeakRef, "Isn't a strong ref.");
      63           20426 :     return static_cast<nsIObserver*>((nsISupports*) ref);
      64                 :   }
      65                 : 
      66           38766 :   nsIWeakReference* asWeak() {
      67           38766 :     NS_ASSERTION(isWeakRef, "Isn't a weak ref.");
      68           38766 :     return static_cast<nsIWeakReference*>((nsISupports*) ref);
      69                 :   }
      70                 : 
      71          157878 :   bool operator==(nsISupports* b) const { return ref == b; }
      72                 : };
      73                 : 
      74                 : class nsObserverList : public nsCharPtrHashKey
      75                 : {
      76                 : public:
      77           44597 :   nsObserverList(const char *key) : nsCharPtrHashKey(key)
      78           44597 :   { MOZ_COUNT_CTOR(nsObserverList); }
      79                 : 
      80           44597 :   ~nsObserverList() { MOZ_COUNT_DTOR(nsObserverList); }
      81                 : 
      82                 :   nsresult AddObserver(nsIObserver* anObserver, bool ownsWeak);
      83                 :   nsresult RemoveObserver(nsIObserver* anObserver);
      84                 : 
      85                 :   void NotifyObservers(nsISupports *aSubject,
      86                 :                        const char *aTopic,
      87                 :                        const PRUnichar *someData);
      88                 :   nsresult GetObserverList(nsISimpleEnumerator** anEnumerator);
      89                 : 
      90                 :   // Fill an array with the observers of this category.
      91                 :   // The array is filled in last-added-first order.
      92                 :   void FillObserverArray(nsCOMArray<nsIObserver> &aArray);
      93                 : 
      94                 : private:
      95                 :   nsTArray<ObserverRef> mObservers;
      96                 : };
      97                 : 
      98                 : class nsObserverEnumerator : public nsISimpleEnumerator
      99                 : {
     100                 : public:
     101                 :     NS_DECL_ISUPPORTS
     102                 :     NS_DECL_NSISIMPLEENUMERATOR
     103                 : 
     104                 :     nsObserverEnumerator(nsObserverList* aObserverList);
     105                 : 
     106                 : private:
     107             978 :     ~nsObserverEnumerator() { }
     108                 : 
     109                 :     PRInt32 mIndex; // Counts up from 0
     110                 :     nsCOMArray<nsIObserver> mObservers;
     111                 : };
     112                 : 
     113                 : #endif /* nsObserverList_h___ */

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