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
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12 : * for the specific language governing rights and limitations under the
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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.
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22 : * Contributor(s):
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
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26 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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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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