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comparison: xpcom/ds/nsObserverList.cpp
xpcom/ds/nsObserverList.cpp
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:473d4d21fdf5 |
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsObserverList.h" | |
| 7 | |
| 8 #include "nsAutoPtr.h" | |
| 9 #include "nsCOMArray.h" | |
| 10 #include "nsISimpleEnumerator.h" | |
| 11 #include "xpcpublic.h" | |
| 12 | |
| 13 nsresult | |
| 14 nsObserverList::AddObserver(nsIObserver* anObserver, bool ownsWeak) | |
| 15 { | |
| 16 NS_ASSERTION(anObserver, "Null input"); | |
| 17 | |
| 18 if (!ownsWeak) { | |
| 19 ObserverRef* o = mObservers.AppendElement(anObserver); | |
| 20 if (!o) | |
| 21 return NS_ERROR_OUT_OF_MEMORY; | |
| 22 | |
| 23 return NS_OK; | |
| 24 } | |
| 25 | |
| 26 nsCOMPtr<nsIWeakReference> weak = do_GetWeakReference(anObserver); | |
| 27 if (!weak) | |
| 28 return NS_NOINTERFACE; | |
| 29 | |
| 30 ObserverRef *o = mObservers.AppendElement(weak); | |
| 31 if (!o) | |
| 32 return NS_ERROR_OUT_OF_MEMORY; | |
| 33 | |
| 34 return NS_OK; | |
| 35 } | |
| 36 | |
| 37 nsresult | |
| 38 nsObserverList::RemoveObserver(nsIObserver* anObserver) | |
| 39 { | |
| 40 NS_ASSERTION(anObserver, "Null input"); | |
| 41 | |
| 42 if (mObservers.RemoveElement(static_cast<nsISupports*>(anObserver))) | |
| 43 return NS_OK; | |
| 44 | |
| 45 nsCOMPtr<nsIWeakReference> observerRef = do_GetWeakReference(anObserver); | |
| 46 if (!observerRef) | |
| 47 return NS_ERROR_FAILURE; | |
| 48 | |
| 49 if (!mObservers.RemoveElement(observerRef)) | |
| 50 return NS_ERROR_FAILURE; | |
| 51 | |
| 52 return NS_OK; | |
| 53 } | |
| 54 | |
| 55 nsresult | |
| 56 nsObserverList::GetObserverList(nsISimpleEnumerator** anEnumerator) | |
| 57 { | |
| 58 nsRefPtr<nsObserverEnumerator> e(new nsObserverEnumerator(this)); | |
| 59 e.forget(anEnumerator); | |
| 60 return NS_OK; | |
| 61 } | |
| 62 | |
| 63 void | |
| 64 nsObserverList::FillObserverArray(nsCOMArray<nsIObserver> &aArray) | |
| 65 { | |
| 66 aArray.SetCapacity(mObservers.Length()); | |
| 67 | |
| 68 nsTArray<ObserverRef> observers(mObservers); | |
| 69 | |
| 70 for (int32_t i = observers.Length() - 1; i >= 0; --i) { | |
| 71 if (observers[i].isWeakRef) { | |
| 72 nsCOMPtr<nsIObserver> o(do_QueryReferent(observers[i].asWeak())); | |
| 73 if (o) { | |
| 74 aArray.AppendObject(o); | |
| 75 } | |
| 76 else { | |
| 77 // the object has gone away, remove the weakref | |
| 78 mObservers.RemoveElement(observers[i].asWeak()); | |
| 79 } | |
| 80 } | |
| 81 else { | |
| 82 aArray.AppendObject(observers[i].asObserver()); | |
| 83 } | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 void | |
| 88 nsObserverList::NotifyObservers(nsISupports *aSubject, | |
| 89 const char *aTopic, | |
| 90 const char16_t *someData) | |
| 91 { | |
| 92 nsCOMArray<nsIObserver> observers; | |
| 93 FillObserverArray(observers); | |
| 94 | |
| 95 for (int32_t i = 0; i < observers.Count(); ++i) { | |
| 96 observers[i]->Observe(aSubject, aTopic, someData); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 void | |
| 101 nsObserverList::UnmarkGrayStrongObservers() | |
| 102 { | |
| 103 for (uint32_t i = 0; i < mObservers.Length(); ++i) { | |
| 104 if (!mObservers[i].isWeakRef) { | |
| 105 xpc_TryUnmarkWrappedGrayObject(mObservers[i].asObserver()); | |
| 106 } | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 NS_IMPL_ISUPPORTS(nsObserverEnumerator, nsISimpleEnumerator) | |
| 111 | |
| 112 nsObserverEnumerator::nsObserverEnumerator(nsObserverList* aObserverList) | |
| 113 : mIndex(0) | |
| 114 { | |
| 115 aObserverList->FillObserverArray(mObservers); | |
| 116 } | |
| 117 | |
| 118 NS_IMETHODIMP | |
| 119 nsObserverEnumerator::HasMoreElements(bool *aResult) | |
| 120 { | |
| 121 *aResult = (mIndex < mObservers.Count()); | |
| 122 return NS_OK; | |
| 123 } | |
| 124 | |
| 125 NS_IMETHODIMP | |
| 126 nsObserverEnumerator::GetNext(nsISupports* *aResult) | |
| 127 { | |
| 128 if (mIndex == mObservers.Count()) { | |
| 129 NS_ERROR("Enumerating after HasMoreElements returned false."); | |
| 130 return NS_ERROR_UNEXPECTED; | |
| 131 } | |
| 132 | |
| 133 NS_ADDREF(*aResult = mObservers[mIndex]); | |
| 134 ++mIndex; | |
| 135 return NS_OK; | |
| 136 } |
