The Tor Browser / file comparison
comparison: xpcom/glue/nsWeakReference.cpp
xpcom/glue/nsWeakReference.cpp
- changeset 0
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| -1:000000000000 | 0:a534765e5200 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 // nsWeakReference.cpp | |
| 8 | |
| 9 #include "mozilla/Attributes.h" | |
| 10 | |
| 11 #include "nsWeakReference.h" | |
| 12 #include "nsCOMPtr.h" | |
| 13 | |
| 14 class nsWeakReference MOZ_FINAL : public nsIWeakReference | |
| 15 { | |
| 16 public: | |
| 17 // nsISupports... | |
| 18 NS_DECL_ISUPPORTS | |
| 19 | |
| 20 // nsIWeakReference... | |
| 21 NS_DECL_NSIWEAKREFERENCE | |
| 22 | |
| 23 private: | |
| 24 friend class nsSupportsWeakReference; | |
| 25 | |
| 26 nsWeakReference( nsSupportsWeakReference* referent ) | |
| 27 : mReferent(referent) | |
| 28 // ...I can only be constructed by an |nsSupportsWeakReference| | |
| 29 { | |
| 30 // nothing else to do here | |
| 31 } | |
| 32 | |
| 33 ~nsWeakReference() | |
| 34 // ...I will only be destroyed by calling |delete| myself. | |
| 35 { | |
| 36 if ( mReferent ) | |
| 37 mReferent->NoticeProxyDestruction(); | |
| 38 } | |
| 39 | |
| 40 void | |
| 41 NoticeReferentDestruction() | |
| 42 // ...called (only) by an |nsSupportsWeakReference| from _its_ dtor. | |
| 43 { | |
| 44 mReferent = 0; | |
| 45 } | |
| 46 | |
| 47 nsSupportsWeakReference* mReferent; | |
| 48 }; | |
| 49 | |
| 50 nsresult | |
| 51 nsQueryReferent::operator()( const nsIID& aIID, void** answer ) const | |
| 52 { | |
| 53 nsresult status; | |
| 54 if ( mWeakPtr ) | |
| 55 { | |
| 56 if ( NS_FAILED(status = mWeakPtr->QueryReferent(aIID, answer)) ) | |
| 57 *answer = 0; | |
| 58 } | |
| 59 else | |
| 60 status = NS_ERROR_NULL_POINTER; | |
| 61 | |
| 62 if ( mErrorPtr ) | |
| 63 *mErrorPtr = status; | |
| 64 return status; | |
| 65 } | |
| 66 | |
| 67 NS_COM_GLUE nsIWeakReference* // or else |already_AddRefed<nsIWeakReference>| | |
| 68 NS_GetWeakReference( nsISupports* aInstancePtr, nsresult* aErrorPtr ) | |
| 69 { | |
| 70 nsresult status; | |
| 71 | |
| 72 nsIWeakReference* result = nullptr; | |
| 73 | |
| 74 if ( aInstancePtr ) | |
| 75 { | |
| 76 nsCOMPtr<nsISupportsWeakReference> factoryPtr = do_QueryInterface(aInstancePtr, &status); | |
| 77 if ( factoryPtr ) | |
| 78 { | |
| 79 status = factoryPtr->GetWeakReference(&result); | |
| 80 } | |
| 81 // else, |status| has already been set by |do_QueryInterface| | |
| 82 } | |
| 83 else | |
| 84 status = NS_ERROR_NULL_POINTER; | |
| 85 | |
| 86 if ( aErrorPtr ) | |
| 87 *aErrorPtr = status; | |
| 88 return result; | |
| 89 } | |
| 90 | |
| 91 NS_COM_GLUE nsresult | |
| 92 nsSupportsWeakReference::GetWeakReference( nsIWeakReference** aInstancePtr ) | |
| 93 { | |
| 94 if ( !aInstancePtr ) | |
| 95 return NS_ERROR_NULL_POINTER; | |
| 96 | |
| 97 if ( !mProxy ) | |
| 98 mProxy = new nsWeakReference(this); | |
| 99 *aInstancePtr = mProxy; | |
| 100 | |
| 101 nsresult status; | |
| 102 if ( !*aInstancePtr ) | |
| 103 status = NS_ERROR_OUT_OF_MEMORY; | |
| 104 else | |
| 105 { | |
| 106 NS_ADDREF(*aInstancePtr); | |
| 107 status = NS_OK; | |
| 108 } | |
| 109 | |
| 110 return status; | |
| 111 } | |
| 112 | |
| 113 NS_IMPL_ISUPPORTS(nsWeakReference, nsIWeakReference) | |
| 114 | |
| 115 NS_IMETHODIMP | |
| 116 nsWeakReference::QueryReferent( const nsIID& aIID, void** aInstancePtr ) | |
| 117 { | |
| 118 return mReferent ? mReferent->QueryInterface(aIID, aInstancePtr) : NS_ERROR_NULL_POINTER; | |
| 119 } | |
| 120 | |
| 121 void | |
| 122 nsSupportsWeakReference::ClearWeakReferences() | |
| 123 { | |
| 124 if ( mProxy ) | |
| 125 { | |
| 126 mProxy->NoticeReferentDestruction(); | |
| 127 mProxy = 0; | |
| 128 } | |
| 129 } | |
| 130 |
