The Tor Browser / file comparison
comparison: js/xpconnect/src/xpcObjectHelper.h
js/xpconnect/src/xpcObjectHelper.h
- changeset 0
- 6474c204b198
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* vim: set ts=8 sts=4 et sw=4 tw=99: */ | |
| 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 #ifndef xpcObjectHelper_h | |
| 8 #define xpcObjectHelper_h | |
| 9 | |
| 10 // Including 'windows.h' will #define GetClassInfo to something else. | |
| 11 #ifdef XP_WIN | |
| 12 #ifdef GetClassInfo | |
| 13 #undef GetClassInfo | |
| 14 #endif | |
| 15 #endif | |
| 16 | |
| 17 #include "mozilla/Attributes.h" | |
| 18 #include <stdint.h> | |
| 19 #include "nsAutoPtr.h" | |
| 20 #include "nsCOMPtr.h" | |
| 21 #include "nsIClassInfo.h" | |
| 22 #include "nsISupports.h" | |
| 23 #include "nsIXPCScriptable.h" | |
| 24 #include "nsWrapperCache.h" | |
| 25 | |
| 26 class xpcObjectHelper | |
| 27 { | |
| 28 public: | |
| 29 xpcObjectHelper(nsISupports *aObject, nsWrapperCache *aCache = nullptr) | |
| 30 : mCanonical(nullptr) | |
| 31 , mObject(aObject) | |
| 32 , mCache(aCache) | |
| 33 { | |
| 34 if (!mCache) { | |
| 35 if (aObject) | |
| 36 CallQueryInterface(aObject, &mCache); | |
| 37 else | |
| 38 mCache = nullptr; | |
| 39 } | |
| 40 } | |
| 41 | |
| 42 nsISupports *Object() | |
| 43 { | |
| 44 return mObject; | |
| 45 } | |
| 46 | |
| 47 nsISupports *GetCanonical() | |
| 48 { | |
| 49 if (!mCanonical) { | |
| 50 mCanonicalStrong = do_QueryInterface(mObject); | |
| 51 mCanonical = mCanonicalStrong; | |
| 52 } | |
| 53 return mCanonical; | |
| 54 } | |
| 55 | |
| 56 already_AddRefed<nsISupports> forgetCanonical() | |
| 57 { | |
| 58 MOZ_ASSERT(mCanonical, "Huh, no canonical to forget?"); | |
| 59 | |
| 60 if (!mCanonicalStrong) | |
| 61 mCanonicalStrong = mCanonical; | |
| 62 mCanonical = nullptr; | |
| 63 return mCanonicalStrong.forget(); | |
| 64 } | |
| 65 | |
| 66 nsIClassInfo *GetClassInfo() | |
| 67 { | |
| 68 if (mXPCClassInfo) | |
| 69 return mXPCClassInfo; | |
| 70 if (!mClassInfo) | |
| 71 mClassInfo = do_QueryInterface(mObject); | |
| 72 return mClassInfo; | |
| 73 } | |
| 74 nsXPCClassInfo *GetXPCClassInfo() | |
| 75 { | |
| 76 if (!mXPCClassInfo) { | |
| 77 CallQueryInterface(mObject, getter_AddRefs(mXPCClassInfo)); | |
| 78 } | |
| 79 return mXPCClassInfo; | |
| 80 } | |
| 81 | |
| 82 already_AddRefed<nsXPCClassInfo> forgetXPCClassInfo() | |
| 83 { | |
| 84 GetXPCClassInfo(); | |
| 85 | |
| 86 return mXPCClassInfo.forget(); | |
| 87 } | |
| 88 | |
| 89 // We assert that we can reach an nsIXPCScriptable somehow. | |
| 90 uint32_t GetScriptableFlags() | |
| 91 { | |
| 92 // Try getting an nsXPCClassInfo - this handles DOM scriptable helpers. | |
| 93 nsCOMPtr<nsIXPCScriptable> sinfo = GetXPCClassInfo(); | |
| 94 | |
| 95 // If that didn't work, try just QI-ing. This handles BackstagePass. | |
| 96 if (!sinfo) | |
| 97 sinfo = do_QueryInterface(GetCanonical()); | |
| 98 | |
| 99 // We should have something by now. | |
| 100 MOZ_ASSERT(sinfo); | |
| 101 | |
| 102 // Grab the flags. | |
| 103 return sinfo->GetScriptableFlags(); | |
| 104 } | |
| 105 | |
| 106 nsWrapperCache *GetWrapperCache() | |
| 107 { | |
| 108 return mCache; | |
| 109 } | |
| 110 | |
| 111 protected: | |
| 112 xpcObjectHelper(nsISupports *aObject, nsISupports *aCanonical, | |
| 113 nsWrapperCache *aCache) | |
| 114 : mCanonical(aCanonical) | |
| 115 , mObject(aObject) | |
| 116 , mCache(aCache) | |
| 117 { | |
| 118 if (!mCache && aObject) | |
| 119 CallQueryInterface(aObject, &mCache); | |
| 120 } | |
| 121 | |
| 122 nsCOMPtr<nsISupports> mCanonicalStrong; | |
| 123 nsISupports* mCanonical; | |
| 124 | |
| 125 private: | |
| 126 xpcObjectHelper(xpcObjectHelper& aOther) MOZ_DELETE; | |
| 127 | |
| 128 nsISupports* mObject; | |
| 129 nsWrapperCache* mCache; | |
| 130 nsCOMPtr<nsIClassInfo> mClassInfo; | |
| 131 nsRefPtr<nsXPCClassInfo> mXPCClassInfo; | |
| 132 }; | |
| 133 | |
| 134 #endif |
