mirror of
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109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla FastLoad code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brendan Eich <brendan@mozilla.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsFastLoadPtr_h___
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#define nsFastLoadPtr_h___
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/**
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* Mozilla FastLoad file object pointer template type.
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*
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* Use nsFastLoadPtr<T> rather than nsCOMPtr<T> when declaring a strong XPCOM
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* ref member of a data structure that's conditionally loaded at application
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* startup. You must be willing to tolerate the null mRawPtr test on every
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* dereference of this member pointer, or else copy it to a local to optimize
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* away the cost.
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*/
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#ifndef nsCOMPtr_h___
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#include "nsCOMPtr.h"
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#endif
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#ifndef nsIFastLoadService_h___
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#include "nsIFastLoadService.h"
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#endif
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/**
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* nsFastLoadPtr is a template class, so we don't want a class static service
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* pointer member declared in nsFastLoadPtr, above. Plus, we need special
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* declaration magic to export data across DLL/DSO boundaries. So we use an
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* old-fashioned global variable that refers weakly to the one true FastLoad
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* service. This pointer is maintained by that singleton's ctor and dtor.
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*/
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PR_EXPORT_DATA(nsIFastLoadService*) gFastLoadService_;
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template <class T>
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class nsFastLoadPtr : public nsCOMPtr<T> {
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public:
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nsDerivedSafe<T>* get() const {
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if (!this->mRawPtr) {
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gFastLoadService_->GetFastLoadReferent(
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NS_REINTERPRET_CAST(nsISupports**,
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&this->mRawPtr));
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}
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return NS_REINTERPRET_CAST(nsDerivedSafe<T>*, this->mRawPtr);
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}
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/**
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* Deserialize an nsFastLoadPtr from aInputStream, skipping the referent
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* object, but saving the object's offset for later deserialization.
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*
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* Lowercase name _a la_ get, because it's called the same way -- not via
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* operator->().
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*/
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nsresult read(nsIObjectInputStream* aInputStream) {
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return gFastLoadService_->ReadFastLoadPtr(aInputStream,
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NS_REINTERPRET_CAST(nsISupports**,
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&this->mRawPtr));
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}
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/**
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* Serialize an nsFastLoadPtr reference and possibly the referent object,
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* if that object has not yet been serialized.
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*
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* Lowercase name _a la_ get, because it's called the same way -- not via
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* operator->().
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*/
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nsresult write(nsIObjectOutputStream* aOutputStream) {
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return gFastLoadService_->WriteFastLoadPtr(aOutputStream,
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NS_REINTERPRET_CAST(nsISupports*,
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this->mRawPtr));
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}
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};
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#endif // nsFastLoadPtr_h___
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