michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim: set ts=2 et sw=2 tw=80: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef mozilla_net_AutoClose_h
michael@0: #define mozilla_net_AutoClose_h
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: 
michael@0: namespace mozilla { namespace net {
michael@0: 
michael@0: // Like an nsAutoPtr for XPCOM streams (e.g. nsIAsyncInputStream) and other
michael@0: // refcounted classes that need to have the Close() method called explicitly
michael@0: // before they are destroyed.
michael@0: template <typename T>
michael@0: class AutoClose
michael@0: {
michael@0: public:
michael@0:   AutoClose() { } 
michael@0:   ~AutoClose(){
michael@0:     Close();
michael@0:   }
michael@0: 
michael@0:   operator bool() const
michael@0:   {
michael@0:     return mPtr;
michael@0:   }
michael@0: 
michael@0:   already_AddRefed<T> forget()
michael@0:   {
michael@0:     return mPtr.forget();
michael@0:   }
michael@0: 
michael@0:   void takeOver(nsCOMPtr<T> & rhs)
michael@0:   {
michael@0:     Close();
michael@0:     mPtr = rhs.forget();
michael@0:   }
michael@0: 
michael@0:   void takeOver(AutoClose<T> & rhs)
michael@0:   {
michael@0:     Close();
michael@0:     mPtr = rhs.mPtr.forget();
michael@0:   }
michael@0: 
michael@0:   void CloseAndRelease()
michael@0:   {
michael@0:     Close();
michael@0:     mPtr = nullptr;
michael@0:   }
michael@0: 
michael@0:   T* operator->() const
michael@0:   {
michael@0:     return mPtr.operator->();
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   void Close()
michael@0:   {
michael@0:     if (mPtr) {
michael@0:       mPtr->Close();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   void operator=(const AutoClose<T> &) MOZ_DELETE;
michael@0:   AutoClose(const AutoClose<T> &) MOZ_DELETE;
michael@0: 
michael@0:   nsCOMPtr<T> mPtr;
michael@0: };
michael@0: 
michael@0: } } // namespace mozilla::net
michael@0: 
michael@0: #endif // mozilla_net_AutoClose_h