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159 lines
7.9 KiB
C++
159 lines
7.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#ifndef nsXPComFactory_h__
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#define nsXPComFactory_h__
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#include "nsIFactory.h"
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/*
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* This file contains a macro for the implementation of a simple XPCOM factory.
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*
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* To implement a factory for a given component, you need to declare the
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* factory class using the NS_DEF_FACTORY() macro.
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*
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* The first macro argument is the name for the factory.
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*
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* The second macro argument is a function (provided by you) which
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* can be called by your DLL's NSGetFactory(...) entry point.
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*
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* Example:
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*
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* NS_DEF_FACTORY(SomeComponent,SomeComponentImpl)
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*
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* Declares:
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*
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* class nsSomeComponentFactory : public nsIFactory {};
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*
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* NOTE that the NS_DEF_FACTORY takes care of enforcing the "ns" prefix
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* and appending the "Factory" suffix to the given name.
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*
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* To use the new factory:
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*
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* nsresult NS_New_SomeComponent_Factory(nsIFactory** aResult)
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* {
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* nsresult rv = NS_OK;
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* nsIFactory* inst = new nsSomeComponentFactory;
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* if (NULL == inst) {
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* rv = NS_ERROR_OUT_OF_MEMORY;
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* } else {
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* NS_ADDREF(inst);
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* }
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* *aResult = inst;
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* return rv;
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* }
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*
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* NOTE:
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* ----
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* The factories created by this macro are not thread-safe and do not
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* support aggregation.
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*
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*/
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#define NS_DEF_FACTORY(_name,_type) \
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class ns##_name##Factory : public nsIFactory \
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{ \
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public: \
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ns##_name##Factory() { NS_INIT_REFCNT(); } \
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\
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NS_IMETHOD_(nsrefcnt) AddRef (void) \
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{ \
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return ++mRefCnt; \
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} \
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\
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NS_IMETHOD_(nsrefcnt) Release(void) \
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{ \
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NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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if (--mRefCnt == 0) { \
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NS_DELETEXPCOM(this); \
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return 0; \
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} \
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return mRefCnt; \
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} \
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\
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) \
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{ \
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if (NULL == aInstancePtr) { \
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return NS_ERROR_NULL_POINTER; \
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} \
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\
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*aInstancePtr = NULL; \
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\
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static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID); \
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
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if (aIID.Equals(kIFactoryIID)) { \
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*aInstancePtr = (void*) this; \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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if (aIID.Equals(kISupportsIID)) { \
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*aInstancePtr = (void*) ((nsISupports*)this); \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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return NS_NOINTERFACE; \
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} \
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\
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NS_IMETHOD CreateInstance(nsISupports *aOuter, \
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const nsIID &aIID, \
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void **aResult) \
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{ \
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nsresult rv; \
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\
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_type * inst; \
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\
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if (NULL == aResult) { \
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rv = NS_ERROR_NULL_POINTER; \
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goto done; \
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} \
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*aResult = NULL; \
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if (NULL != aOuter) { \
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rv = NS_ERROR_NO_AGGREGATION; \
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goto done; \
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} \
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\
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NS_NEWXPCOM(inst, _type); \
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if (NULL == inst) { \
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rv = NS_ERROR_OUT_OF_MEMORY; \
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goto done; \
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} \
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NS_ADDREF(inst); \
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rv = inst->QueryInterface(aIID, aResult); \
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NS_RELEASE(inst); \
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\
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done: \
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return rv; \
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} \
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\
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NS_IMETHOD LockFactory(PRBool aLock) \
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{ \
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return NS_OK; \
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} \
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\
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\
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protected: \
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virtual ~ns##_name##Factory() \
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{ \
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NS_ASSERTION(mRefCnt == 0, "non-zero refcnt at destruction"); \
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} \
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\
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nsrefcnt mRefCnt; \
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};
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#endif /* nsXPComFactory_h__ */
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