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