pjs/xpcom/sample/nsSampleFactory.cpp

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5.4 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
A sample of XPConnect. This file contains the XPCOM factory the
creates for SampleImpl objects.
*/
#include "nsCOMPtr.h"
#include "nscore.h"
#include "nsISample.h"
#include "nsIComponentManager.h"
#include "nsIServiceManager.h"
#include "nsXPComFactory.h"
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
static NS_DEFINE_CID(kComponentManagerCID, NS_COMPONENTMANAGER_CID);
static NS_DEFINE_CID(kSampleCID, NS_SAMPLE_CID);
class SampleFactoryImpl : public nsIFactory
{
public:
SampleFactoryImpl(const nsCID &aClass, const char* className, const char* progID);
// nsISupports methods
NS_DECL_ISUPPORTS
// nsIFactory methods
NS_IMETHOD CreateInstance(nsISupports *aOuter,
const nsIID &aIID,
void **aResult);
NS_IMETHOD LockFactory(PRBool aLock);
protected:
virtual ~SampleFactoryImpl();
protected:
nsCID mClassID;
const char* mClassName;
const char* mProgID;
};
////////////////////////////////////////////////////////////////////////
SampleFactoryImpl::SampleFactoryImpl(const nsCID &aClass,
const char* className,
const char* progID)
: mClassID(aClass), mClassName(className), mProgID(progID)
{
NS_INIT_REFCNT();
}
SampleFactoryImpl::~SampleFactoryImpl()
{
NS_ASSERTION(mRefCnt == 0, "non-zero refcnt at destruction");
}
NS_IMETHODIMP
SampleFactoryImpl::QueryInterface(const nsIID &aIID, void **aResult)
{
if (! aResult)
return NS_ERROR_NULL_POINTER;
// Always NULL result, in case of failure
*aResult = nsnull;
if (aIID.Equals(kISupportsIID)) {
*aResult = NS_STATIC_CAST(nsISupports*, this);
AddRef();
return NS_OK;
} else if (aIID.Equals(kIFactoryIID)) {
*aResult = NS_STATIC_CAST(nsIFactory*, this);
AddRef();
return NS_OK;
}
return NS_NOINTERFACE;
}
NS_IMPL_ADDREF(SampleFactoryImpl);
NS_IMPL_RELEASE(SampleFactoryImpl);
NS_IMETHODIMP
SampleFactoryImpl::CreateInstance(nsISupports *aOuter,
const nsIID &aIID,
void **aResult)
{
if (! aResult)
return NS_ERROR_NULL_POINTER;
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
*aResult = nsnull;
nsresult rv;
nsISupports *inst = nsnull;
if (mClassID.Equals(kSampleCID)) {
if (NS_FAILED(rv = NS_NewSample((nsISample**) &inst)))
return rv;
}
else {
return NS_ERROR_NO_INTERFACE;
}
if (! inst)
return NS_ERROR_OUT_OF_MEMORY;
if (NS_FAILED(rv = inst->QueryInterface(aIID, aResult))) {
// We didn't get the right interface.
NS_ERROR("didn't support the interface you wanted");
}
NS_IF_RELEASE(inst);
return rv;
}
nsresult SampleFactoryImpl::LockFactory(PRBool aLock)
{
// Not implemented in simplest case.
return NS_OK;
}
////////////////////////////////////////////////////////////////////////
// return the proper factory to the caller
extern "C" PR_IMPLEMENT(nsresult)
NSGetFactory(nsISupports* aServMgr,
const nsCID &aClass,
const char *aClassName,
const char *aProgID,
nsIFactory **aFactory)
{
if (! aFactory)
return NS_ERROR_NULL_POINTER;
SampleFactoryImpl* factory = new SampleFactoryImpl(aClass, aClassName, aProgID);
if (factory == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(factory);
*aFactory = factory;
return NS_OK;
}
extern "C" PR_IMPLEMENT(nsresult)
NSRegisterSelf(nsISupports* aServMgr , const char* aPath)
{
nsresult rv;
nsCOMPtr<nsIServiceManager> servMgr(do_QueryInterface(aServMgr, &rv));
if (NS_FAILED(rv)) return rv;
NS_WITH_SERVICE(nsIComponentManager, compMgr, kComponentManagerCID, &rv);
if (NS_FAILED(rv)) return rv;
rv = compMgr->RegisterComponent(kSampleCID,
"Sample World Component",
"component://netscape/sample/sample-world",
aPath, PR_TRUE, PR_TRUE);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
extern "C" PR_IMPLEMENT(nsresult)
NSUnregisterSelf(nsISupports* aServMgr, const char* aPath)
{
nsresult rv;
nsCOMPtr<nsIServiceManager> servMgr(do_QueryInterface(aServMgr, &rv));
if (NS_FAILED(rv)) return rv;
NS_WITH_SERVICE(nsIComponentManager, compMgr, kComponentManagerCID, &rv);
if (NS_FAILED(rv)) return rv;
rv = compMgr->UnregisterComponent(kSampleCID, aPath);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}