mirror of
https://github.com/mozilla/gecko-dev.git
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248 lines
7.3 KiB
C++
248 lines
7.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsISupports.h"
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////////////////////////////////////////////////////////////////////////////////
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// nsIFoo.h
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////////////////////////////////////////////////////////////////////////////////
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// Here's an interface that we're going to work with. Normally it would be
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// defined in nsIFoo.h:
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#define NS_IFOO_IID \
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{ /* f981ba10-1547-11d3-9337-00104ba0fd40 */ \
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0xf981ba10, \
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0x1547, \
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0x11d3, \
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{0x93, 0x37, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
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}
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#define NS_FOO_CID \
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{ /* fe1a5870-1547-11d3-9337-00104ba0fd40 */ \
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0xfe1a5870, \
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0x1547, \
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0x11d3, \
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{0x93, 0x37, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
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}
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class nsIFoo : public nsISupports {
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IFOO_IID);
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NS_IMETHOD Init(const char* name) = 0;
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NS_IMETHOD Doit(int x) = 0;
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};
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// Define a global constructor function if you really need one. Otherwise
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// you can always use nsIComponentManager::CreateInstance.
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PR_EXTERN(nsresult)
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NS_NewFoo(nsIFoo* *result, const char* name);
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////////////////////////////////////////////////////////////////////////////////
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// nsFoo.h
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////////////////////////////////////////////////////////////////////////////////
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// Here's the implementation class definition. Put this in an nsFoo.h (and don't
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// export it to dist).
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//#include "nsIFoo.h"
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class nsFoo : public nsIFoo {
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public:
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// Define the constructor, but don't give it arguments that are needed
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// for initialization that can fail:
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nsFoo();
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// Always make the destructor virtual:
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virtual ~nsFoo();
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// Define a Create method to be used with a factory:
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static NS_METHOD
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Create(nsISupports* aOuter, const nsIID& aIID, void* *aResult);
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// from nsIFoo:
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NS_IMETHOD Init(const char* name);
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NS_IMETHOD Doit(int x);
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// from nsISupports:
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NS_DECL_ISUPPORTS
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protected:
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// instance variables:
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char* mName;
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};
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////////////////////////////////////////////////////////////////////////////////
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// nsFoo.cpp
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////////////////////////////////////////////////////////////////////////////////
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// Here's the implementation. Put this in an nsFoo.cpp.
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//#include "nsFoo.h"
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#include "nsCRT.h"
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#include <stdio.h>
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// Don't do anything in the constructor that can fail. Just initialize all
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// the instance variables and get out:
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nsFoo::nsFoo()
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: mName(NULL)
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{
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NS_INIT_REFCNT();
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}
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// Do anything that can fail in the Init method. It's a good idea to provide
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// one so that in the future if someone adds something that can fail they'll
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// be encouraged to do it right:
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NS_IMETHODIMP
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nsFoo::Init(const char* name)
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{
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mName = nsCRT::strdup(name);
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if (mName == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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// Destroy and release things as usual in the destructor:
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nsFoo::~nsFoo()
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{
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if (mName)
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nsCRT::free(mName);
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}
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// Provide a Create method that can be called by a factory constructor:
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NS_METHOD
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nsFoo::Create(nsISupports* aOuter, const nsIID& aIID, void* *aResult)
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{
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if (aOuter)
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return NS_ERROR_NO_AGGREGATION;
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nsFoo* foo = new nsFoo();
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if (foo == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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// Note that Create doesn't initialize the instance -- that has to
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// be done by the caller since the initialization args aren't passed
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// in here.
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// AddRef before calling QI -- this makes it easier to handle the QI
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// failure case because we'll always just Release and return
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NS_ADDREF(foo);
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nsresult rv = foo->QueryInterface(aIID, aResult);
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// This will free it if QI failed:
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NS_RELEASE(foo);
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return rv;
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}
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// Implement the nsISupports methods:
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NS_IMPL_ISUPPORTS(nsFoo, nsIFoo::GetIID());
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// Implement the method(s) of the interface:
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NS_IMETHODIMP
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nsFoo::Doit(int x)
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{
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printf("%s %d\n", mName, x);
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return NS_OK;
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}
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// Finally, (if you really need one) implement a global constructor function
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// for this class:
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PR_IMPLEMENT(nsresult)
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NS_NewFoo(nsIFoo* *result, const char* name)
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{
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// Use the constructor method to create this. Don't duplicate work.
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nsresult rv = nsFoo::Create(NULL, nsIFoo::GetIID(),
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(void**)result);
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if (NS_SUCCEEDED(rv)) {
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// Only initialize if the constructor succeeded:
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rv = (*result)->Init(name);
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}
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return rv;
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}
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////////////////////////////////////////////////////////////////////////////////
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// nsFooModuleFactory.cpp
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////////////////////////////////////////////////////////////////////////////////
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// This file defines the factory that instantiates nsFoo and any other classes
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// in the same component. It also defines the component's NSGetFactory,
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// NSRegisterSelf and NSUnregisterSelf entry points:
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// Include nsFoo.h to get the nsFoo::Create method:
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//#include "nsFoo.h"
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#include "nsIComponentManager.h"
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#include "nsIServiceManager.h"
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// Include the generic factory stuff. It's the easiest and smallest way to
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// work with factories:
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#include "nsGenericFactory.h"
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static NS_DEFINE_CID(kFooCID, NS_FOO_CID);
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static NS_DEFINE_CID(kComponentManagerCID, NS_COMPONENTMANAGER_CID);
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extern "C" PR_IMPLEMENT(nsresult)
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NSGetFactory(nsISupports* aServMgr,
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const nsCID &aClass,
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const char *aClassName,
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const char *aProgID,
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nsIFactory **aFactory)
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{
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nsresult rv;
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nsIGenericFactory* fact;
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if (aClass.Equals(kFooCID))
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rv = NS_NewGenericFactory(&fact, nsFoo::Create);
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else
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rv = NS_ERROR_FAILURE;
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if (NS_SUCCEEDED(rv))
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*aFactory = fact;
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return rv;
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}
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extern "C" PR_IMPLEMENT(nsresult)
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NSRegisterSelf(nsISupports* aServMgr , const char* aPath)
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{
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nsresult rv;
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NS_WITH_SERVICE1(nsIComponentManager, compMgr,
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aServMgr, kComponentManagerCID, &rv);
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if (NS_FAILED(rv)) return rv;
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rv = compMgr->RegisterComponent(kFooCID, "Foo", NULL,
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aPath, PR_TRUE, PR_TRUE);
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return rv;
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}
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extern "C" PR_IMPLEMENT(nsresult)
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NSUnregisterSelf(nsISupports* aServMgr, const char* aPath)
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{
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nsresult rv;
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NS_WITH_SERVICE1(nsIComponentManager, compMgr,
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aServMgr, kComponentManagerCID, &rv);
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if (NS_FAILED(rv)) return rv;
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rv = compMgr->UnregisterComponent(kFooCID, aPath);
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return rv;
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}
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////////////////////////////////////////////////////////////////////////////////
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