pjs/xpcom/base/nsIInterfaceRequestor.idl

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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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/MPL/
*
* 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 the Mozilla browser.
*
* The Initial Developer of the Original Code is Netscape
* Communications, Inc. Portions created by Netscape are
* Copyright (C) 1999, Mozilla. All Rights Reserved.
*
* Contributor(s):
* Travis Bogard <travis@netscape.com>
*/
#include "nsISupports.idl"
/**
* The nsIInterfaceRequestor interface defines a generic interface for
* requesting objects that a given object might implement. This is very
* similar to QueryInterface found in nsISupports. The main difference being
* that objects returned from this interface are not required to provide a way
* back to the object implementing this interface. The semantics of QI()
* dictate that given an interface A that you QI() on to get to interface B,
* you must be able to QI on B to get back to A. This interface however
* allows you to obtain an interface C from A that may or most likely will not
* have the ability to get back to A.
*/
[scriptable, uuid(033A1470-8B2A-11d3-AF88-00A024FFC08C)]
interface nsIInterfaceRequestor : nsISupports
{
/*
Asks the object for a listener object supporting a particular interface.
This method is used to allow the listener to not adhere to the
QI rules. By providing a a getInterface call the component can have
completely different objects for each distinct type of interface.
*/
void getInterface(in nsIIDRef uuid,
[iid_is(uuid),retval] out nsQIResult result);
};
%{C++
#ifndef nsCOMPtr_h___
#include "nsCOMPtr.h"
#endif
class NS_EXPORT nsGetInterface : public nsCOMPtr_helper
{
public:
nsGetInterface( nsISupports* aSource, nsresult* error )
: mSource(aSource),
mErrorPtr(error)
{
// nothing else to do here
}
virtual nsresult operator()( const nsIID&, void** ) const;
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virtual ~nsGetInterface() {};
private:
nsCOMPtr<nsISupports> mSource;
nsresult* mErrorPtr;
};
inline
const nsGetInterface
do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
{
return nsGetInterface(aSource, error);
}
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%}