gecko-dev/xpcom/glue/nsIInterfaceRequestorUtils.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"

nsresult
nsGetInterface::operator()(const nsIID& aIID, void** aInstancePtr) const
{
  nsresult status;

  if (mSource) {
    nsCOMPtr<nsIInterfaceRequestor> factoryPtr = do_QueryInterface(mSource);
    if (factoryPtr) {
      status = factoryPtr->GetInterface(aIID, aInstancePtr);
    } else {
      status = NS_ERROR_NO_INTERFACE;
    }
  } else {
    status = NS_ERROR_NULL_POINTER;
  }

  if (NS_FAILED(status)) {
    *aInstancePtr = 0;
  }
  if (mErrorPtr) {
    *mErrorPtr = status;
  }
  return status;
}