sbVariantUtilsLib.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 :miv */
/*
 *=BEGIN SONGBIRD GPL
 *
 * This file is part of the Songbird web player.
 *
 * Copyright(c) 2005-2010 POTI, Inc.
 * http://www.songbirdnest.com
 *
 * This file may be licensed under the terms of of the
 * GNU General Public License Version 2 (the ``GPL'').
 *
 * Software distributed under the License is distributed
 * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
 * express or implied. See the GPL for the specific language
 * governing rights and limitations.
 *
 * You should have received a copy of the GPL along with this
 * program. If not, go to http://www.gnu.org/licenses/gpl.html
 * or write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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 *=END SONGBIRD GPL
 */

#ifndef __SB_VARIANT_UTILS_LIB_H__
#define __SB_VARIANT_UTILS_LIB_H__

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//
// Variant utility defs.
//
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
//
// Variant utility imported services.
//
//------------------------------------------------------------------------------

// Mozilla imports.
#include <nsCOMPtr.h>
#include <nsIVariant.h>


//------------------------------------------------------------------------------
//
// Variant utility inline functions.
//
//------------------------------------------------------------------------------

inline nsQueryInterface
do_VariantQueryInterface(nsIVariant* aVariant)
{
  nsresult rv;

  nsCOMPtr<nsISupports> variantSupports;
  rv = aVariant->GetAsISupports(getter_AddRefs(variantSupports));
  if (NS_FAILED(rv))
    return nsQueryInterface(nsnull);

  return nsQueryInterface(variantSupports);
}


inline nsQueryInterfaceWithError
do_VariantQueryInterface(nsIVariant* aVariant, nsresult* aError)
{
  nsresult rv;

  nsCOMPtr<nsISupports> variantSupports;
  rv = aVariant->GetAsISupports(getter_AddRefs(variantSupports));
  if (NS_FAILED(rv)) {
    *aError = rv;
    return nsQueryInterfaceWithError(nsnull, nsnull);
  }

  return nsQueryInterfaceWithError(variantSupports, aError);
}


//------------------------------------------------------------------------------
//
// Variant utility prototypes.
//
//------------------------------------------------------------------------------

nsresult sbVariantsEqual(nsIVariant* aVariant1,
                         nsIVariant* aVariant2,
                         PRBool*     aEqual);

#endif /* __SB_VARIANT_UTILS_LIB_H__ */