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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#ifndef nsServiceManagerUtils_h__
#define nsServiceManagerUtils_h__

#include "nsIServiceManager.h"
#include "nsCOMPtr.h"

inline
const nsGetServiceByCID
do_GetService(const nsCID& aCID)
{
    return nsGetServiceByCID(aCID);
}

inline
const nsGetServiceByCIDWithError
do_GetService(const nsCID& aCID, nsresult* error)
{
    return nsGetServiceByCIDWithError(aCID, error);
}

inline
const nsGetServiceByContractID
do_GetService(const char* aContractID)
{
    return nsGetServiceByContractID(aContractID);
}

inline
const nsGetServiceByContractIDWithError
do_GetService( const char* aContractID, nsresult* error)
{
    return nsGetServiceByContractIDWithError(aContractID, error);
}

class nsGetServiceFromCategory : public nsCOMPtr_helper
{
 public:
    nsGetServiceFromCategory(const char* aCategory, const char* aEntry,
                             nsresult* aErrorPtr)
        : mCategory(aCategory),
        mEntry(aEntry),
        mErrorPtr(aErrorPtr)
        {
            // nothing else to do
        }
    
    virtual nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
 protected:
    const char*                 mCategory;
    const char*                 mEntry;
    nsresult*                   mErrorPtr;
};

inline
const nsGetServiceFromCategory
do_GetServiceFromCategory( const char* category, const char* entry,
                           nsresult* error = 0)
{
    return nsGetServiceFromCategory(category, entry, error);
}

NS_COM_GLUE nsresult
CallGetService(const nsCID &aClass, const nsIID &aIID, void **aResult);

NS_COM_GLUE nsresult
CallGetService(const char *aContractID, const nsIID &aIID, void **aResult);

// type-safe shortcuts for calling |GetService|
template <class DestinationType>
inline
nsresult
CallGetService( const nsCID &aClass,
                DestinationType** aDestination)
{
    NS_PRECONDITION(aDestination, "null parameter");
    
    return CallGetService(aClass,
                          NS_GET_TEMPLATE_IID(DestinationType),
                          reinterpret_cast<void**>(aDestination));
}

template <class DestinationType>
inline
nsresult
CallGetService( const char *aContractID,
                DestinationType** aDestination)
{
    NS_PRECONDITION(aContractID, "null parameter");
    NS_PRECONDITION(aDestination, "null parameter");
    
    return CallGetService(aContractID,
                          NS_GET_TEMPLATE_IID(DestinationType),
                          reinterpret_cast<void**>(aDestination));
}

#endif