/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is ActiveState Tool Corp.
 * Portions created by ActiveState are Copyright (C) 2001 ActiveState
 * Tool Corporation. All Rights Reserved.
 *
 * Contributor(s): Mark Hammond <MarkH@ActiveState.com>
 */

#include "nsISupports.idl"
#include "nsIException.idl"

// An exception provider.  These can turn special nsresult codes
// into nsIExceptions

[scriptable, uuid(0577744c-c1d2-47f2-8bcc-ce7a9e5a88fc)]
interface nsIExceptionProvider : nsISupports
{
    /** Gets an nsIException or returns NULL if not possible. **/
    nsIException getException(in nsresult result);
};

// A ScriptErrorManager for a single thread.  These objects
// are _not_ thread-safe.  Use the ScriptErrorService
// to get a script error manager for your current thread.
[scriptable, uuid(efc9d00b-231c-4feb-852c-ac017266a415)]
interface nsIExceptionManager : nsISupports
{
    /** Sets (or clears with nsnull) the current error on the this thread. */
    void setCurrentException( in nsIException error);

    /** Gets the current error for the current thread, or NULL if no error */
     nsIException getCurrentException();

    /** Gets an exception from a registered exception provider..
        This has no effect on the "current exception" */
    nsIException getExceptionFromProvider( in nsresult rc );
};


// The Exception Service.  Allows you to get an set exceptions in a thread
// safe manner, or to get an ExceptionManager for your specific thread.
[scriptable, uuid(35A88F54-F267-4414-92A7-191F6454AB52)]
interface nsIExceptionService : nsIExceptionManager
{
    /** Obtains an exception manager for the current thread. */
    readonly attribute nsIExceptionManager currentExceptionManager;

    /** Installs an "exception provider" which is capable of
        translating an nsresult into an exception.  This enables
        error providers to return simple nsresults and only provide
        rich errors when specifically requested. It also has the
        advantage of allowing code like the DOM to handle all errors
        in a single function rather than at each XPCOM entry point.
        NOTE: This interface must be thread-safe - it will be called
        on whatever thread needs the error translation performed.*/
    void registerExceptionProvider( in nsIExceptionProvider provider, in PRUint32 moduleCode );
    void unregisterExceptionProvider( in nsIExceptionProvider provider, in PRUint32 moduleCode );
};


%{ C++
#define NS_EXCEPTIONSERVICE_CLASSNAME "Exception Service"
// {35A88F54-F267-4414-92A7-191F6454AB52}
#define NS_EXCEPTIONSERVICE_CID \
{ 0x35a88f54, 0xf267, 0x4414, { 0x92, 0xa7, 0x19, 0x1f, 0x64, 0x54, 0xab, 0x52 } }
#define NS_EXCEPTIONSERVICE_CONTRACTID "@mozilla.org/exceptionservice;1"
%}
