/* -*- Mode: C++; tab-width: 2; 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 Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */

/* nsIURIContentListener is an interface used by classes which
   want to know (and have a chance to handle) a particular content type.
   Typical useage scenarios will include running applications which register
   a nsIURIContentListener for each of its content windows with the uri dispatcher
   service. 
*/ 

#include "nsISupports.idl"
#include "nsIURILoader.idl"

interface nsIProtocolHandler;
interface nsIChannel;
interface nsIStreamListener;
interface nsIURI;

[scriptable, uuid(94928AB3-8B63-11d3-989D-001083010E9B)]
interface nsIURIContentListener : nsISupports
{
  /* Give the content listener first crack at forcing us to use
     a specific content handler. Content listener's do not need to 
     support this method if they want the uri dispatcher to find the
     default protocol handler from the registry. 

	 aURI --> the uri we need a protocol handler for
	 aProtocolHandler --> the protocol handler you want the uri loader
	 to use. You can pass back null if you want the uri loader to look
	 up an appropriate protocol handler
   */
   void getProtocolHandler(in nsIURI aURI, out nsIProtocolHandler aProtocolHandler);

  /* The URIDispatcher will give the content listener a shot at handling
     the content before it tries other means. If the content listener
     wants to handle the content then it should return a stream listener
     the data should be pushed into. 
     aContentType --> the content type we need to handle
     aCommand --> verb for the action (this comes from layout???)
     aWindowTarget --> name of the target window if any
     aStreamListener --> the content viewer the content should be displayed in
                        You should return null for this out parameter if you do
                        not want to handle this content type.
	 aAbortProcess --> If you want to handle the content yourself and you don't
					   want the dispatcher to do anything else, return TRUE for
					   this parameter. 
  */

   void doContent(in string aContentType, 
			      in nsURILoadCommand aCommand, 
                  in string aWindowTarget, 
				  in nsIChannel aOpenedChannel,
                  out nsIStreamListener aContentHandler,
				  out boolean aAbortProcess);

   /* returns true if we can handle the content and false if we can't.
      aDesiredContentType --> yes, we can accept aContentType but we would
	  like it converted to aDesiredContentType. This argument can be null if
	  you want the content directly as aContentType */
   boolean canHandleContent(in string aContentType, 
							in nsURILoadCommand aCommand, 
							in string aWindowTarget, 
							out string aDesiredContentType);
};