/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla 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/MPL/
 *
 * 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 the Web Content Converter Registrar.
 *
 * The Initial Developer of the Original Code is Google Inc.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Ben Goodger <beng@google.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIRequest;

[scriptable, uuid(2bd97d63-e928-4d52-9fd4-34061349a9a6)]
interface nsIWebContentHandlerInfo : nsISupports
{
  /**
   * The content type handled by the handler
   */
  readonly attribute AString contentType;

  /**
   * The uri of the handler, with an embedded %s where the URI of the loaded
   * document will be encoded.
   */
  readonly attribute AString uri;

  /**
   * A human readable title of the handler.
   */
  readonly attribute AString name;

  /** 
   * Gets the service URL Spec, with the loading document URI encoded in it.
   * @param   uri
   *          The URI of the document being loaded
   * @returns The URI of the service with the loading document URI encoded in 
   *          it.
   */
  AString getHandlerURI(in AString uri);

  /**
   * Determines if this handler object is equivalent to another.
   * @param   other
   *          The other handler info object
   * @returns true if the two objects are equivalent (same content type, 
   *          same uri).
   */
  boolean equals(in nsIWebContentHandlerInfo other);
};

[scriptable, uuid(632b16a8-5c6b-4dc5-a8db-01771af7a79d)]
interface nsIWebContentConverterService : nsISupports
{
  /**
   * Specifies the handler to be used to automatically handle all links of a
   * certain content type from now on. 
   * @param   contentType
   *          The content type to automatically load with the specified handler
   * @param   handler
   *          A web service handler. If this is null, no automatic action is
   *          performed and the user must choose.
   * @throws  NS_ERROR_NOT_AVAILABLE if the service refered to by |handler| is 
   *          not already registered.
   */
  void setAutoHandler(in AString contentType, in nsIWebContentHandlerInfo handler);

  /**
   * Gets the auto handler specified for a particular content type
   * @param   contentType
   *          The content type to look up an auto handler for.
   * @returns The web service handler that will automatically handle all 
   *          documents of the specified type. null if there is no automatic
   *          handler. (Handlers may be registered, just none of them specified
   *          as "automatic").
   */
  nsIWebContentHandlerInfo getAutoHandler(in AString contentType);

  /**
   * Gets a web handler for the specified service URI
   * @param   contentType
   *          The content type of the service being located
   * @param   uri
   *          The service URI of the handler to locate.
   * @returns A web service handler that uses the specified uri.
   */
  nsIWebContentHandlerInfo getWebContentHandlerByURI(in AString contentType, 
                                                     in AString uri);

  /**
   * Loads the preferred handler when content of a registered type is about
   * to be loaded.
   * @param   request
   *          The nsIRequest for the load of the content
   */
  void loadPreferredHandler(in nsIRequest request);

  /**
   * Removes a registered protocol handler
   * @param   protocol
   *          The protocol scheme to remove a service handler for
   * @param   uri
   *          The uri of the service handler to remove
   */
  void removeProtocolHandler(in AString protocol, in AString uri);

  /**
   * Removes a registered content handler
   * @param   contentType
   *          The content type to remove a service handler for
   * @param   uri
   *          The uri of the service handler to remove
   */
  void removeContentHandler(in AString contentType, in AString uri);

  /**
   * Registers a protocol handler for a web service
   * @param   protocol
   *          The protocol scheme to register a service handler for
   * @param   uri
   *          The uri of the service handler to register
   * @param   title
   *          The human readable title of the service
   */
  void registerProtocolHandler(in AString scheme, in AString uri, 
                               in AString title);

  /**
   * Registers a content handler for a web service
   * @param   contentType
   *          The content type to register a service handler for
   * @param   uri
   *          The uri of the service handler to register
   * @param   title
   *          The human readable title of the service
   */
  void registerContentHandler(in AString contentType, in AString uri,
                              in AString title);

  /**
   * Gets the list of content handlers for a particular type.
   * @param   contentType
   *          The content type to get handlers for
   * @returns An array of nsIWebContentHandlerInfo objects
   */
  void getContentHandlers(in AString contentType, out unsigned long count,
                          [retval,array,size_is(count)] out nsIWebContentHandlerInfo handlers);

  /**
   * Resets the list of available content handlers to the default set from
   * the distribution.
   * @param   contentType
   *          The content type to reset handlers for
   */
  void resetHandlersForType(in AString contentType);
};

