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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 sts=2
 * 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/. */

#include "nsISupports.idl"

interface nsIURI;

/**
 * This interface can be used to add a download to history.  There is a separate
 * interface specifically for downloads in case embedders choose to track
 * downloads differently from other types of history.
 */
[scriptable, uuid(4dcd6a12-a091-4f38-8360-022929635746)]
interface nsIDownloadHistory : nsISupports {
  /**
   * Adds a download to history.  This will also notify observers that the
   * URI aSource is visited with the topic NS_LINK_VISITED_EVENT_TOPIC if
   * aSource has not yet been visited.
   *
   * @param aSource
   *        The source of the download we are adding to history.  This cannot be
   *        null.
   * @param aReferrer
   *        [optional] The referrer of source URI.
   * @param aStartTime
   *        [optional] The time the download was started.  If the start time
   *        is not given, the current time is used.
   * @param aDestination
   *        [optional] The target where the download is to be saved on the local
   *        filesystem.
   * @throws NS_ERROR_NOT_AVAILABLE
   *         In a situation where a history implementation is not available,
   *         where 'history implementation' refers to something like
   *         nsIGlobalHistory and friends.
   * @note This addition is not guaranteed to be synchronous, since it delegates
   *       the actual addition to the underlying history implementation.  If you
   *       need to observe the completion of the addition, use the underlying
   *       history implementation's notifications system (e.g. nsINavHistoryObserver
   *       for toolkit's implementation of this interface).
   */
  void addDownload(in nsIURI aSource, [optional] in nsIURI aReferrer,
                   [optional] in PRTime aStartTime,
                   [optional] in nsIURI aDestination);

  /**
   * Remove all downloads from history.
   *
   * @note This removal is not guaranteed to be synchronous, since it delegates
   *       the actual removal to the underlying history implementation.  If you
   *       need to observe the completion of the removal, use the underlying
   *       history implementation's notifications system (e.g. nsINavHistoryObserver
   *       for toolkit's implementation of this interface).
   */
  void removeAllDownloads();
};