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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/. */

#include "nsISupports.idl"

interface nsIURI;

/**
 * nsINestedURI is an interface that must be implemented by any nsIURI
 * implementation which has an "inner" URI that it actually gets data
 * from.
 *
 * For example, if URIs for the scheme "sanitize" have the structure:
 *
 *   sanitize:http://example.com
 *
 * and opening a channel on such a sanitize: URI gets the data from
 * http://example.com, sanitizes it, and returns it, then the sanitize: URI
 * should implement nsINestedURI and return the http://example.com URI as its
 * inner URI.
 */
[scriptable, uuid(6de2c874-796c-46bf-b57f-0d7bd7d6cab0)]
interface nsINestedURI : nsISupports
{
  /**
   * The inner URI for this nested URI.  This must not return null if the
   * getter succeeds; URIs that have no inner must not QI to this interface.
   * Dynamically changing whether there is an inner URI is not allowed.
   *
   * Modifying the returned URI must not in any way modify the nested URI; this
   * means the returned URI must be either immutable or a clone.
   */
  readonly attribute nsIURI innerURI;

  /**
   * The innermost URI for this nested URI.  This must not return null if the
   * getter succeeds.  This is equivalent to repeatedly calling innerURI while
   * the returned URI QIs to nsINestedURI.
   *
   * Modifying the returned URI must not in any way modify the nested URI; this
   * means the returned URI must be either immutable or a clone.   
   */
  readonly attribute nsIURI innermostURI;
};