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/* ***** 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
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
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 * 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
 * Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *       Boris Zbarsky <bzbarsky@mit.edu>  (Original Author)
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#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;
};