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/* -*- Mode: C++; tab-width: 2; 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of 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"
#include "nsIProperties.idl"
#include "nsISimpleEnumerator.idl"

interface nsIInputStream;
interface nsIOutputStream;

[scriptable, uuid(283EE646-1AEF-11D4-98B3-00C04fA0CE9A)]
interface nsIPropertyElement : nsISupports {
  attribute AUTF8String key;
  attribute AString value;
};

[scriptable, uuid(1A180F60-93B2-11d2-9B8B-00805F8A16D9)]
interface nsIPersistentProperties : nsIProperties
{
  /**
   * load a set of name/value pairs from the input stream
   * names and values should be in UTF8
   */
  void load(in nsIInputStream input);

  /**
   * output the values to the stream - results will be in UTF8
   */
  void save(in nsIOutputStream output, in AUTF8String header);

  /**
   * call subclass() to make future calls to load() set the properties
   * in this "superclass" instead
   */
  void subclass(in nsIPersistentProperties superclass);

  /**
   * get an enumeration of nsIPropertyElement objects,
   * which are read-only (i.e. setting properties on the element will
   * not make changes back into the source nsIPersistentProperties
   */
  nsISimpleEnumerator enumerate();

  /**
   * shortcut to nsIProperty's get() which retrieves a string value
   * directly (and thus faster)
   */
  AString getStringProperty(in AUTF8String key);

  /**
   * shortcut to nsIProperty's set() which sets a string value
   * directly (and thus faster). If the given property already exists,
   * then the old value will be returned
   */
  AString setStringProperty(in AUTF8String key, in AString value);
};


%{C++

#define NS_IPERSISTENTPROPERTIES_CID \
{ 0x2245e573, 0x9464, 0x11d2, \
  { 0x9b, 0x8b, 0x0, 0x80, 0x5f, 0x8a, 0x16, 0xd9 } }

#define NS_PERSISTENTPROPERTIES_CONTRACTID "@mozilla.org/persistent-properties;1"
#define NS_PERSISTENTPROPERTIES_CLASSNAME "Persistent Properties"

%}