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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
 * 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 Session Restore component.
 *
 * The Initial Developer of the Original Code is
 * Simon B├╝nzli <zeniko@gmail.com>
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dietrich Ayala <dietrich@mozilla.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 nsIDOMWindow;
interface nsIDOMNode;

/**
 * nsISessionStore keeps track of the current browsing state - i.e.
 * tab history, cookies, scroll state, form data, POSTDATA and window features
 * - and allows to restore everything into one window.
 */

[scriptable, uuid(8afb6a83-21e2-40d6-8416-1adfbbbe54cb)]
interface nsISessionStore : nsISupports
{
  /**
   * Initialize the service
   */
  void init(in nsIDOMWindow aWindow);

  /**
   * Get the current browsing state.
   * @return a JSON string representing the session state.
   */
  AString getBrowserState();

  /**
   * Set the browsing state.
   * This will immediately restore the state of the whole application to the state
   * passed in, *replacing* the current session.
   *
   * @param aState is a JSON string representing the session state.
   */
  void setBrowserState(in AString aState);

  /**
   * @param aWindow is the window whose state is to be returned.
   *
   * @return a JSON string representing a session state with only one window.
   */
  AString getWindowState(in nsIDOMWindow aWindow);

  /**
   * @param aWindow    is the window whose state is to be set.
   * @param aState     is a JSON string representing a session state.
   * @param aOverwrite boolean overwrite existing tabs
   */
  void setWindowState(in nsIDOMWindow aWindow, in AString aState, in boolean aOverwrite);

  /**
   * @param aTab is the tab whose state is to be returned.
   *
   * @return a JSON string representing the state of the tab
   *         (note: doesn't contain cookies - if you need them, use getWindowState instead).
   */
  AString getTabState(in nsIDOMNode aTab);

  /**
   * @param aTab   is the tab whose state is to be set.
   * @param aState is a JSON string representing a session state.
   */
  void setTabState(in nsIDOMNode aTab, in AString aState);

  /**
   * Duplicates a given tab as thoroughly as possible.
   *
   * @param aWindow is the window into which the tab will be duplicated.
   * @param aTab    is the tab to duplicate (can be from a different window).
   * @return a reference to the newly created tab.
   */
  nsIDOMNode duplicateTab(in nsIDOMWindow aWindow, in nsIDOMNode aTab);

  /**
   * Get the number of restore-able tabs for a window
   */
  unsigned long getClosedTabCount(in nsIDOMWindow aWindow);

  /**
   * Get closed tab data
   * @return a JSON string representing the list of closed tabs.
   */
  AString getClosedTabData(in nsIDOMWindow aWindow);

  /**
   * @param aWindow
   *          The window to reopen a closed tab in.
   * @param aIndex
   *          Indicates the window to be restored (FIFO ordered).
   * @returns a reference to the reopened tab.
   */
  nsIDOMNode undoCloseTab(in nsIDOMWindow aWindow, in unsigned long aIndex);

  /**
   * @param aWindow is the window to get the value for.
   * @param aKey    is the value's name.
   *
   * @return A string value or "" if none is set.
   */
  AString getWindowValue(in nsIDOMWindow aWindow, in AString aKey);

  /**
   * @param aWindow      is the window to set the value for.
   * @param aKey         is the value's name.
   * @param aStringValue is the value itself (use toSource/eval before setting JS objects).
   */
  void setWindowValue(in nsIDOMWindow aWindow, in AString aKey, in AString aStringValue);

  /**
   * @param aWindow is the window to get the value for.
   * @param aKey    is the value's name.
   */
  void deleteWindowValue(in nsIDOMWindow aWindow, in AString aKey);

  /**
   * @param aTab is the tab to get the value for.
   * @param aKey is the value's name.
   *
   * @return A string value or "" if none is set.
   */
  AString getTabValue(in nsIDOMNode aTab, in AString aKey);

  /**
   * @param aTab         is the tab to set the value for.
   * @param aKey         is the value's name.
   * @param aStringValue is the value itself (use toSource/eval before setting JS objects).
   */
  void setTabValue(in nsIDOMNode aTab, in AString aKey, in AString aStringValue);

  /**
   * @param aTab is the tab to get the value for.
   * @param aKey is the value's name.
   */
  void deleteTabValue(in nsIDOMNode aTab, in AString aKey);

  /**
   * @param aName is the name of the attribute to save/restore for all xul:tabs.
   */
  void persistTabAttribute(in AString aName);

  /**
   * Get the number of restore-able windows
   */
  unsigned long getClosedWindowCount();

  /**
   * Get closed windows data
   *
   * @returns a JSON string representing the list of closed windows.
   */
  AString getClosedWindowData();

  /**
   * @param aIndex is the index of the windows to be restored (FIFO ordered).
   * @returns the nsIDOMWindow object of the reopened window
   */
  nsIDOMWindow undoCloseWindow(in unsigned long aIndex);

  /**
   * Returns true if the last window was closed and should be restored
   *
   * @returns true if the last window was closed and should be restored
   */
  boolean doRestoreLastWindow();
};