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/* 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 nsIVariant;
interface extIPreference;
interface extISessionStorage;


/**
 * Interface that gives simplified access to the console
 */
[scriptable, uuid(ae8482e0-aa5a-11db-abbd-0800200c9a66)]
interface extIConsole : nsISupports
{
  /**
   * Sends a given string to the console.
   * @param   aMsg
   *          The text to send to the console
   */
  void log(in AString aMsg);

  /**
   * Opens the error console window. The console window
   * is focused if already open.
   */
  void open();
};


/**
 * Interface holds information about an event.
 */
[scriptable, function, uuid(05281820-ab62-11db-abbd-0800200c9a66)]
interface extIEventItem : nsISupports
{
  /**
   * The name of the event
   */
  readonly attribute AString type;

  /**
   * Can hold extra details and data associated with the event. This
   * is optional and event specific. If the event does not send extra
   * details, this is null.
   */
  readonly attribute nsIVariant data;

  /**
   * Cancels the event if it is cancelable.
   */
  void preventDefault();
}; 


/**
 * Interface used as a callback for listening to events.
 */
[scriptable, function, uuid(2dfe3a50-ab2f-11db-abbd-0800200c9a66)]
interface extIEventListener : nsISupports
{
  /**
   * This method is called whenever an event occurs of the type for which 
   * the extIEventListener interface was registered.
   *
   * @param   aEvent
   *          The extIEventItem associated with the event.
   */
  void handleEvent(in extIEventItem aEvent);
}; 


/**
 * Interface for supporting custom events.
 */
[scriptable, uuid(3a8ec9d0-ab19-11db-abbd-0800200c9a66)]
interface extIEvents : nsISupports
{
  /**
   * Adds an event listener to the list. If multiple identical event listeners
   * are registered on the same event target with the same parameters the
   * duplicate instances are discarded. They do not cause the EventListener
   * to be called twice and since they are discarded they do not need to be
   * removed with the removeListener method.
   *
   * @param   aEvent
   *          The name of an event
   * @param   aListener
   *          The reference to a listener
   */
  void addListener(in AString aEvent, in extIEventListener aListener);

  /**
   * Removes an event listener from the list. Calling remove
   * with arguments which do not identify any currently registered
   * event listener has no effect.
   * @param   aEvent
   *          The name of an event
   * @param   aListener
   *          The reference to a listener
   */
  void removeListener(in AString aEvent, in extIEventListener aListener);
}; 


/**
 * Interface for simplified access to preferences. The interface has a
 * predefined root preference branch. The root branch is set based on the
 * context of the owner. For example, an extension's preferences have a root
 * of "extensions.<extensionid>.", while the application level preferences
 * have an empty root. All preference "aName" parameters used in this interface
 * are relative to the root branch.
 */
[scriptable, uuid(ce697d40-aa5a-11db-abbd-0800200c9a66)]
interface extIPreferenceBranch : nsISupports
{
  /**
   * The name of the branch root.
   */
  readonly attribute AString root;
  
  /**
   * Array of extIPreference listing all preferences in this branch.
   */
  readonly attribute nsIVariant all;
  
  /**
   * The events object for the preferences
   * supports: "change"
   */
  readonly attribute extIEvents events;
  
  /**
   * Check to see if a preference exists.
   * @param   aName
   *          The name of preference
   * @returns true if the preference exists, false if not
   */
  boolean has(in AString aName);
  
  /**
   * Gets an object representing a preference
   * @param   aName
   *          The name of preference
   * @returns a preference object, or null if the preference does not exist
   */
  extIPreference get(in AString aName);
  
  /**
   * Gets the value of a preference. Returns a default value if
   * the preference does not exist.
   * @param   aName
   *          The name of preference
   * @param   aDefaultValue
   *          The value to return if preference does not exist
   * @returns value of the preference or the given default value if preference
   *          does not exists.
   */
  nsIVariant getValue(in AString aName, in nsIVariant aDefaultValue);

  /**
   * Sets the value of a storage item with the given name.
   * @param   aName
   *          The name of an item
   * @param   aValue
   *          The value to assign to the item
   */
  void setValue(in AString aName, in nsIVariant aValue);

  /**
   * Resets all preferences in a branch back to their default values.
   */
  void reset();
};

/**
 * Interface for accessing a single preference. The data is not cached.
 * All reads access the current state of the preference.
 */
[scriptable, uuid(2C7462E2-72C2-4473-9007-0E6AE71E23CA)]
interface extIPreference : nsISupports
{
  /**
   * The name of the preference.
   */
  readonly attribute AString name;
  
  /**
   * A string representing the type of preference (String, Boolean, or Number).
   */
  readonly attribute AString type;
  
  /**
   * Get/Set the value of the preference.
   */
  attribute nsIVariant value;
  
  /**
   * Get the locked state of the preference. Set to a boolean value to (un)lock it.
   */
  attribute boolean locked;
  
  /**
   * Check if a preference has been modified by the user, or not.
   */
  readonly attribute boolean modified;
  
  /**
   * The preference branch that contains this preference.
   */
  readonly attribute extIPreferenceBranch branch;
  
  /**
   * The events object for this preference.
   * supports: "change"
   */
  readonly attribute extIEvents events;
  
  /**
   * Resets a preference back to its default values.
   */
  void reset();
};


/**
 * Interface representing an extension
 */
[scriptable, uuid(10cee02c-f6e0-4d61-ab27-c16572b18c46)]
interface extIExtension : nsISupports
{
  /**
   * The id of the extension.
   */
  readonly attribute AString id;

  /**
   * The name of the extension.
   */
  readonly attribute AString name;
  
  /**
   * Check if the extension is currently enabled, or not.
   */
  readonly attribute boolean enabled;
  
  /**
   * The version number of the extension.
   */
  readonly attribute AString version;

  /**
   * Indicates whether this is the extension's first run after install
   */
  readonly attribute boolean firstRun;

  /**
   * The preferences object for the extension. Defaults to the
   * "extensions.<extensionid>." branch.
   */
  readonly attribute extIPreferenceBranch prefs;

  /**
   * The storage object for the extension.
   */
  readonly attribute extISessionStorage storage;

  /**
   * The events object for the extension.
   * supports: "uninstall"
   */
  readonly attribute extIEvents events;
}; 

/**
 * Interface representing a list of all installed extensions
 */
[scriptable, uuid(de281930-aa5a-11db-abbd-0800200c9a66)]
interface extIExtensions : nsISupports
{
  /**
   * Array of extIExtension listing all extensions in the application.
   */
  readonly attribute nsIVariant all;

  /**
   * Determines if an extension exists with the given id.
   * @param   aId
   *          The id of an extension
   * @returns true if an extension exists with the given id,
   *          false otherwise.
   */
  boolean has(in AString aId);

  /**
   * Gets a extIExtension object for an extension.
   * @param   aId
   *          The id of an extension
   * @returns An extension object or null if no extension exists
   *          with the given id.
   */
  extIExtension get(in AString aId);
}; 

/**
 * Interface representing a callback that receives an array of extIExtensions
 */
[scriptable, function, uuid(2571cbb5-550d-4400-8038-75df9b553f98)]
interface extIExtensionsCallback : nsISupports
{
  void callback(in nsIVariant extensions);
};

/**
 * Interface representing a simple storage system
 */
[scriptable, uuid(0787ac44-29b9-4889-b97f-13573aec6971)]
interface extISessionStorage : nsISupports
{
  /**
   * The events object for the storage
   * supports: "change"
   */
  readonly attribute extIEvents events;

  /**
   * Determines if a storage item exists with the given name.
   * @param   aName
   *          The name of an item
   * @returns true if an item exists with the given name,
   *          false otherwise.
   */
  boolean has(in AString aName);

  /**
   * Sets the value of a storage item with the given name.
   * @param   aName
   *          The name of an item
   * @param   aValue
   *          The value to assign to the item
   */
  void set(in AString aName, in nsIVariant aValue);

  /**
   * Gets the value of a storage item with the given name. Returns a
   * default value if the item does not exist.
   * @param   aName
   *          The name of an item
   * @param   aDefaultValue
   *          The value to return if no item exists with the given name
   * @returns value of the item or the given default value if no item
   *          exists with the given name.
   */
  nsIVariant get(in AString aName, in nsIVariant aDefaultValue);
}; 

[scriptable, uuid(2be87909-0817-4292-acfa-fc39be53be3f)]
interface extIApplication : nsISupports
{
  /**
   * The id of the application.
   */
  readonly attribute AString id;

  /**
   * The name of the application.
   */
  readonly attribute AString name;
  
  /**
   * The version number of the application.
   */
  readonly attribute AString version;
  
  /**
   * The console object for the application.
   */
  readonly attribute extIConsole console;

  /**
   * The extensions object for the application. Contains a list
   * of all installed extensions.
   */
  void getExtensions(in extIExtensionsCallback aCallback);

  /**
   * The preferences object for the application. Defaults to an empty
   * root branch.
   */
  readonly attribute extIPreferenceBranch prefs;

  /**
   * The storage object for the application.
   */
  readonly attribute extISessionStorage storage;

  /**
   * The events object for the application.
   * supports: "load", "ready", "quit", "unload"
   */
  readonly attribute extIEvents events;

  /**
   * Quits the application (if nobody objects to quit-application-requested).
   * @returns whether quitting will proceed
   */
  boolean quit();

  /**
   * Restarts the application (if nobody objects to quit-application-requested).
   * @returns whether restarting will proceed
   */
  boolean restart();
};