/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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
* 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
* The Original Code is XPCOM Array interface.
* The Initial Developer of the Original Code is
* Netscape Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
* Alec Flett <email@example.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 ***** */
* An indexed collection of elements. Provides basic functionality for
* retrieving elements at a specific position, searching for
* elements. Indexes are zero-based, such that the last element in the
* array is stored at the index length-1.
* For an array which can be modified, see nsIMutableArray below.
* Neither interface makes any attempt to protect the individual
* elements from modification. The convention is that the elements of
* the array should not be modified. Documentation within a specific
* interface should describe variations from this convention.
* It is also convention that if an interface provides access to an
* nsIArray, that the array should not be QueryInterfaced to an
* nsIMutableArray for modification. If the interface in question had
* intended the array to be modified, it would have returned an
* null is a valid entry in the array, and as such any nsISupports
* parameters may be null, except where noted.
* @status UNDER_REVIEW
interface nsIArray : nsISupports
* number of elements in the array.
readonly attribute unsigned long length;
* Retrieve a specific element of the array, and QueryInterface it
* to the specified interface. null is a valid result for
* this method, but exceptions are thrown in other circumstances
* @param index position of element
* @param uuid the IID of the requested interface
* @param result the object, QI'd to the requested interface
* @throws NS_ERROR_NO_INTERFACE when an entry exists at the
* specified index, but the requested interface is not
* @throws NS_ERROR_ILLEGAL_VALUE when index > length-1
void queryElementAt(in unsigned long index,
in nsIIDRef uuid,
[iid_is(uuid), retval] out nsQIResult result);
* Get the position of a specific element. Note that since null is
* a valid input, exceptions are used to indicate that an element
* is not found.
* @param startIndex The initial element to search in the array
* To start at the beginning, use 0 as the
* @param element The element you are looking for
* @returns a number >= startIndex which is the position of the
* element in the array.
* @throws NS_ERROR_NOT_FOUND if the element was not in the array.
unsigned long indexOf(in unsigned long startIndex,
in nsISupports element);
* enumerate the array
* @returns a new enumerator positioned at the start of the array
* @throws NS_ERROR_FAILURE if the array is empty (to make it easy
* to detect errors)
* A separate set of methods that will act on the array. Consumers of
* nsIArray should not QueryInterface to nsIMutableArray unless they
* own the array.
* As above, it is legal to add null elements to the array. Note also
* that null elements can be created as a side effect of
* insertElementAt(). Conversely, if insertElementAt() is never used,
* and null elements are never explicitly added to the array, then it
* is guaranteed that queryElementAt() will never return a null value.
* Any of these methods may throw NS_ERROR_OUT_OF_MEMORY when the
* array must grow to complete the call, but the allocation fails.
* @status UNDER_REVIEW
interface nsIMutableArray : nsIArray
* Append an element at the end of the array.
* @param element The element to append.
* @param element Whether or not to store the element using a weak
* @throws NS_ERROR_UNEXPECTED when a weak reference is requested,
* but the element does not support
void appendElement(in nsISupports element, in boolean weak);
* Remove an element at a specific position.
* To remove a specific element, use indexOf() to find the index
* first, then call removeElementAt().
* @param index the position of the item
void removeElementAt(in unsigned long index);
* Insert an element at the given position, and move all elements
* stored at a higher position up one.
* @param element The element to insert
* @param index The position in the array. If the position is
* greater than or equal to the length of the array
* (@see nsIArray) then the array will grow to
* exactly accomadate the index, and the new length
* will be index+1. The newly created entries will
* be null.
* @throws NS_ERROR_FAILURE when a weak reference is requested,
* but the element does not support
void insertElementAt(in nsISupports element, in unsigned long index, in boolean weak);
* clear the entire array, releasing all stored objects