/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
* 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.
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_FAILURE 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), or NS_ERROR_OUT_OF_MEMORY if out of memory.