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/* -*- 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/. */
#include "nsIArrayExtensions.idl"
/**
* nsIMutableArray
* 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.
*/
[scriptable, builtinclass, uuid(af059da0-c85b-40ec-af07-ae4bfdc192cc)]
interface nsIMutableArray : nsIArrayExtensions
{
/**
* appendElement()
*
* Append an element at the end of the array.
*
* @param element The element to append.
*/
void appendElement(in nsISupports element);
/**
* removeElementAt()
*
* Remove an element at a specific position, moving all elements
* stored at a higher position down one.
* 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);
/**
* insertElementAt()
*
* Insert an element at the given position, moving the element
* currently located in that position, and all elements in higher
* position, up by one.
*
* @param element The element to insert
* @param index The position in the array:
* If the position is lower than the current length
* of the array, the elements at that position and
* onwards are bumped one position up.
* If the position is equal to the current length
* of the array, the new element is appended.
* An index lower than 0 or higher than the current
* length of the array is invalid and will be ignored.
*/
void insertElementAt(in nsISupports element, in unsigned long index);
/**
* replaceElementAt()
*
* Replace the element at the given position.
*
* @param element The new element to insert
* @param index The position in the array
* If the position is lower than the current length
* of the array, an existing element will be replaced.
* If the position is equal to the current length
* of the array, the new element is appended.
* If the position is higher than the current length
* of the array, empty elements are appended followed
* by the new element at the specified position.
* An index lower than 0 is invalid and will be ignored.
*/
void replaceElementAt(in nsISupports element, in unsigned long index);
/**
* clear()
*
* clear the entire array, releasing all stored objects
*/
void clear();
};