gecko-dev/xpcom/ds/nsISimpleEnumerator.idl
dougt%netscape.com 1350d3f0cc not part of build
2001-10-30 02:11:57 +00:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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*
* Software distributed under the License is distributed on an "AS IS" basis,
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* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
* 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
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* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
/**
* Used to enumerate over elements defined by its implementor.
* Although hasMoreElements() can be called independently of getNext(),
* getNext() must be pre-ceeded by a call to hasMoreElements(). There is
* no way to "reset" an enumerator, once you obtain one.
*
* @status FROZEN
* @version 1.0
*/
[scriptable, uuid(D1899240-F9D2-11D2-BDD6-000064657374)]
interface nsISimpleEnumerator : nsISupports {
/**
* Called to determine whether or not the enumerator has
* any elements that can be returned via getNext(). This method
* is generally used to determine whether or not to initiate or
* continue iteration over the enumerator, though it can be
* called without subsequent getNext() calls. Does not affect
* internal state of enumerator.
*
* @see getNext()
* @return PR_TRUE if there are remaining elements in the enumerator.
* PR_FALSE if there are no more elements in the enumerator.
*/
boolean hasMoreElements();
/**
* Called to retrieve the next element in the enumerator. The "next"
* element is the first element upon the first call. Must be
* pre-ceeded by a call to hasMoreElements() which returns PR_TRUE.
* This method is generally called within a loop to iterate over
* the elements in the enumerator.
*
* @see hasMoreElements()
* @return NS_OK if the call succeeded in returning a non-null
* value through the out parameter.
* NS_ERROR_FAILURE if there are no more elements
* to enumerate.
* @return the next element in the enumeration.
*/
nsISupports getNext();
};