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49 lines
1.9 KiB
Plaintext
49 lines
1.9 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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/**
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* Used to enumerate over elements defined by its implementor.
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* Although hasMoreElements() can be called independently of getNext(),
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* getNext() must be pre-ceeded by a call to hasMoreElements(). There is
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* no way to "reset" an enumerator, once you obtain one.
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*
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* @version 1.0
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*/
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[scriptable, uuid(D1899240-F9D2-11D2-BDD6-000064657374)]
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interface nsISimpleEnumerator : nsISupports {
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/**
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* Called to determine whether or not the enumerator has
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* any elements that can be returned via getNext(). This method
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* is generally used to determine whether or not to initiate or
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* continue iteration over the enumerator, though it can be
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* called without subsequent getNext() calls. Does not affect
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* internal state of enumerator.
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*
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* @see getNext()
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* @return PR_TRUE if there are remaining elements in the enumerator.
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* PR_FALSE if there are no more elements in the enumerator.
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*/
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boolean hasMoreElements();
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/**
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* Called to retrieve the next element in the enumerator. The "next"
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* element is the first element upon the first call. Must be
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* pre-ceeded by a call to hasMoreElements() which returns PR_TRUE.
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* This method is generally called within a loop to iterate over
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* the elements in the enumerator.
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*
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* @see hasMoreElements()
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* @return NS_OK if the call succeeded in returning a non-null
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* value through the out parameter.
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* NS_ERROR_FAILURE if there are no more elements
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* to enumerate.
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* @return the next element in the enumeration.
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*/
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nsISupports getNext();
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};
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