/* 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 "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 .
*
* @ version 1 . 0
*/
/**
* A wrapper for an nsISimpleEnumerator instance which implements the
* JavaScript iteration protocol .
*/
[scriptable, uuid(
4432 e8ae-d4d3-
42 a6-a4d1-
829 f1c29512b)]
interface nsIJSEnumerator : nsISupports {
[symbol]
nsIJSEnumerator iterator();
[implicit_jscontext]
jsval next();
};
[scriptable, uuid(
796 f340d-
0 a2a-
490 b-
9 c60-
640765 e99782)]
interface nsISimpleEnumeratorBase : nsISupports {
/**
* Returns a JavaScript iterator for all remaining entries in the enumerator .
* Each entry is typically queried to the appropriate interface for the
* enumerator .
*/
[symbol]
nsIJSEnumerator iterator();
/**
* Returns JavaScript iterator for all remaining entries in the enumerator .
* Each entry is queried only to the supplied interface . If any element
* fails to query to that interface , the error is propagated to the caller .
*/
nsIJSEnumerator entries(in nsIIDRef aIface);
};
[scriptable, uuid(D1899240-F9D2-
11 D2-BDD6-
000064657374 )]
interface nsISimpleEnumerator : nsISimpleEnumeratorBase {
/**
* 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 true if there are remaining elements in the enumerator .
* 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 ( )
* @ throws NS_ERROR_FAILURE if there are no more elements
* to enumerate .
* @ return the next element in the enumeration .
*/
nsISupports getNext();
};
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