xpcom/ds/nsISimpleEnumerator.idl
author Ehsan Akhgari <ehsan@mozilla.com>
Thu, 03 Feb 2011 01:31:14 -0500
changeset 61845 108aec53a28051831834d4f909e1336046c57dcb
parent 47159 84c1694a4ca9af3a0fd5605a7ec0e9b9e7bd0129
child 94475 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Bug 630564 - Ctrl+Shift+X in the location bar in RTL mode should change the text alignment in addition to directionality; r=roc a=blocking-final+

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#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
 */

[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();
};