| /* |
| * Copyright (c) 2000 World Wide Web Consortium, |
| * (Massachusetts Institute of Technology, Institut National de |
| * Recherche en Informatique et en Automatique, Keio University). All |
| * Rights Reserved. This program is distributed under the W3C's Software |
| * Intellectual Property License. This program is distributed in the |
| * hope that it will be useful, but WITHOUT ANY WARRANTY; without even |
| * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| * PURPOSE. See W3C License http://www.w3.org/Consortium/Legal/ for more |
| * details. |
| */ |
| |
| package org.w3c.dom.traversal; |
| |
| import org.w3c.dom.DOMException; |
| import org.w3c.dom.Node; |
| |
| /** |
| * NodeIterators are used to step through a set of nodes, e.g. the set of |
| * nodes in a NodeList, the document subtree governed by a particular node, |
| * the results of a query, or any other set of nodes. The set of nodes to be |
| * iterated is determined by the implementation of the NodeIterator. DOM |
| * Level 2 specifies a single NodeIterator implementation for document-order |
| * traversal of a document subtree. Instances of these iterators are created |
| * by calling DocumentTraversal.createNodeIterator(). |
| * @since DOM Level 2 |
| */ |
| public interface NodeIterator { |
| /** |
| * The root node of the Iterator, as specified when it was created. |
| */ |
| public Node getRoot(); |
| |
| /** |
| * This attribute determines which node types are presented via the |
| * iterator. The available set of constants is defined in the |
| * <code>NodeFilter</code> interface. |
| */ |
| public int getWhatToShow(); |
| |
| /** |
| * The filter used to screen nodes. |
| */ |
| public NodeFilter getFilter(); |
| |
| /** |
| * The value of this flag determines whether the children of entity |
| * reference nodes are visible to the iterator. If false, they will be |
| * skipped over. |
| * <br> To produce a view of the document that has entity references |
| * expanded and does not expose the entity reference node itself, use the |
| * whatToShow flags to hide the entity reference node and set |
| * expandEntityReferences to true when creating the iterator. To produce |
| * a view of the document that has entity reference nodes but no entity |
| * expansion, use the whatToShow flags to show the entity reference node |
| * and set expandEntityReferences to false. |
| */ |
| public boolean getExpandEntityReferences(); |
| |
| /** |
| * Returns the next node in the set and advances the position of the |
| * iterator in the set. After a NodeIterator is created, the first call |
| * to nextNode() returns the first node in the set. |
| * @return The next <code>Node</code> in the set being iterated over, or |
| * <code>null</code> if there are no more members in that set. |
| * @exception DOMException |
| * INVALID_STATE_ERR: Raised if this method is called after the |
| * <code>detach</code> method was invoked. |
| */ |
| public Node nextNode() |
| throws DOMException; |
| |
| /** |
| * Returns the previous node in the set and moves the position of the |
| * iterator backwards in the set. |
| * @return The previous <code>Node</code> in the set being iterated over, |
| * or<code>null</code> if there are no more members in that set. |
| * @exception DOMException |
| * INVALID_STATE_ERR: Raised if this method is called after the |
| * <code>detach</code> method was invoked. |
| */ |
| public Node previousNode() |
| throws DOMException; |
| |
| /** |
| * Detaches the iterator from the set which it iterated over, releasing |
| * any computational resources and placing the iterator in the INVALID |
| * state. After<code>detach</code> has been invoked, calls to |
| * <code>nextNode</code> or<code>previousNode</code> will raise the |
| * exception INVALID_STATE_ERR. |
| */ |
| public void detach(); |
| |
| } |
| |