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109 lines
4.8 KiB
Java
109 lines
4.8 KiB
Java
/*
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* Copyright (c) 2000 World Wide Web Consortium,
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* (Massachusetts Institute of Technology, Institut National de
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* Recherche en Informatique et en Automatique, Keio University). All
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* Rights Reserved. This program is distributed under the W3C's Software
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* Intellectual Property License. This program is distributed in the
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* hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE.
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* See W3C License http://www.w3.org/Consortium/Legal/ for more details.
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*/
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package org.w3c.dom.traversal;
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import org.w3c.dom.Node;
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import org.w3c.dom.DOMException;
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/**
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* <code>Iterators</code> are used to step through a set of nodes, e.g. the
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* set of nodes in a <code>NodeList</code>, the document subtree governed by
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* a particular <code>Node</code>, the results of a query, or any other set
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* of nodes. The set of nodes to be iterated is determined by the
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* implementation of the <code>NodeIterator</code>. DOM Level 2 specifies a
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* single <code>NodeIterator</code> implementation for document-order
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* traversal of a document subtree. Instances of these iterators are created
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* by calling <code>DocumentTraversal</code>
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* <code>.createNodeIterator()</code>.
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* <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113'>Document Object Model (DOM) Level 2 Traversal and Range Specification</a>.
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* @since DOM Level 2
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*/
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public interface NodeIterator {
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/**
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* The root node of the <code>NodeIterator</code>, as specified when it
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* was created.
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*/
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public Node getRoot();
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/**
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* This attribute determines which node types are presented via the
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* iterator. The available set of constants is defined in the
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* <code>NodeFilter</code> interface. Nodes not accepted by
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* <code>whatToShow</code> will be skipped, but their children may still
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* be considered. Note that this skip takes precedence over the filter,
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* if any.
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*/
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public int getWhatToShow();
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/**
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* The <code>NodeFilter</code> used to screen nodes.
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*/
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public NodeFilter getFilter();
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/**
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* The value of this flag determines whether the children of entity
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* reference nodes are visible to the iterator. If false, they and
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* their descendants will be rejected. Note that this rejection takes
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* precedence over <code>whatToShow</code> and the filter. Also note
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* that this is currently the only situation where
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* <code>NodeIterators</code> may reject a complete subtree rather than
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* skipping individual nodes.
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* <br>
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* <br> To produce a view of the document that has entity references
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* expanded and does not expose the entity reference node itself, use
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* the <code>whatToShow</code> flags to hide the entity reference node
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* and set <code>expandEntityReferences</code> to true when creating the
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* iterator. To produce a view of the document that has entity reference
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* nodes but no entity expansion, use the <code>whatToShow</code> flags
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* to show the entity reference node and set
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* <code>expandEntityReferences</code> to false.
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*/
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public boolean getExpandEntityReferences();
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/**
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* Returns the next node in the set and advances the position of the
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* iterator in the set. After a <code>NodeIterator</code> is created,
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* the first call to <code>nextNode()</code> returns the first node in
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* the set.
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* @return The next <code>Node</code> in the set being iterated over, or
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* <code>null</code> if there are no more members in that set.
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* @exception DOMException
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* INVALID_STATE_ERR: Raised if this method is called after the
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* <code>detach</code> method was invoked.
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*/
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public Node nextNode()
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throws DOMException;
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/**
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* Returns the previous node in the set and moves the position of the
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* <code>NodeIterator</code> backwards in the set.
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* @return The previous <code>Node</code> in the set being iterated over,
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* or <code>null</code> if there are no more members in that set.
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* @exception DOMException
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* INVALID_STATE_ERR: Raised if this method is called after the
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* <code>detach</code> method was invoked.
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*/
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public Node previousNode()
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throws DOMException;
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/**
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* Detaches the <code>NodeIterator</code> from the set which it iterated
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* over, releasing any computational resources and placing the iterator
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* in the INVALID state. After <code>detach</code> has been invoked,
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* calls to <code>nextNode</code> or <code>previousNode</code> will
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* raise the exception INVALID_STATE_ERR.
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*/
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public void detach();
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}
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