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/* * 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.Node; /** * Filters are objects that know how to "filter out" nodes. If a * <code>NodeIterator</code> or <code>TreeWalker</code> is given a * <code>NodeFilter</code>, it applies the filter before it returns the next * node. If the filter says to accept the node, the traversal logic returns * it; otherwise, traversal looks for the next node and pretends that the * node that was rejected was not there. * <p>The DOM does not provide any filters. <code>NodeFilter</code> is just an * interface that users can implement to provide their own filters. * <p><code>NodeFilters</code> do not need to know how to traverse from node * to node, nor do they need to know anything about the data structure that * is being traversed. This makes it very easy to write filters, since the * only thing they have to know how to do is evaluate a single node. One * filter may be used with a number of different kinds of traversals, * encouraging code reuse. * <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>. * @since DOM Level 2 */ public interface NodeFilter { // Constants returned by acceptNode /** * Accept the node. Navigation methods defined for * <code>NodeIterator</code> or <code>TreeWalker</code> will return this * node. */ public static final short FILTER_ACCEPT = 1; /** * Reject the node. Navigation methods defined for * <code>NodeIterator</code> or <code>TreeWalker</code> will not return * this node. For <code>TreeWalker</code>, the children of this node * will also be rejected. <code>NodeIterators</code> treat this as a * synonym for <code>FILTER_SKIP</code>. */ public static final short FILTER_REJECT = 2; /** * Skip this single node. Navigation methods defined for * <code>NodeIterator</code> or <code>TreeWalker</code> will not return * this node. For both <code>NodeIterator</code> and * <code>TreeWalker</code>, the children of this node will still be * considered. */ public static final short FILTER_SKIP = 3; // Constants for whatToShow /** * Show all <code>Nodes</code>. */ public static final int SHOW_ALL = 0xFFFFFFFF; /** * Show <code>Element</code> nodes. */ public static final int SHOW_ELEMENT = 0x00000001; /** * Show <code>Attr</code> nodes. This is meaningful only when creating an * <code>NodeIterator</code> or <code>TreeWalker</code> with an * attribute node as its <code>root</code>; in this case, it means that * the attribute node will appear in the first position of the iteration * or traversal. Since attributes are never children of other nodes, * they do not appear when traversing over the document tree. */ public static final int SHOW_ATTRIBUTE = 0x00000002; /** * Show <code>Text</code> nodes. */ public static final int SHOW_TEXT = 0x00000004; /** * Show <code>CDATASection</code> nodes. */ public static final int SHOW_CDATA_SECTION = 0x00000008; /** * Show <code>EntityReference</code> nodes. */ public static final int SHOW_ENTITY_REFERENCE = 0x00000010; /** * Show <code>Entity</code> nodes. This is meaningful only when creating * an <code>NodeIterator</code> or <code>TreeWalker</code> with an * <code>Entity</code> node as its <code>root</code>; in this case, it * means that the <code>Entity</code> node will appear in the first * position of the traversal. Since entities are not part of the * document tree, they do not appear when traversing over the document * tree. */ public static final int SHOW_ENTITY = 0x00000020; /** * Show <code>ProcessingInstruction</code> nodes. */ public static final int SHOW_PROCESSING_INSTRUCTION = 0x00000040; /** * Show <code>Comment</code> nodes. */ public static final int SHOW_COMMENT = 0x00000080; /** * Show <code>Document</code> nodes. */ public static final int SHOW_DOCUMENT = 0x00000100; /** * Show <code>DocumentType</code> nodes. */ public static final int SHOW_DOCUMENT_TYPE = 0x00000200; /** * Show <code>DocumentFragment</code> nodes. */ public static final int SHOW_DOCUMENT_FRAGMENT = 0x00000400; /** * Show <code>Notation</code> nodes. This is meaningful only when creating * an <code>NodeIterator</code> or <code>TreeWalker</code> with a * <code>Notation</code> node as its <code>root</code>; in this case, it * means that the <code>Notation</code> node will appear in the first * position of the traversal. Since notations are not part of the * document tree, they do not appear when traversing over the document * tree. */ public static final int SHOW_NOTATION = 0x00000800; /** * Test whether a specified node is visible in the logical view of a * <code>TreeWalker</code> or <code>NodeIterator</code>. This function * will be called by the implementation of <code>TreeWalker</code> and * <code>NodeIterator</code>; it is not normally called directly from * user code. (Though you could do so if you wanted to use the same * filter to guide your own application logic.) * @param n The node to check to see if it passes the filter or not. * @return A constant to determine whether the node is accepted, * rejected, or skipped, as defined above. */ public short acceptNode(Node n); }