- /*
- * Copyright (c) 2004 World Wide Web Consortium,
- *
- * (Massachusetts Institute of Technology, European Research Consortium for
- * Informatics and Mathematics, Keio University). All Rights Reserved. This
- * work is distributed under the W3C(r) Software License [1] 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.
- *
- * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
- */
-
- package org.w3c.dom.ls;
-
- import org.w3c.dom.Node;
- import org.w3c.dom.Element;
-
- /**
- * <code>LSParserFilter</code>s provide applications the ability to examine
- * nodes as they are being constructed while parsing. As each node is
- * examined, it may be modified or removed, or the entire parse may be
- * terminated early.
- * <p> At the time any of the filter methods are called by the parser, the
- * owner Document and DOMImplementation objects exist and are accessible.
- * The document element is never passed to the <code>LSParserFilter</code>
- * methods, i.e. it is not possible to filter out the document element.
- * <code>Document</code>, <code>DocumentType</code>, <code>Notation</code>,
- * <code>Entity</code>, and <code>Attr</code> nodes are never passed to the
- * <code>acceptNode</code> method on the filter. The child nodes of an
- * <code>EntityReference</code> node are passed to the filter if the
- * parameter "<a href='http://www.w3.org/TR/DOM-Level-3-Core/core.html#parameter-entities'>
- * entities</a>" is set to <code>false</code>. Note that, as described by the parameter "<a href='http://www.w3.org/TR/DOM-Level-3-Core/core.html#parameter-entities'>
- * entities</a>", unexpanded entity reference nodes are never discarded and are always
- * passed to the filter.
- * <p> All validity checking while parsing a document occurs on the source
- * document as it appears on the input stream, not on the DOM document as it
- * is built in memory. With filters, the document in memory may be a subset
- * of the document on the stream, and its validity may have been affected by
- * the filtering.
- * <p> All default attributes must be present on elements when the elements
- * are passed to the filter methods. All other default content must be
- * passed to the filter methods.
- * <p> DOM applications must not raise exceptions in a filter. The effect of
- * throwing exceptions from a filter is DOM implementation dependent.
- * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-LS-20040407'>Document Object Model (DOM) Level 3 Load
- and Save Specification</a>.
- */
- public interface LSParserFilter {
- // Constants returned by startElement and acceptNode
- /**
- * Accept the node.
- */
- public static final short FILTER_ACCEPT = 1;
- /**
- * Reject the node and its children.
- */
- public static final short FILTER_REJECT = 2;
- /**
- * Skip this single node. The children of this node will still be
- * considered.
- */
- public static final short FILTER_SKIP = 3;
- /**
- * Interrupt the normal processing of the document.
- */
- public static final short FILTER_INTERRUPT = 4;
-
- /**
- * The parser will call this method after each <code>Element</code> start
- * tag has been scanned, but before the remainder of the
- * <code>Element</code> is processed. The intent is to allow the
- * element, including any children, to be efficiently skipped. Note that
- * only element nodes are passed to the <code>startElement</code>
- * function.
- * <br>The element node passed to <code>startElement</code> for filtering
- * will include all of the Element's attributes, but none of the
- * children nodes. The Element may not yet be in place in the document
- * being constructed (it may not have a parent node.)
- * <br>A <code>startElement</code> filter function may access or change
- * the attributes for the Element. Changing Namespace declarations will
- * have no effect on namespace resolution by the parser.
- * <br>For efficiency, the Element node passed to the filter may not be
- * the same one as is actually placed in the tree if the node is
- * accepted. And the actual node (node object identity) may be reused
- * during the process of reading in and filtering a document.
- * @param elementArg The newly encountered element. At the time this
- * method is called, the element is incomplete - it will have its
- * attributes, but no children.
- * @return
- * <ul>
- * <li> <code>FILTER_ACCEPT</code> if the <code>Element</code> should
- * be included in the DOM document being built.
- * </li>
- * <li>
- * <code>FILTER_REJECT</code> if the <code>Element</code> and all of
- * its children should be rejected.
- * </li>
- * <li> <code>FILTER_SKIP</code> if the
- * <code>Element</code> should be skipped. All of its children are
- * inserted in place of the skipped <code>Element</code> node.
- * </li>
- * <li>
- * <code>FILTER_INTERRUPT</code> if the filter wants to stop the
- * processing of the document. Interrupting the processing of the
- * document does no longer guarantee that the resulting DOM tree is
- * XML well-formed. The <code>Element</code> is rejected.
- * </li>
- * </ul> Returning
- * any other values will result in unspecified behavior.
- */
- public short startElement(Element elementArg);
-
- /**
- * This method will be called by the parser at the completion of the
- * parsing of each node. The node and all of its descendants will exist
- * and be complete. The parent node will also exist, although it may be
- * incomplete, i.e. it may have additional children that have not yet
- * been parsed. Attribute nodes are never passed to this function.
- * <br>From within this method, the new node may be freely modified -
- * children may be added or removed, text nodes modified, etc. The state
- * of the rest of the document outside this node is not defined, and the
- * affect of any attempt to navigate to, or to modify any other part of
- * the document is undefined.
- * <br>For validating parsers, the checks are made on the original
- * document, before any modification by the filter. No validity checks
- * are made on any document modifications made by the filter.
- * <br>If this new node is rejected, the parser might reuse the new node
- * and any of its descendants.
- * @param nodeArg The newly constructed element. At the time this method
- * is called, the element is complete - it has all of its children
- * (and their children, recursively) and attributes, and is attached
- * as a child to its parent.
- * @return
- * <ul>
- * <li> <code>FILTER_ACCEPT</code> if this <code>Node</code> should
- * be included in the DOM document being built.
- * </li>
- * <li>
- * <code>FILTER_REJECT</code> if the <code>Node</code> and all of its
- * children should be rejected.
- * </li>
- * <li> <code>FILTER_SKIP</code> if the
- * <code>Node</code> should be skipped and the <code>Node</code>
- * should be replaced by all the children of the <code>Node</code>.
- * </li>
- * <li>
- * <code>FILTER_INTERRUPT</code> if the filter wants to stop the
- * processing of the document. Interrupting the processing of the
- * document does no longer guarantee that the resulting DOM tree is
- * XML well-formed. The <code>Node</code> is accepted and will be the
- * last completely parsed node.
- * </li>
- * </ul>
- */
- public short acceptNode(Node nodeArg);
-
- /**
- * Tells the <code>LSParser</code> what types of nodes to show to the
- * method <code>LSParserFilter.acceptNode</code>. If a node is not shown
- * to the filter using this attribute, it is automatically included in
- * the DOM document being built. See <code>NodeFilter</code> for
- * definition of the constants. The constants <code>SHOW_ATTRIBUTE</code>
- * , <code>SHOW_DOCUMENT</code>, <code>SHOW_DOCUMENT_TYPE</code>,
- * <code>SHOW_NOTATION</code>, <code>SHOW_ENTITY</code>, and
- * <code>SHOW_DOCUMENT_FRAGMENT</code> are meaningless here. Those nodes
- * will never be passed to <code>LSParserFilter.acceptNode</code>.
- * <br> The constants used here are defined in [<a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113'>DOM Level 2 Traversal and Range</a>]
- * .
- */
- public int getWhatToShow();
-
- }