001/*
002 * Copyright (c) 2004 World Wide Web Consortium,
003 *
004 * (Massachusetts Institute of Technology, European Research Consortium for
005 * Informatics and Mathematics, Keio University). All Rights Reserved. This
006 * work is distributed under the W3C(r) Software License [1] in the hope that
007 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
008 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
009 *
010 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
011 */
012
013package org.w3c.dom.xpath;
014
015import org.w3c.dom.Node;
016import org.w3c.dom.DOMException;
017
018/**
019 * The <code>XPathExpression</code> interface represents a parsed and resolved 
020 * XPath expression.
021 * <p>See also the <a href='http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>Document Object Model (DOM) Level 3 XPath Specification</a>.
022 */
023public interface XPathExpression {
024    /**
025     * Evaluates this XPath expression and returns a result.
026     * @param contextNode The <code>context</code> is context node for the 
027     *   evaluation of this XPath expression.If the XPathEvaluator was 
028     *   obtained by casting the <code>Document</code> then this must be 
029     *   owned by the same document and must be a <code>Document</code>, 
030     *   <code>Element</code>, <code>Attribute</code>, <code>Text</code>, 
031     *   <code>CDATASection</code>, <code>Comment</code>, 
032     *   <code>ProcessingInstruction</code>, or <code>XPathNamespace</code> 
033     *   node.If the context node is a <code>Text</code> or a 
034     *   <code>CDATASection</code>, then the context is interpreted as the 
035     *   whole logical text node as seen by XPath, unless the node is empty 
036     *   in which case it may not serve as the XPath context.
037     * @param type If a specific <code>type</code> is specified, then the 
038     *   result will be coerced to return the specified type relying on 
039     *   XPath conversions and fail if the desired coercion is not possible. 
040     *   This must be one of the type codes of <code>XPathResult</code>.
041     * @param result The <code>result</code> specifies a specific result 
042     *   object which may be reused and returned by this method. If this is 
043     *   specified as <code>null</code>or the implementation does not reuse 
044     *   the specified result, a new result object will be constructed and 
045     *   returned.For XPath 1.0 results, this object will be of type 
046     *   <code>XPathResult</code>.
047     * @return The result of the evaluation of the XPath expression.For XPath 
048     *   1.0 results, this object will be of type <code>XPathResult</code>.
049     * @exception XPathException
050     *   TYPE_ERR: Raised if the result cannot be converted to return the 
051     *   specified type.
052     * @exception DOMException
053     *   WRONG_DOCUMENT_ERR: The Node is from a document that is not supported 
054     *   by the XPathEvaluator that created this <code>XPathExpression</code>
055     *   .
056     *   <br>NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath 
057     *   context node or the request type is not permitted by this 
058     *   <code>XPathExpression</code>.
059     */
060    public Object evaluate(Node contextNode, 
061                           short type, 
062                           Object result)
063                           throws XPathException, DOMException;
064
065}