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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file and, per its terms, should not be removed:
*
* Copyright (c) 2002 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.xpath;
import org.w3c.dom.Node;
import org.w3c.dom.DOMException;
/**
* The evaluation of XPath expressions is provided by
* <code>XPathEvaluator</code>. In a DOM implementation which supports the
* XPath 3.0 feature, as described above, the <code>XPathEvaluator</code>
* interface will be implemented on the same object which implements the
* <code>Document</code> interface permitting it to be obtained by the usual
* binding-specific method such as casting or by using the DOM Level 3
* getInterface method. In this case the implementation obtained from the
* Document supports the XPath DOM module and is compatible with the XPath
* 1.0 specification.
* <p>Evaluation of expressions with specialized extension functions or
* variables may not work in all implementations and is, therefore, not
* portable. <code>XPathEvaluator</code> implementations may be available
* from other sources that could provide specific support for specialized
* extension functions or variables as would be defined by other
* specifications.
* <p>See also the <a href='http://www.w3.org/2002/08/WD-DOM-Level-3-XPath-20020820'>Document Object Model (DOM) Level 3 XPath Specification</a>.
*/
public interface XPathEvaluator {
/**
* Creates a parsed XPath expression with resolved namespaces. This is
* useful when an expression will be reused in an application since it
* makes it possible to compile the expression string into a more
* efficient internal form and preresolve all namespace prefixes which
* occur within the expression.
* @param expression The XPath expression string to be parsed.
* @param resolver The <code>resolver</code> permits translation of
* prefixes within the XPath expression into appropriate namespace URIs
* . If this is specified as <code>null</code>, any namespace prefix
* within the expression will result in <code>DOMException</code>
* being thrown with the code <code>NAMESPACE_ERR</code>.
* @return The compiled form of the XPath expression.
* @exception XPathException
* INVALID_EXPRESSION_ERR: Raised if the expression is not legal
* according to the rules of the <code>XPathEvaluator</code>i
* @exception DOMException
* NAMESPACE_ERR: Raised if the expression contains namespace prefixes
* which cannot be resolved by the specified
* <code>XPathNSResolver</code>.
*/
public XPathExpression createExpression(String expression,
XPathNSResolver resolver)
throws XPathException, DOMException;
/**
* Adapts any DOM node to resolve namespaces so that an XPath expression
* can be easily evaluated relative to the context of the node where it
* appeared within the document. This adapter works like the DOM Level 3
* method <code>lookupNamespaceURI</code> on nodes in resolving the
* namespaceURI from a given prefix using the current information
* available in the node's hierarchy at the time lookupNamespaceURI is
* called. also correctly resolving the implicit xml prefix.
* @param nodeResolver The node to be used as a context for namespace
* resolution.
* @return <code>XPathNSResolver</code> which resolves namespaces with
* respect to the definitions in scope for a specified node.
*/
public XPathNSResolver createNSResolver(Node nodeResolver);
/**
* Evaluates an XPath expression string and returns a result of the
* specified type if possible.
* @param expression The XPath expression string to be parsed and
* evaluated.
* @param contextNode The <code>context</code> is context node for the
* evaluation of this XPath expression. If the XPathEvaluator was
* obtained by casting the <code>Document</code> then this must be
* owned by the same document and must be a <code>Document</code>,
* <code>Element</code>, <code>Attribute</code>, <code>Text</code>,
* <code>CDATASection</code>, <code>Comment</code>,
* <code>ProcessingInstruction</code>, or <code>XPathNamespace</code>
* node. If the context node is a <code>Text</code> or a
* <code>CDATASection</code>, then the context is interpreted as the
* whole logical text node as seen by XPath, unless the node is empty
* in which case it may not serve as the XPath context.
* @param resolver The <code>resolver</code> permits translation of
* prefixes within the XPath expression into appropriate namespace URIs
* . If this is specified as <code>null</code>, any namespace prefix
* within the expression will result in <code>DOMException</code>
* being thrown with the code <code>NAMESPACE_ERR</code>.
* @param type If a specific <code>type</code> is specified, then the
* result will be returned as the corresponding type.For XPath 1.0
* results, this must be one of the codes of the
* <code>XPathResult</code> interface.
* @param result The <code>result</code> specifies a specific result
* object which may be reused and returned by this method. If this is
* specified as <code>null</code>or the implementation does not reuse
* the specified result, a new result object will be constructed and
* returned.For XPath 1.0 results, this object will be of type
* <code>XPathResult</code>.
* @return The result of the evaluation of the XPath expression.For XPath
* 1.0 results, this object will be of type <code>XPathResult</code>.
* @exception XPathException
* INVALID_EXPRESSION_ERR: Raised if the expression is not legal
* according to the rules of the <code>XPathEvaluator</code>i
* <br>TYPE_ERR: Raised if the result cannot be converted to return the
* specified type.
* @exception DOMException
* NAMESPACE_ERR: Raised if the expression contains namespace prefixes
* which cannot be resolved by the specified
* <code>XPathNSResolver</code>.
* <br>WRONG_DOCUMENT_ERR: The Node is from a document that is not
* supported by this <code>XPathEvaluator</code>.
* <br>NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath
* context node or the request type is not permitted by this
* <code>XPathEvaluator</code>.
*/
public Object evaluate(String expression,
Node contextNode,
XPathNSResolver resolver,
short type,
Object result)
throws XPathException, DOMException;
}