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 * However, the following notice accompanied the original version of this
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package org.w3c.dom.xpath;


import org.w3c.dom.Node;
import org.w3c.dom.DOMException;


The XPathExpression interface represents a parsed and resolved
XPath expression.

See also the Document Object Model (DOM) Level 3 XPath Specification.

/**
 * The <code>XPathExpression</code> interface represents a parsed and resolved
 * XPath expression.
 * <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 XPathExpression {
    
Evaluates this XPath expression and returns a result.

Params:
  • contextNode – The context is context node for the
  evaluation of this XPath expression.If the XPathEvaluator was
  obtained by casting the Document then this must be
  owned by the same document and must be a Document,
  Element, Attribute, Text,
  CDATASection, Comment,
  ProcessingInstruction, or XPathNamespace
  node.If the context node is a Text or a
  CDATASection, 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.
  • type – If a specific type is specified, then the
  result will be coerced to return the specified type relying on
  XPath conversions and fail if the desired coercion is not possible.
  This must be one of the type codes of XPathResult.
  • result – The result specifies a specific result
  object which may be reused and returned by this method. If this is
  specified as nullor 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
  XPathResult.
Throws:
  • XPathException – 
  TYPE_ERR: Raised if the result cannot be converted to return the
  specified type.
  • DOMException – 
  WRONG_DOCUMENT_ERR: The Node is from a document that is not supported
  by the XPathEvaluator that created this XPathExpression
  .
  
    NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath
  context node or the request type is not permitted by this
  XPathExpression.
Returns:The result of the evaluation of the XPath expression.For XPath
  1.0 results, this object will be of type XPathResult.
/**
     * Evaluates this XPath expression and returns a result.
     * @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 type If a specific <code>type</code> is specified, then the
     *   result will be coerced to return the specified type relying on
     *   XPath conversions and fail if the desired coercion is not possible.
     *   This must be one of the type codes of <code>XPathResult</code>.
     * @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
     *   TYPE_ERR: Raised if the result cannot be converted to return the
     *   specified type.
     * @exception DOMException
     *   WRONG_DOCUMENT_ERR: The Node is from a document that is not supported
     *   by the XPathEvaluator that created this <code>XPathExpression</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>XPathExpression</code>.
     */
    public Object evaluate(Node contextNode,
                           short type,
                           Object result)
                           throws XPathException, DOMException;

}