XPathAPI.java

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 * Licensed to the Apache Software Foundation (ASF) under one
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package com.sun.org.apache.xml.internal.security.utils;

import javax.xml.transform.TransformerException;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * An interface to abstract XPath evaluation
 */
public interface XPathAPI {

    /**
     *  Use an XPath string to select a nodelist.
     *  XPath namespace prefixes are resolved from the namespaceNode.
     *
     *  @param contextNode The node to start searching from.
     *  @param xpathnode
     *  @param str
     *  @param namespaceNode The node from which prefixes in the XPath will be resolved to namespaces.
     *  @return A NodeIterator, should never be null.
     *
     * @throws TransformerException
     */
    NodeList selectNodeList(
        Node contextNode, Node xpathnode, String str, Node namespaceNode
    ) throws TransformerException;

    /**
     * Evaluate an XPath string and return true if the output is to be included or not.
     *  @param contextNode The node to start searching from.
     *  @param xpathnode The XPath node
     *  @param str The XPath expression
     *  @param namespaceNode The node from which prefixes in the XPath will be resolved to namespaces.
     */
    boolean evaluate(Node contextNode, Node xpathnode, String str, Node namespaceNode)
        throws TransformerException;

    /**
     * Clear any context information from this object
     */
    void clear();

}