Java XPath Expression xmlValueOf(Node node, String xpathExpression)

Description

Returns the textual representation after evaluating the xpathExpression.

License

Open Source License

Declaration

public static String xmlValueOf(Node node, String xpathExpression) 

Method Source Code

//package com.java2s;
/*//from  w w  w . j ava  2s .  c o  m
 *   SoftSqueeze Copyright (c) 2004 Richard Titmuss
 *
 *   This file is part of SoftSqueeze.
 *
 *   SoftSqueeze is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   SoftSqueeze 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 the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with SoftSqueeze; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main {
    /**
     * Returns the textual representation after evaluating the xpathExpression.
     */
    public static String xmlValueOf(Node node, String xpathExpression) {
        List nodes = xmlSelectNodes(node, xpathExpression);
        StringBuffer buf = new StringBuffer();
        for (Iterator i = nodes.iterator(); i.hasNext();) {
            Node n = (Node) i.next();
            String str = xmlGetText(n);
            if (str != null)
                buf.append(str);
        }
        return buf.toString();
    }

    /**
     * Oh, for a decent xml library ;). This method returns a list of nodes
     * matching very simple xml xpath expressions.
     */
    public static List xmlSelectNodes(Node node, String xpathExpression) {
        List list = new LinkedList();

        String path[] = split(xpathExpression, "/");
        xmlSelectNodes0(list, node, path, 0);

        return list;
    }

    /**
     * Returns the text of the node.
     */
    public static String xmlGetText(Node node) {
        NodeList kids = node.getChildNodes();
        for (int i = 0; i < kids.getLength(); i++) {
            Node kid = kids.item(i);

            if (kid.getNodeName().equals("#text"))
                return kid.getNodeValue();
            else if (kid.getNodeName().equals("#cdata-section"))
                return kid.getNodeValue();
        }
        return null;
    }

    /**
     * Splits a string using the given delimiters. Returns an array of strings.
     * This is equivalent to String.split("\s*[delim]\s*") in jdk1.4.
     */
    public static String[] split(String str, String delim) {
        StringTokenizer tok = new StringTokenizer(str, delim);

        int n = tok.countTokens();
        String split[] = new String[n];

        for (int i = 0; tok.hasMoreTokens(); i++)
            split[i] = tok.nextToken().trim();

        return split;
    }

    private static void xmlSelectNodes0(List list, Node node, String path[], int n) {
        if (n == path.length) {
            list.add(node);
            return;
        }

        if (path[n].equals("..")) {
            xmlSelectNodes0(list, node.getParentNode(), path, n + 1);
            return;
        }

        NodeList kids = node.getChildNodes();
        for (int i = 0; i < kids.getLength(); i++) {
            Node kid = kids.item(i);

            if (kid.getNodeName().equals(path[n]))
                xmlSelectNodes0(list, kid, path, n + 1);
        }
    }
}

Related

1. singleXPathNode(String expression, Node node)
2. streamNodes(String xpath, Object node)
3. string(Node context, String expression)
4. string(String fileName, String xpathExpression)
5. valueOf(Node node, String xpath, NamespaceContext context)
6. xPathStr(String expr, Object context)
7. xpathToNode(String xpathQuery, Object domObject)
8. XPathValueFromString(String sIn, String sxpath)