org.directwebremoting.util.DomUtil Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.util;

import org.w3c.dom.CharacterData;
import org.w3c.dom.Comment;
import org.w3c.dom.EntityReference;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Various utilities to make up for the fact that DOM isn't as useful as it
 * could be.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DomUtil
{
    /**
     * Extract the textual content from a Node.
     * This is rather like the XPath value of a Node.
     * @param node The node to extract the text from
     * @return The textual value of the node
     */
    public static String getText(Node node)
    {
        StringBuffer reply = new StringBuffer();

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

            if ((child instanceof CharacterData && !(child instanceof Comment)) || child instanceof EntityReference)
            {
                reply.append(child.getNodeValue());
            }
            else if (child.getNodeType() == Node.ELEMENT_NODE)
            {
                reply.append(getText(child));
            }
        }

        return reply.toString();
    }
}