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 boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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();
    }
}