org.apache.myfaces.shared_tomahawk.util.xml.XmlUtils Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.myfaces.shared_tomahawk.util.xml;

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

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author Manfred Geiler (latest modification by $Author: lu4242 $)
 * @version $Revision: 1239799 $ $Date: 2012-02-02 15:00:42 -0500 (Thu, 02 Feb 2012) $
 */
public class XmlUtils
{
    private XmlUtils()
    {
        // hide from public access
    }

    public static String getElementText(Element elem)
    {
        StringBuilder buf = new StringBuilder();
        NodeList nodeList = elem.getChildNodes();
        for (int i = 0, len = nodeList.getLength(); i < len; i++)
        {
            Node n = nodeList.item(i);
            if (n.getNodeType() == Node.TEXT_NODE)
            {
                buf.append(n.getNodeValue());
            }
            else
            {
                //TODO see jsf-samples
                //throw new FacesException("Unexpected node type " + n.getNodeType());
            }
        }
        return buf.toString();
    }



    /**
     * Return content of child element with given tag name.
     * If more than one children with this name are present, the content of the last
     * element is returned.
     *
     * @param elem
     * @param childTagName
     * @return content of child element or null if no child element with this name was found
     */
    public static String getChildText(Element elem, String childTagName)
    {
        NodeList nodeList = elem.getElementsByTagName(childTagName);
        int len = nodeList.getLength();
        if (len == 0)
        {
            return null;
        }

        return getElementText((Element)nodeList.item(len - 1));
        
   }


    /**
     * Return list of content Strings of all child elements with given tag name.
     * @param elem
     * @param childTagName
     * @return List 
     */
    public static List getChildTextList(Element elem, String childTagName)
    {
        NodeList nodeList = elem.getElementsByTagName(childTagName);
        int len = nodeList.getLength();
        if (len == 0)
        {
            return Collections.EMPTY_LIST;
        }

        List list = new ArrayList(len);
        for (int i = 0; i < len; i++)
        {
            list.add(getElementText((Element)nodeList.item(i)));
        }
        return list;
        
   }

}