Java XML Child Element Text getChildText(Element parent, String childLocalName, String childNamespaceURI)

Description

Calls #getText(Element) on the first child element that matches the given local name and namespace.

License

Apache License

Parameter

Parameter	Description
parent	a parameter
childLocalName	a parameter
childNamespaceURI	a parameter

Return

text contained in the first child that matches the given local name and namespace or null.

Declaration

public static String getChildText(Element parent, String childLocalName, String childNamespaceURI)

Method Source Code

//package com.java2s;
/*/* w ww  .  ja  va 2 s.c o  m*/
 * 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.
 */

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

public class Main {
    /**
     * Calls {@link #getText(Element)} on the first child element that matches
     * the given local name and namespace.
     *
     * @param parent
     * @param childLocalName
     * @param childNamespaceURI
     * @return text contained in the first child that matches the given local name
     * and namespace or <code>null</code>.
     * @see #getText(Element)
     */
    public static String getChildText(Element parent, String childLocalName, String childNamespaceURI) {
        Element child = getChildElement(parent, childLocalName, childNamespaceURI);
        return (child == null) ? null : getText(child);
    }

    /**
     * Returns the first child element that matches the given local name and
     * namespace. If no child element is present or no child element matches,
     * <code>null</code> is returned.
     *
     * @param parent
     * @param childLocalName
     * @param childNamespaceURI
     * @return first child element matching the specified names or <code>null</code>.
     */
    public static Element getChildElement(Node parent, String childLocalName, String childNamespaceURI) {
        if (parent != null) {
            NodeList children = parent.getChildNodes();
            for (int i = 0; i < children.getLength(); i++) {
                Node child = children.item(i);
                if (child.getNodeType() == Node.ELEMENT_NODE && childLocalName.equals(child.getLocalName())
                        && childNamespaceURI.equals(child.getNamespaceURI())) {
                    return (Element) child;
                }
            }
        }
        return null;
    }

    /**
     * Concatenates the values of all child nodes of type 'Text' or 'CDATA'/
     *
     * @param element
     * @return String representing the value of all Text and CDATA child nodes or
     * <code>null</code> if the length of the resulting String is 0.
     * @see #isText(org.w3c.dom.Node)
     */
    public static String getText(Element element) {
        StringBuilder content = new StringBuilder();
        if (element != null) {
            NodeList nodes = element.getChildNodes();
            for (int i = 0; i < nodes.getLength(); i++) {
                Node child = nodes.item(i);
                if (isText(child)) {
                    // cast to super class that contains Text and CData
                    content.append(((CharacterData) child).getData());
                }
            }
        }
        return (content.length() == 0) ? null : content.toString();
    }

    /**
     * Same as {@link #getText(Element)} except that 'defaultValue' is returned
     * instead of <code>null</code>, if the element does not contain any text.
     *
     * @param element
     * @param defaultValue
     * @return the text contained in the specified element or
     * <code>defaultValue</code> if the element does not contain any text.
     */
    public static String getText(Element element, String defaultValue) {
        String txt = getText(element);
        return (txt == null) ? defaultValue : txt;
    }

    /**
     * @param node
     * @return true if the given node is of type text or CDATA.
     */
    public static boolean isText(Node node) {
        int ntype = node.getNodeType();
        return ntype == Node.TEXT_NODE || ntype == Node.CDATA_SECTION_NODE;
    }
}