Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 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.Element;

import org.w3c.dom.Node;

public class Main {
    /**
     * Returns the text value of a given child element.
     * 
     * @param parent the Element which contains the child
     * @param childName the (tag) name of the child
     * @return the text value of the child or null if no child exists or the child does not have a text value
     */
    static public String getChildText(Node parent, String childName) {
        Element elem = findFirstChild(parent, childName);
        if (elem == null)
            return null; // not Found!
        return getElementText(elem);
    }

    /**
     * Finds the first (direct) child Element with a given tag name.
     * 
     * @param parent the parent element below which to search the child
     * @param tagName the (tag) name of the desired child element
     * @return the child element if an element of that name existed, or null otherwise
     */
    static public Element findFirstChild(Node parent, String tagName) { // Child Element suchen
        if (parent == null)
            return null;
        Node node = parent.getFirstChild();
        while (node != null) { // Find all Element nodes
            if (node.getNodeType() == Node.ELEMENT_NODE) { // check name
                Element elem = (Element) node;
                if (tagName.equalsIgnoreCase(elem.getTagName()))
                    return elem; // found
            }
            node = node.getNextSibling();
        }
        return null; // not found!
    }

    /**
     * Retrieves the text of a given element.
     * 
     * @param elem the Element for which the text value is requested
     * @return the text value of that element or null if the element has no text value
     */
    static public String getElementText(Node elem) {
        String value = null;
        Node node = (elem != null) ? elem.getFirstChild() : null;
        // Find Text
        while (node != null) { // Find all Text nodes
            if (node.getNodeType() == Node.TEXT_NODE) { // set or append
                if (value == null)
                    value = node.getNodeValue();
                else
                    value += node.getNodeValue();
            }
            node = node.getNextSibling();
        }
        return value;
    }

    /**
     * Gets the first (direct) child Element.
     * 
     * @param parent the parent element below which to search the child
     * @return the first child element, or null otherwise
     */
    static public Element getFirstChild(Node parent) { // Child Element suchen
        if (parent == null)
            return null;
        Node node = parent.getFirstChild();
        while (node != null) { // Find all Element nodes
            if (node.getNodeType() == Node.ELEMENT_NODE)
                return (Element) node; // found
            node = node.getNextSibling();
        }
        return null; // not found!
    }
}