Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */

import java.util.ArrayList;
import java.util.Iterator;

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

public class Main {
    /**
     * Gets the child of the specified element having the specified unique
     * name.  If there are more than one children elements with the same name
     * and exception is thrown.
     *
     * @param element The parent element
     * @param tagName The name of the desired child
     * @return The named child.
     * @throws Exception Child was not found or was not unique.
     */
    public static Element getUniqueChild(Element element, String tagName) throws Exception {
        final Iterator goodChildren = getChildrenByTagName(element, tagName);

        if (goodChildren != null && goodChildren.hasNext()) {
            final Element child = (Element) goodChildren.next();
            if (goodChildren.hasNext()) {
                throw new Exception("expected only one " + tagName + " tag");
            }
            return child;
        } else {
            throw new Exception("expected one " + tagName + " tag");
        }
    }

    /**
     * Returns an iterator over the children of the given element with
     * the given tag name.
     *
     * @param element The parent element
     * @param tagName The name of the desired child
     * @return An interator of children or null if element is null.
     */
    public static Iterator getChildrenByTagName(Element element, String tagName) {
        if (element == null) {
            return null;
        }
        // getElementsByTagName gives the corresponding elements in the whole
        // descendance. We want only children

        NodeList children = element.getChildNodes();
        ArrayList goodChildren = new ArrayList();
        for (int i = 0; i < children.getLength(); i++) {
            Node currentChild = children.item(i);
            if (currentChild.getNodeType() == Node.ELEMENT_NODE
                    && ((Element) currentChild).getTagName().equals(tagName)) {
                goodChildren.add(currentChild);
            }
        }
        return goodChildren.iterator();
    }
}