Creates an element on the given document. : DOM Document « XML « Java

Creates an element on the given document.

 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2010 Luis Goncalves.
 * XAdES4j is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or any later version.
 * XAdES4j is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * You should have received a copy of the GNU Lesser General Public License along
 * with XAdES4j. If not, see <>.
//package xades4j.utils;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

 * Utility methods for DOM nodes.
 * @author Lus
public class DOMHelper {
   * Creates an element on the given document. Exceptions are as in
   * {@link Document#createElementNS(java.lang.String, java.lang.String)}. The
   * qualified name is obtained by {@code prefix}:{@code name} if the prefix
   * is not {@code null}.
   * @param doc
   *            the owner document
   * @param name
   *            the element's local name
   * @param prefix
   *            the element's prefix (may be {@code null})
   * @param namespaceURI
   *            the element's uri ({@code null} for no namespace)
   * @return the created element
   * @see Document#createElementNS(java.lang.String, java.lang.String)
  public static Element createElement(Document doc, String name,
      String prefix, String namespaceURI) {
    if (prefix != null)
      name = prefix + ":" + name;
    return doc.createElementNS(namespaceURI, name);

  public static Element createElementInTempDocument(String name,
      String prefix, String namespaceURI) {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try {
      Document doc = dbf.newDocumentBuilder().newDocument();
      return createElement(doc, name, prefix, namespaceURI);
    } catch (ParserConfigurationException ex) {
      return null;



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