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1   /* This file is part of COPAL (COntext Provisioning for All).
2    *
3    * COPAL is a part of SM4All (Smart hoMes for All) project.
4    *
5    * COPAL is free software: you can redistribute it and/or modify
6    * it under the terms of the GNU Lesser General Public License as published by
7    * the Free Software Foundation, either version 3 of the License, or
8    * (at your option) any later version.
9    *
10   * COPAL is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   * GNU Lesser General Public License for more details.
14   *
15   * You should have received a copy of the GNU Lesser General Public License
16   * along with COPAL. If not, see <http://www.gnu.org/licenses/>.
17   */
18  package at.ac.tuwien.infosys.sm4all.copal.api.xml;
19  
20  import org.w3c.dom.Element;
21  
22  /**
23   * Strategy class for appending one {@link Element} into another {@link Element}
24   * i.e. adding an {@link Element} as last child of another {@link Element}.
25   * 
26   * @author sanjin
27   */
28  public class Append implements AddStrategy {
29  
30      /**
31       * Appends specified child {@link Element} into specified parent
32       * {@link Element}.
33       * 
34       * @param parent the parent {@link Element}.
35       * @param child the child {@link Element}.
36       * @throws NullPointerException if parent or child {@link Element} is
37       *         <code>null</code>.
38       */
39      @Override
40      public void add(final Element parent, final Element child) {
41          if (parent == null)
42              throw new NullPointerException("Parent cannot be null.");
43          if (child == null)
44              throw new NullPointerException("Child cannot be null.");
45  
46          parent.appendChild(child);
47      }
48  }