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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.event.xml;
19  
20  import org.w3c.dom.Element;
21  import at.ac.tuwien.infosys.sm4all.copal.api.event.ContextEvent;
22  import at.ac.tuwien.infosys.sm4all.copal.api.util.FailedUnmarshallingException;
23  import at.ac.tuwien.infosys.sm4all.copal.api.util.InvalidFieldValueException;
24  
25  /**
26   * The COPAL element for the event's source ID,
27   * 
28   * @author sanjin
29   */
30  public class SourceID extends ConcreteElement<String> {
31  
32      @Override
33      protected String retrieve(final Element element) throws FailedUnmarshallingException {
34          if (element == null)
35              throw new NullPointerException("XML DOM element cannot be null.");
36  
37          final String result = element.getTextContent().trim();
38          if (result.isEmpty())
39              throw new InvalidFieldValueException("Source ID is empty or blank.");
40  
41          return result;
42      }
43  
44      @Override
45      public void update(final Element element, final ContextEvent event) {
46          if (element == null)
47              throw new NullPointerException("XML DOM element cannot be null.");
48          if (event == null)
49              throw new NullPointerException("Context event cannot be null.");
50  
51          element.setTextContent(event.getSourceID());
52      }
53  
54      /**
55       * Singleton instance.
56       */
57      public static final SourceID INSTANCE = new SourceID();
58  
59      private SourceID() {
60          super(String.class);
61      }
62  }